bgw model 750b test report
TRANSCRIPT
SYSTEMS
13130 S Yukon Avenue Hawtnorne CA 90250 (213) 973-8090 Telex 66-4494
MODEL 750 BL~ST REPORT
DATE ( 17 - ~~ TECHNICIAN ------~~~~----~~ ----~--~~---------
SERIAL NO 8 1-]) t q t LINE VOLTAGE 110
Power ~t c~~p (01 THD) Chl Ch2 8 ohos - volts out
Power +t~dv 458 v ~6f~ 262vv
Power a~ clip (01 TRD) ~ ohms - volts out 4~(Dv
Powe 4L3v q4D~
TBD 225 watts - 8 ohms i 4 7vJ (425 volts)
20 Hz 2 0 Y~iz
TRD Mono - 8 ohms 720 watts (16 volts)
Small Signal Bandwidth
-3 dB Fequency
Noise Level Output Noise Voltage 20 Hz to 20 kHz b2- MV MV
Quiescen~ Power Watts 1liD
00500-1
shySYSTEMS
13130 SOUTH YUKON AVENUE HAWTHORNE CALIFORNIA 90250
PHONE (213) 973-6090 TELEX NO 66-4494
OWNERS MANUAL
MODELS 750B amp 750C
PROFESSIONAL POWER AMPLIFIER
T ABLE OF CONTENTS
DESCRIPTION FORM NUMBER
Title Page bull bull bull bull bull bull ltI bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull 00500
Important 00601
Description 01601
Indicator and Protection Circuits 01611
Specifica tions 02100
Unpacking and Set-Up 02600
Rack Mounting Hints 02650
Stereo Input Connections 03002
Balanced Line Inputs bull 03011
Unbalanced Line Inputs 03021
Balanced Line Input 03031
Unbalanced Line Input 03041
Terminating Resistance Chart 03051
Stereo Output Connections 03501
Damping Factor Nomagraph bull 03510
Speaker Fuse Nomagraph 03530
Mono Operation 03650
Power Mains Connection 04000
00500-2
Operation 05100
750 BC Circuit Description 06200
Chassis Schematic 07302
Parts List Chassis 07350
Amplifier Schematic 07211
Parts List Amplifier Module bull 07220
VU Meter Schematic 07104
Parts List VU Meter bull 07501
Relay Card Schematic 08304
Parts List Relay 08340
Power Mains Voltage Conversion 04601
Warranty 17010
Service Authorization Form 17020
Warranty Registration Form 17030
00601-1
- IMPORTANTshy
PLEASE READ THIS PAGE BEFORE OPERATING
YOUR
BGW POWER AMPLIFIER
Your new BG W amplifier is designed to provide years of trouble free performance Observing these few precautions will insure proper operation
Read all Instructions before connecting any AC power to your power am plifier
Retain this Manual for future reference
Heed al1 warnings on the top or rear of the power amplifier
The amplifier should not be used near water - for example near a bathtub washbowl kitchen sink laundry tub in a wet basement or near a swimming pool etc
The amplifier should be situated so that its location or position does not interfere with its proper ventilation For example it should not be situated on a bed sofa rug or similar surface that may block the ventilation openings or placed in a built-in instal1ation such as a bookcase or cabinet that may impede the flow of air through the ventilation openings
The amplifier should be situated away from heat sources such as radiators heat registers stoves or other appliances that produce heat
The amplifier should be connected to a power supply only of the type described in the operating instructions or as marked on the rear panel
Precautions that should be taken so that the grounding means of the amplifier is not defeated
The power supply cord should be routed so that it is not likely to be walked on or pinched by items placed upon or against it paying particular attention to cord at the plug convenience receptacles and the point where they exit from the amplifier
Care should be taken so that objects do not fal1 into and liquids are not spilled into the amplifier through openings
00601-2
The amplifier should be serviced by qualified service personnel when
The power supply cord or the plug has been damaged or objects have fallen into or liquid has been spilled into the amplifier or has been exposed to rain or does not appear to operate normally or exhibits a marked change in performance or has been dropped or the enclosure has been damaged
All connections should be made to the power amplifier with the power OFF
Speaker fuses should be used to afford maximum speaker protection
Never connect the output of one channel to that of another
Connect the power cord to the proper voltage mains as indicated on the rear of the amplifier Conversion to another voltage requires internal rewiring
Do not remove the amplifiers cover Amplifiers may not be covered under warranty if they are tampered with There are NO adjustments within Potentially lethal voltages exist wi thin the amplifier Refer all service work to an authorized BGW service station
01601
DESCRIPTION
The BG W 750B and 750C are professional high power stereo amplifiers identical except for their front panel indicator lights Clipping indicators are used on the 750C while the 750B uses dual solid state VU meters (see section 01611)
An onoff circuit-breaker switch gain controls and the indicator lights are located on the front panel Input output and ground connectors as well as the stereomono and meter switches are on the rear panel
Three-pin XLR type plugs can be used for balanced and unbalanced line input connections A jumper plug must be inserted into the transformer socket when unbalanced lines are used and a transformer is required for balanced lines Standard Yt phone jacks are provided for unbalanced line use only and can be used directly (see all input connection sections)
Output connections are made to five-way binding posts that accept banana plugs spade lugs or bare wire Seventy volt distribution lines can be driven directly when the amplifiers are switched to their bridged mono mode Signal ground can be separated from chassis ground if desired by removing the connecting link on the rear panel barrier strip
Features include an error-sensing op-amp input stage to stabilize performance a heat sink mounted bias circuit to provide precise temperature compensation and a full-complementary output stage featuring ten 150 watt transistors in each channel (3000 watt total dissipation capability) Extensive circuitry is used to protect the amplifiers and components connected to them (See section 01611)
Mechanical features include a 16 gauge welded steel chassis wiring massive aluminum heat sinks and modular construction
All active audio components are contained in two modules one for each channel Each consists of a glass epoxy circuit board mechanically coupled to a large aluminum heat sink Thermostat-controlled forced air cooling maintains the modules at a safe operating level Removal of the modules for service is easily accomplished by removing the support screws and the plug-in electrical connectors
Meter switch for 750B only
01611
INDICA TOR AND PROTECTION CIRCUITS
INDICA TOR CIRCUITS
The LEDs located above the gain controls on the 750C front panel serve as clipping indicators They are activated when the amplifier output level (peak) equals the power supply voltage Distortion rises significantly when this occurs because there is not enough energy available to accurately reproduce the signal As this condition can occur at a rate too fast for the eye to follow the LEDs remain lit for Y4 second once clipping is sensed A third red LED is employed as a power on indica tor
Each of the two solid-state YU meters on the 750B features eleven LEDs arranged in an arc The first LED position (left) is a power on indicator The following nine LEDs are calibrated in decibels below rated power with the far right LED indicating 0 dB and the balance ranging downward to -33dB A switch on the rear panel calibrates the meter for four or eight ohm loads This display accurate to + I dB has a response many times faster than the best conventional DArsonval meters and is also more precise The last LED is the same indic~ used in the 750C circuit The meter is protected by a high impact Lexan I
window that resists scratching and color degradation
PROTECTION CIRCUITS
In your unit both the primary mains (ac line) overload protection and the onoff switch have been combined into a rocker-actuated magnetic circuit breaker whose operation unlike fuses is predictable and independent of temperature Returning the switch to the on position resets the system
Speaker protection is provided by relay circuitry that disconnects the load whenever a short-circuit or harmful dc current is present across the output terminals Transients created when removing extremely large signals from the load are suppressed by magnetic-field arc-interruptors mounted on the relay case
The relay circuit includes a time delay that allows the amplifier to stabilize before the speakers are connected It also disconnects the speakers the instant the circuit breaker is shut off eliminating annoying pops and clicks
Thermal-sensing switches increase fan-speed when temperature rises significantly Should the temperature in either output circuit rise beyond a safe level another set of switches will disconnect the load from the amplifier until the amplifier temperature drops to a safe operating level
02100-1
SPECIFICATIONS BGW MODELS 750B and 750C
OUTPUT POWER
225 watts minimum sine wave continuous average power output per channel with both channels driving 8-ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-millwatts to 225 watts shall be no more than 01
1 kHz Power 240 watts into 8-ohms per channel both channels operating 01 Total Harmonic Distortion
360 watts minimum sine wave continuous average power output per channel with both channels driving 4--ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 360 watts shall be no more than 02
1kHz Power 4-00 watts into 4-ohms per channel both channels operating 02 Total Harmonic Distortion
720 watts minimum sine wave continuous average power output monaural driving an 8-ohm load over a power band from 20Hz to 20 kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 720 watts shall be no more than 02
1kHz Power 800 watts into 8-ohms 02 Total Harmonic Distortion
All specifications apply to both the Model 750B and Model 750C
All specifications and features are subject to change without notice
02100-2
Intermodulation Distortion
Small Signal Frequency Response
Hum and Noise Level
Input Sensitivity
Input Impedance
Damping Factor
Output Impedance
Power Requirements
Semiconductor Complement
Dimensions
Weight
SPECIFICATIONS
Less than 002 from 250 milliwatts to rated power
+0 -3dB 1Hz to 90kHz +0-025dB 20Hz to 20kHz
Better than 106dB below 225 watts (unweighted 20Hz to 20kHz)
212 volts for maxi mum power output Voltage gain 26dB (20 times)
Greater than 15k ohms
Greater than 230 to 1 referenced to 8-ohms 1kHz
Designed for any load impedance equal to or greater than 35 ohms
Interchangeable for either 100 120 200 220 or 240 volts AC 50-60Hz 1500 watts
750C 2 Op Amp ICs (equivalent to 44 transistors each) 51 transistors 8 zener diodes 21 diodes 750B Additional 2 LED driver ICs Quad Op-Amp IC 4 transistors 1 zener diode 6 diodes 19 LEDs
7-inch by 19-inch standard rack front panel by 12 inches deep U778cm x 4826cm x 3048cm)
57 Ibs(259kg) net 63 lbs (286kg) shipping
All specifications apply to both the Model 750B and Model 750e
All specifications and features are subject to change without notice
02600
UNPACKING AND SET-UP
Your BGW Power Amplifier is shipped in an advanced packing container
SA VE THE CONTAINER
AND ALL PACKING MATERIAL
The containers should be saved in the event the unit is moved or shipped at some future date Replacement containers are available from BGW for $1400 freight included
Inspect the unit for damage in transit immediately upon receipt If damage is found notify the transportation company immediately Only the consignee may institute a claim with the carrier for shipping damage BGW will cooperate fully in such event Be sure to save the container as evidence of damage for the shipper to inspect
Your BGW Power Amplifier is designed for table-top or rack mounting Since air is drawn into the amplifier at the rear and exhausted through the vents in the sides sufficient airflow must be provided Inadequate ventilation may cause the protective heat sensors to shut one or both channels off The four rubber feet may be removed if units are to be stacked one above the other in a standard relay rack
DO NOT PLUG THE AMPLIFIER
IN YET
All connections should be made before power is applied
02650
RACK MOUNTING HINTS
KEEPING IT COOL
A power amplifier draws energy from a primary electrical service usually a 120 VAC outlet to drive loudspeaker systems with an audio signal Typically only half of the energy can be delivered to the loudspeakers remaining energy is converted into heat and must be dissipated (ventilated) into the air
Air circulating past heat-producing components absorbs the heat and carries it away To accomplish this low and medium power amplifiers rely on natural convection currents while most high power amplifiers use fans If the air flow is impeded the resulting rise in heat may cause an amplifier to stop working or fail
Circulating air currents must not be cut off when installing power amplifiers in racks Power amplifiers using convection cooling require spacing between amplifiers to permit air flow between them Power amplifiers using forced-air cooling on the other hand can usually be stacked closer to each other and may not need any blank panel spacing between amplifiers
To improve natural convection currents within a rack a chimney can be created by closing the back of the rack and venting the rack at the bottom to let in fresh air and at the top to exhaust hot air Vents should be large rectangular slots approximately 19 wide by lj high
The rack cabinet will require some type of blower if a large air-flow is required It is best to exhaust air from the top of the rack rather than to blow it in from the bottom There will be less dust and dirt in the rack this way if the bottom vent is sufficiently large
INST ALLING THE UNITS
Use care when mounting equipment in a rack Place the heaviest units near the bottom of the rack and fill in all unused rack spaces with blank panels Equipment cannot always be supported by front panels alone This is especially true of amplifiers whose depth is more than twice their height Uniform support can be insured by installing bottom or side rails
When racks are to be transported or used in a mobile installation some means of securing the rear of the equipment are required Angle brackets either attached to the bottom side rails or rear panel are practical approaches
03002-1
STEREO INPUT CONNECTIONS
Three-pin XLR and y in phone jacks are provided on the rear of the amplifier for input connections Balanced or unbalanced lines may be used however if input cables are longer than 8 feet balanced lines may be necessary to maintain the signal-to-noise ratio and high frequency response
14 INCH PHONE JACKS The 14 phone jacks are for unbalanced lines only (single conductor shielded) and may be used directly Simply connect the shield to the outer sleeve of the plug and the inner conductor to the tip or buy ready-made cables See diagram below
CONNECT SHIELD HE~RL 10JJ ~ = t
CONNECT INNECOOUCTOR HERE SLEEVE TIP
3-PIN XLR CONNECTORS The 3-pin XLR connectors may be used with balanced (2-conductor shielded) or unbalanced lines They are connected to the amplifiers inputs by using the 8-pin transformer socket they cannot be used directly
Unbalanced Lines To use the 3-pin XLR connectors with unbalanced lines a jumper plug (BGW PIN 1350-0108) must be inserted into each transformer socket The jumper plug connects pin 111 to pin 117 and pin 116 to pin 118 as shown
- -- ----
JUMPER PLUG MUST BE USED WITH UNBALANCED LINES
With the jumper plug in place the 3-pin XLR connector has pin 112 connected to ground and pin 113 to the input of the amplifier Note Rear of plug shown
When using single conductor shielded cable for unbalanced lines connect the inner conductor to pin 113 and the shield to pins 111 amp 112
J--~ When using 2-conductor shielded cable for unbalanced lines connect the high level signal wire to pin 113 the low level signal wire to pin 112 and the shield to pin 111
Note Shield not connected to anything at signal sourcejJ-~
03002-2
To achieve a true balanced input it is necessary to use one transformer for each input These should be plugged into the octal sockets provided Depending on the specific application one of several different transformers may be selected
Forms are included in this manual to help guide you in your use and selection of transformers Use the index below to find the appropriate form to match your needs
CONNECTING ON SOURCE TO ONE AMPLIFIER
Using Balanced Lines Refer to form 1103031
Using Unbalanced Lines Refer to form 1103041
CONNECTING ONE SOURCE TO TWO OR MORE AMPLIFIERS OR DEVICES
Using Balanced Lines Refer to form 1103011
Using Unbalanced Lines Refer to form 1103021
NOTE Each amplifier input will be referred to as the Load in the above mentioned forms Only one channel will be shown
Two conductor shielded cable should be used in a balanced line system Connect input cables as shown below
Pin III Shield (Ground) Pin 112 Signal (Minus) Pin 113 Signal (Plus) ~ t~~=i-~-3
FOR MONO (BRIDGED) OPERATION
To operate the unit as a mono amplifier use the left channel input only DO NOT use the right channel input Remember to place the stereomono switch in the mono position
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
bull 7
bull s
4
I
SOUICE IISISTANCE
(1
1M
4
2
bull bull 10
20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
bullbull
5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
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I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
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Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
-----4 - 10V
c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
~ I (El
LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
C I I IJ Ui- 1 5 1 D I PPE D T 1 J TAL 1)1 0221)-OU10 C~ 220Jpc I K J ~) [ S C C f rlt AI Ie 0100-1)220 CJ 5ltJIJF 1 2 V LECT0-JLfTIC Ct 5 6- 0 J 50 C J47U F 251 0lSC C~~~~[C () 12 J-O J I (
C j4UF ~lt-j l J [ iC CC~A ~ l C OIL ) - 0 ) 4 7
c) 3jPF IOUV gt10 t) I[Cl (01) J - OJ]O
C I (J 0 gt10 500V L) [-pcu 11 C A O]nO -O I JO
CJ 4(r= I K J u IC CcRAIC o t 0 l -OU 47 cJ bull J OJ )F I v DISC C~JII L OIOO-OJCl5
cia 120~F Suov OIPP2~ MICA U)iO-Ol0
C I I 2 v U~ I 0 ) 1 c L fO C T ( (J L Y rI C 04J 5 - 002ll C I 2 2 lf- I)JV F L fC T rilJLYTIC 0( j6-0(2 0 C 1 3 I ~OP F scav O[gtPEO ~[ CA 01))0 -0120 CI4 lL O~F 5uOV DI~PcD MICA 0 ) 0 -0120 CI S IUr l5v U[SC CLHAlpoundC 0 1 29-010 0 CII) 2~OJPF S00V DISC (E-A~ I C 0C) I()-2500
C17 2~OlJoF 500v D ISC C~~A~IC )0 middot 0 - 2-gt00 C I 3 IUF 100V O I P)iC) middotIYL K U 3~ )- 0 1 00
C 1 i IUI ~51 GISC c ylt ~I[C O J ) q-IJIOJ
C~O IJO ~F I KV OIC CEFH~IC Ol ()0-1000 CLI bull [ 7 J F 1 ) 0 V LJ I gt D E D ( L A Flt I () ~ C ]r q -O middotI 71
IU r=
lUi-
IJ OJ0F
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lKV J [ SC ~RA ~ I C J [ J J - 1 ) l (
C ( 1 l ( 7 4 I ) J L T L ~ r r~ 1 ) ) ) - 14 J
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CJ [ 4 I ~ 1 J [ Sd r C 1 loj C ) ) LI
C~4 l bull 4 1 4i _) I S [ T C 1 I G ) I J- co ~ J J 0 - 1 ( G
Clt) [ 1400 ) )() -4lJ ()
I ~v o A ~ ~O ) ) G I) -ij04
C ( r 1 )i) - 474J
I T t lt0 T ) c r C) [T
Ie 1
I J E )O) ) 1~ r ~ ~J cgt r T- ( [ 1 - ) I SO
J c J t J 1gt 1 r r ~ j I J T gt 1
~ G -I S Y S I L S bull bull c bull 07220-2
~ lG W f) 5~fl igt TI P A~ I 4)
OJ J E 7 2 IJ I P ~ T ~ 0 i I j r R 1 5 4-0120
0 middot ~f-S91 p r ~ AJiljT ] r~ lCjSJ- u C93
Cgt S 4 j gt I T ~ lo JC [ T lt 1 ))4 shy ] t~]
Q ) lJ 5 ~ J I ~ P ~ T ~ Al Lj I r d 1 a ~4-()U4]
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]j J E 3 4 J P ~ T ) A l J r J t-~ 1--j~ 4-J3~ J
Ci ~ J=J5 rJ i I P A middot l gt gt) 1 3~3-~)3Su
r l I 0 5J7394 rj TP JS [ T J i l 1 -3 )4-7394 () 1 1 SJ7G7 pcJ Tql ~ [jr] l 1 j ) ] - 7 0 7
Q I2 5J7J9(~ i P T~ AIJ [ j T J~ I ~J ~ -7j r 4
(H 3 SJ 7 J 7 f-lto r -J ~ JS I J T llf I ~l i ] - 7 0 1
01 SJ7j ) 1 rPi T ~lSILJ I l L 4 - ] 9 4
(1 1 SJ7~07 p~p r R ~ N~ jTJ ~ 1 ~3 1-7~()7
) I ~~ S7J 9 -+ P I R A ~J S [JI -I I ~ J4-7j9
8 7 SJ707 r middotJJ r~A Ns rgtr 1 3 5 3-74 ) 7
Cd c SJ73)4 ~ rgt T -IA IgtI ~ i JI t l 4-73 j
~) 1 ) S J 707 P ~gt I ) ltIgt I ~ T J ~ 1 ~J-740l
J () S J 7 ] 9 4 ~ ~) j T A i [ I U ltshy 1 J ) 4 - 7 J ~
~ ) I S J 7 -+ ~ 7 P Nf- T Q L I T J flt 1 ~l3-7()7
O~2 ) )J P r JA I I s T ul~ 1 3 3-lJ U
~ 3 J 5 A 4 J P I -lt l I j T J 1 1gt 4- 0 0 43 J~4 P 5 J i F j I ~ N ~ I -gt T j h 1 d J - f) r) 4 ]
- ~- ~ 1shy P_ s r s ru-( i
lt 1
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jh ~ 12 j~
1lt 1middot i 1 2 ~
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-lt J
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~ 1 ) shy H ~ ~ 1 oJ 6 i) 2 0 - 3 () 2 R 4 7 bull shy lt n I I N UOI-45~
middot 3 ~) J ri1 ~ 0 1 J ~ rl C ~ ) - 3 i 0 ~~
~ 4 7 JH 1211 5 ~ S ) u -41J2 ~ I v 0 l rl A 1 ~ gt J () fJ 5 - 1 0 ) 2shy
~ J l K 1 h l 1 ~ ~ ~~ fJ 5 -4l0J
r 1 bull 60 J-I J 12 fi -~ J bull -gt O J s -r) j i) 1
rlt L 1 lt -1- i i 1gt ~j ~ r) f] S shy 1 j 1 J
lt I 1 I c bull
1 ) lt
rJJO
4 7 1lt
J r 1 12
0 1 1 2
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gt ~
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) IJ J 5 shy
SO ( shy
1 ~ J - J - C L
I 7 f) J
P S ~ 7
1 )0
1 1 J
I) 1 ~
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1 gt
J bull
5(0 )-1002
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~ bull9 I J C i 1 5 5 ) Jc-lIJOS pJ 1 u 0 LJ r1 1 12 i gt J u -)- 1 102
~lt ~ I i 0 J --1 12 J ~ S t) V ) shy C )0 1
~ c2
C J
- _t I 0 r
-I e -
1 1 2
lt -= -1 1~ J
I
r I
5 r ~ ) -=) - I r shyc I S~ C i J r ~
lt -- shy I ~ A r r -
q~j 1 ~j ~ J ~ bullbull 1 2 1 - 0 j =-shy 1) ()4
r~t 7gtlt ] r~ 1 ~~ ( ) ~ ) f) J ~ - 7 J J
gtJ V S Y S T = S bull I 1 C bull 07220-3
E jG ~jJ D i~ Sc R r l T I ~l~ I-AH T L)
i G 7 1 J Ilt Cl ~ 1 1 2 ~ ) ~ 500S -I J0 4 ~) ~~ 1 JK 0-11 1 2 J) 50 G) -lu04J
~ ~ l 1 O~ J H 1 2 S SO ()5 -I U05 fUO 4 7 lt J ~t 1 ~ ~ S 0 00) -1 005
j 1 2 7 J r-tv 1 v 5 () J S - 7 J 2 ~J 2 2 7 lt-- J1 1 c gt00) -27) 2 r~ J J 4 bull 7 lt J 1 r 1 L I 50J 5 -4 7 O~ ( - 4 1 ) 0 0 ~ 1 211 50 5 -l u~2
~ yi 1 ) I) O~ 12 gt) 5005-1J()L lt j ) 2 bull 7 Jrl ~ 12 =s~~ t 0 2 ) - 2 J 7 0 ~J 7 2 7 G --i ~ 2 ~ gt ~ 402 ) - 2 0 7 )
f-U 1 bull J 3 (JH 5 y 1 0 40 5J - J J J 0 lt J ) bull ~ J 0 - 5 1 () ~ (~() 5) -O _)JO I J 1 01 1
5 1t1 ~ 4) 5 C - ) J ) (jbull J
~l I middot J 3 Qt-i ~-I ) 1 n ~ 4()0-0330 1 ~l 2 47JIlt -1 middot112 bull SOJl -47i 2
~~ (4- 3 bull jJ 0 I 5 1 O ~
r~ 4 middot ~3 Jri middot1 SI 1 J - 4j)O - JI30 -~ -+ -~
bull J 3 Q 1 5 1 0 -)) 0 - ~) J ) 0 ~ j3 ~1t1 1 5 f 1 O ~ 4(50-)330 ) + 7 middotJJ nd 1 5 1 O~ 4 Q - ) - () j J ) 1- 4 t3 middotjJ ]H 1 c 1 O~ (~O) J - ) 3 30
P- 2 7 01 ~ 2 S 4() ~c - 2J 70
4)t) Jj ) rl J 1 u x 4 j ) Cl- j ) () 1
-(j 1 1 bull -1lt J I iv 1 2 5 Jl J5-1 middot102
~ )2 1 -ilt J middot1 1 2middot S ~ 5 0 u 5 - 1 - 0 2 j3 1 - I) 0 I 1 2 s gtOO)-IJ02
(Jf-3~J-J4 42
J ~gt~ r) - J bull 4 t
1 L 7j1-l21
r S JLAT JQ )1-4JJL ) i_ I ~ 0 7 2 - 3j41
1=- r S I lt r ~ J 1J ~l I f)j( - ~ - l
2 LJC L l q - J I t 1 322 - )() 1 )
- lt) A 3 -gtCi - 1gt ~H lL C 4f) 211 5 - 2) 75
4 () - 1 gt ~ J rH I I ) ) H l L C ) 2 1~ C) -31 5v
Ij- J c j -( middots gtLJ T CI) 22 d~ -3u 2)
j 1 r- h J If j gt 1 J 2 - () ) r) (
b - J~ A l -t r- i L ( - jl T ~c) ~Q_ gt -~ 0
SJ t ~~ ~ bull 1 ) i bull - ~) -( bull 1 J ~ ~f~ )~- -) l tJ
T j 1
T 2 SilTCt T-i C ~ 1 lt L
MOOS -
---~~ ~ Iftl
~~ I I IDLE Fi R51S
C W I I 508 -0
o gtCo1-i~
1
Imiddot1gtt1 ~~ bull r 0 I I 1~1j8
k ~O I -- -33Z ) t B 7 C bull 000
J-Ficooi Ie j03 r-~e -4 T
o~o
0312- 2 7 shyLEFT C )0(0 Rl17If ~ c -V
=
vvvv
Oll~~t-l -2 1 - ~~00O l 0 1~W -15 y 2VRgtIIJR
~ 10I ~ 3 J -gt 1lt 1(501 W 0 ~W DI8-12 ~ ~ LM3J15 I- Q5Z 3
pound0 +15V
50
I
--F R ZtII ~fGRIEN _ 0 j Z2 lO rlt
l~1-t
j I)Luli j I R~lt
-) -J 024
tjlAlt 0 - 05eoP ~
YihD ~ o~ 1j CT F
--0H~Z OA i---- --=- CLIP - O ) 2 0
l --01- 501
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004[1gt02RIGHT RS(pA~O I~I~ 41 4J( n IK
DOlaquoshylt IH~1 e
C~2 D VA I47 ~ O~
gt0-0 ~ ~vc gt0)1 Ie 50 3 0 tshy0511- 2 7
RI1 6 D3I~ o~- 21 ~
lt igt R~obull K 14 132 I 10 ~ e e
1( 5 02 RgtJ2shy00 LM3915
(p R h
0-lt
2 - v 1 5 (1 3 o~ 70shyL 1324shy)
+v 0
CLI P D ~2~
IIIIt[J$ ~r-sl SKCV8I 8GwSVSTEMS 13130 SC1I1HYUj(ON AVE
1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
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DIODES ANO lENERS
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TRANSISTURS
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= ~ESIiTORS
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RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
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04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
00500-1
shySYSTEMS
13130 SOUTH YUKON AVENUE HAWTHORNE CALIFORNIA 90250
PHONE (213) 973-6090 TELEX NO 66-4494
OWNERS MANUAL
MODELS 750B amp 750C
PROFESSIONAL POWER AMPLIFIER
T ABLE OF CONTENTS
DESCRIPTION FORM NUMBER
Title Page bull bull bull bull bull bull ltI bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull bull 00500
Important 00601
Description 01601
Indicator and Protection Circuits 01611
Specifica tions 02100
Unpacking and Set-Up 02600
Rack Mounting Hints 02650
Stereo Input Connections 03002
Balanced Line Inputs bull 03011
Unbalanced Line Inputs 03021
Balanced Line Input 03031
Unbalanced Line Input 03041
Terminating Resistance Chart 03051
Stereo Output Connections 03501
Damping Factor Nomagraph bull 03510
Speaker Fuse Nomagraph 03530
Mono Operation 03650
Power Mains Connection 04000
00500-2
Operation 05100
750 BC Circuit Description 06200
Chassis Schematic 07302
Parts List Chassis 07350
Amplifier Schematic 07211
Parts List Amplifier Module bull 07220
VU Meter Schematic 07104
Parts List VU Meter bull 07501
Relay Card Schematic 08304
Parts List Relay 08340
Power Mains Voltage Conversion 04601
Warranty 17010
Service Authorization Form 17020
Warranty Registration Form 17030
00601-1
- IMPORTANTshy
PLEASE READ THIS PAGE BEFORE OPERATING
YOUR
BGW POWER AMPLIFIER
Your new BG W amplifier is designed to provide years of trouble free performance Observing these few precautions will insure proper operation
Read all Instructions before connecting any AC power to your power am plifier
Retain this Manual for future reference
Heed al1 warnings on the top or rear of the power amplifier
The amplifier should not be used near water - for example near a bathtub washbowl kitchen sink laundry tub in a wet basement or near a swimming pool etc
The amplifier should be situated so that its location or position does not interfere with its proper ventilation For example it should not be situated on a bed sofa rug or similar surface that may block the ventilation openings or placed in a built-in instal1ation such as a bookcase or cabinet that may impede the flow of air through the ventilation openings
The amplifier should be situated away from heat sources such as radiators heat registers stoves or other appliances that produce heat
The amplifier should be connected to a power supply only of the type described in the operating instructions or as marked on the rear panel
Precautions that should be taken so that the grounding means of the amplifier is not defeated
The power supply cord should be routed so that it is not likely to be walked on or pinched by items placed upon or against it paying particular attention to cord at the plug convenience receptacles and the point where they exit from the amplifier
Care should be taken so that objects do not fal1 into and liquids are not spilled into the amplifier through openings
00601-2
The amplifier should be serviced by qualified service personnel when
The power supply cord or the plug has been damaged or objects have fallen into or liquid has been spilled into the amplifier or has been exposed to rain or does not appear to operate normally or exhibits a marked change in performance or has been dropped or the enclosure has been damaged
All connections should be made to the power amplifier with the power OFF
Speaker fuses should be used to afford maximum speaker protection
Never connect the output of one channel to that of another
Connect the power cord to the proper voltage mains as indicated on the rear of the amplifier Conversion to another voltage requires internal rewiring
Do not remove the amplifiers cover Amplifiers may not be covered under warranty if they are tampered with There are NO adjustments within Potentially lethal voltages exist wi thin the amplifier Refer all service work to an authorized BGW service station
01601
DESCRIPTION
The BG W 750B and 750C are professional high power stereo amplifiers identical except for their front panel indicator lights Clipping indicators are used on the 750C while the 750B uses dual solid state VU meters (see section 01611)
An onoff circuit-breaker switch gain controls and the indicator lights are located on the front panel Input output and ground connectors as well as the stereomono and meter switches are on the rear panel
Three-pin XLR type plugs can be used for balanced and unbalanced line input connections A jumper plug must be inserted into the transformer socket when unbalanced lines are used and a transformer is required for balanced lines Standard Yt phone jacks are provided for unbalanced line use only and can be used directly (see all input connection sections)
Output connections are made to five-way binding posts that accept banana plugs spade lugs or bare wire Seventy volt distribution lines can be driven directly when the amplifiers are switched to their bridged mono mode Signal ground can be separated from chassis ground if desired by removing the connecting link on the rear panel barrier strip
Features include an error-sensing op-amp input stage to stabilize performance a heat sink mounted bias circuit to provide precise temperature compensation and a full-complementary output stage featuring ten 150 watt transistors in each channel (3000 watt total dissipation capability) Extensive circuitry is used to protect the amplifiers and components connected to them (See section 01611)
Mechanical features include a 16 gauge welded steel chassis wiring massive aluminum heat sinks and modular construction
All active audio components are contained in two modules one for each channel Each consists of a glass epoxy circuit board mechanically coupled to a large aluminum heat sink Thermostat-controlled forced air cooling maintains the modules at a safe operating level Removal of the modules for service is easily accomplished by removing the support screws and the plug-in electrical connectors
Meter switch for 750B only
01611
INDICA TOR AND PROTECTION CIRCUITS
INDICA TOR CIRCUITS
The LEDs located above the gain controls on the 750C front panel serve as clipping indicators They are activated when the amplifier output level (peak) equals the power supply voltage Distortion rises significantly when this occurs because there is not enough energy available to accurately reproduce the signal As this condition can occur at a rate too fast for the eye to follow the LEDs remain lit for Y4 second once clipping is sensed A third red LED is employed as a power on indica tor
Each of the two solid-state YU meters on the 750B features eleven LEDs arranged in an arc The first LED position (left) is a power on indicator The following nine LEDs are calibrated in decibels below rated power with the far right LED indicating 0 dB and the balance ranging downward to -33dB A switch on the rear panel calibrates the meter for four or eight ohm loads This display accurate to + I dB has a response many times faster than the best conventional DArsonval meters and is also more precise The last LED is the same indic~ used in the 750C circuit The meter is protected by a high impact Lexan I
window that resists scratching and color degradation
PROTECTION CIRCUITS
In your unit both the primary mains (ac line) overload protection and the onoff switch have been combined into a rocker-actuated magnetic circuit breaker whose operation unlike fuses is predictable and independent of temperature Returning the switch to the on position resets the system
Speaker protection is provided by relay circuitry that disconnects the load whenever a short-circuit or harmful dc current is present across the output terminals Transients created when removing extremely large signals from the load are suppressed by magnetic-field arc-interruptors mounted on the relay case
The relay circuit includes a time delay that allows the amplifier to stabilize before the speakers are connected It also disconnects the speakers the instant the circuit breaker is shut off eliminating annoying pops and clicks
Thermal-sensing switches increase fan-speed when temperature rises significantly Should the temperature in either output circuit rise beyond a safe level another set of switches will disconnect the load from the amplifier until the amplifier temperature drops to a safe operating level
02100-1
SPECIFICATIONS BGW MODELS 750B and 750C
OUTPUT POWER
225 watts minimum sine wave continuous average power output per channel with both channels driving 8-ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-millwatts to 225 watts shall be no more than 01
1 kHz Power 240 watts into 8-ohms per channel both channels operating 01 Total Harmonic Distortion
360 watts minimum sine wave continuous average power output per channel with both channels driving 4--ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 360 watts shall be no more than 02
1kHz Power 4-00 watts into 4-ohms per channel both channels operating 02 Total Harmonic Distortion
720 watts minimum sine wave continuous average power output monaural driving an 8-ohm load over a power band from 20Hz to 20 kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 720 watts shall be no more than 02
1kHz Power 800 watts into 8-ohms 02 Total Harmonic Distortion
All specifications apply to both the Model 750B and Model 750C
All specifications and features are subject to change without notice
02100-2
Intermodulation Distortion
Small Signal Frequency Response
Hum and Noise Level
Input Sensitivity
Input Impedance
Damping Factor
Output Impedance
Power Requirements
Semiconductor Complement
Dimensions
Weight
SPECIFICATIONS
Less than 002 from 250 milliwatts to rated power
+0 -3dB 1Hz to 90kHz +0-025dB 20Hz to 20kHz
Better than 106dB below 225 watts (unweighted 20Hz to 20kHz)
212 volts for maxi mum power output Voltage gain 26dB (20 times)
Greater than 15k ohms
Greater than 230 to 1 referenced to 8-ohms 1kHz
Designed for any load impedance equal to or greater than 35 ohms
Interchangeable for either 100 120 200 220 or 240 volts AC 50-60Hz 1500 watts
750C 2 Op Amp ICs (equivalent to 44 transistors each) 51 transistors 8 zener diodes 21 diodes 750B Additional 2 LED driver ICs Quad Op-Amp IC 4 transistors 1 zener diode 6 diodes 19 LEDs
7-inch by 19-inch standard rack front panel by 12 inches deep U778cm x 4826cm x 3048cm)
57 Ibs(259kg) net 63 lbs (286kg) shipping
All specifications apply to both the Model 750B and Model 750e
All specifications and features are subject to change without notice
02600
UNPACKING AND SET-UP
Your BGW Power Amplifier is shipped in an advanced packing container
SA VE THE CONTAINER
AND ALL PACKING MATERIAL
The containers should be saved in the event the unit is moved or shipped at some future date Replacement containers are available from BGW for $1400 freight included
Inspect the unit for damage in transit immediately upon receipt If damage is found notify the transportation company immediately Only the consignee may institute a claim with the carrier for shipping damage BGW will cooperate fully in such event Be sure to save the container as evidence of damage for the shipper to inspect
Your BGW Power Amplifier is designed for table-top or rack mounting Since air is drawn into the amplifier at the rear and exhausted through the vents in the sides sufficient airflow must be provided Inadequate ventilation may cause the protective heat sensors to shut one or both channels off The four rubber feet may be removed if units are to be stacked one above the other in a standard relay rack
DO NOT PLUG THE AMPLIFIER
IN YET
All connections should be made before power is applied
02650
RACK MOUNTING HINTS
KEEPING IT COOL
A power amplifier draws energy from a primary electrical service usually a 120 VAC outlet to drive loudspeaker systems with an audio signal Typically only half of the energy can be delivered to the loudspeakers remaining energy is converted into heat and must be dissipated (ventilated) into the air
Air circulating past heat-producing components absorbs the heat and carries it away To accomplish this low and medium power amplifiers rely on natural convection currents while most high power amplifiers use fans If the air flow is impeded the resulting rise in heat may cause an amplifier to stop working or fail
Circulating air currents must not be cut off when installing power amplifiers in racks Power amplifiers using convection cooling require spacing between amplifiers to permit air flow between them Power amplifiers using forced-air cooling on the other hand can usually be stacked closer to each other and may not need any blank panel spacing between amplifiers
To improve natural convection currents within a rack a chimney can be created by closing the back of the rack and venting the rack at the bottom to let in fresh air and at the top to exhaust hot air Vents should be large rectangular slots approximately 19 wide by lj high
The rack cabinet will require some type of blower if a large air-flow is required It is best to exhaust air from the top of the rack rather than to blow it in from the bottom There will be less dust and dirt in the rack this way if the bottom vent is sufficiently large
INST ALLING THE UNITS
Use care when mounting equipment in a rack Place the heaviest units near the bottom of the rack and fill in all unused rack spaces with blank panels Equipment cannot always be supported by front panels alone This is especially true of amplifiers whose depth is more than twice their height Uniform support can be insured by installing bottom or side rails
When racks are to be transported or used in a mobile installation some means of securing the rear of the equipment are required Angle brackets either attached to the bottom side rails or rear panel are practical approaches
03002-1
STEREO INPUT CONNECTIONS
Three-pin XLR and y in phone jacks are provided on the rear of the amplifier for input connections Balanced or unbalanced lines may be used however if input cables are longer than 8 feet balanced lines may be necessary to maintain the signal-to-noise ratio and high frequency response
14 INCH PHONE JACKS The 14 phone jacks are for unbalanced lines only (single conductor shielded) and may be used directly Simply connect the shield to the outer sleeve of the plug and the inner conductor to the tip or buy ready-made cables See diagram below
CONNECT SHIELD HE~RL 10JJ ~ = t
CONNECT INNECOOUCTOR HERE SLEEVE TIP
3-PIN XLR CONNECTORS The 3-pin XLR connectors may be used with balanced (2-conductor shielded) or unbalanced lines They are connected to the amplifiers inputs by using the 8-pin transformer socket they cannot be used directly
Unbalanced Lines To use the 3-pin XLR connectors with unbalanced lines a jumper plug (BGW PIN 1350-0108) must be inserted into each transformer socket The jumper plug connects pin 111 to pin 117 and pin 116 to pin 118 as shown
- -- ----
JUMPER PLUG MUST BE USED WITH UNBALANCED LINES
With the jumper plug in place the 3-pin XLR connector has pin 112 connected to ground and pin 113 to the input of the amplifier Note Rear of plug shown
When using single conductor shielded cable for unbalanced lines connect the inner conductor to pin 113 and the shield to pins 111 amp 112
J--~ When using 2-conductor shielded cable for unbalanced lines connect the high level signal wire to pin 113 the low level signal wire to pin 112 and the shield to pin 111
Note Shield not connected to anything at signal sourcejJ-~
03002-2
To achieve a true balanced input it is necessary to use one transformer for each input These should be plugged into the octal sockets provided Depending on the specific application one of several different transformers may be selected
Forms are included in this manual to help guide you in your use and selection of transformers Use the index below to find the appropriate form to match your needs
CONNECTING ON SOURCE TO ONE AMPLIFIER
Using Balanced Lines Refer to form 1103031
Using Unbalanced Lines Refer to form 1103041
CONNECTING ONE SOURCE TO TWO OR MORE AMPLIFIERS OR DEVICES
Using Balanced Lines Refer to form 1103011
Using Unbalanced Lines Refer to form 1103021
NOTE Each amplifier input will be referred to as the Load in the above mentioned forms Only one channel will be shown
Two conductor shielded cable should be used in a balanced line system Connect input cables as shown below
Pin III Shield (Ground) Pin 112 Signal (Minus) Pin 113 Signal (Plus) ~ t~~=i-~-3
FOR MONO (BRIDGED) OPERATION
To operate the unit as a mono amplifier use the left channel input only DO NOT use the right channel input Remember to place the stereomono switch in the mono position
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
bull 7
bull s
4
I
SOUICE IISISTANCE
(1
1M
4
2
bull bull 10
20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
bullbull
5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
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2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
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AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
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T~o 1 12
-
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4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
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o MFRM - 07211 IIDI ON f
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=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
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DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
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D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
00500-2
Operation 05100
750 BC Circuit Description 06200
Chassis Schematic 07302
Parts List Chassis 07350
Amplifier Schematic 07211
Parts List Amplifier Module bull 07220
VU Meter Schematic 07104
Parts List VU Meter bull 07501
Relay Card Schematic 08304
Parts List Relay 08340
Power Mains Voltage Conversion 04601
Warranty 17010
Service Authorization Form 17020
Warranty Registration Form 17030
00601-1
- IMPORTANTshy
PLEASE READ THIS PAGE BEFORE OPERATING
YOUR
BGW POWER AMPLIFIER
Your new BG W amplifier is designed to provide years of trouble free performance Observing these few precautions will insure proper operation
Read all Instructions before connecting any AC power to your power am plifier
Retain this Manual for future reference
Heed al1 warnings on the top or rear of the power amplifier
The amplifier should not be used near water - for example near a bathtub washbowl kitchen sink laundry tub in a wet basement or near a swimming pool etc
The amplifier should be situated so that its location or position does not interfere with its proper ventilation For example it should not be situated on a bed sofa rug or similar surface that may block the ventilation openings or placed in a built-in instal1ation such as a bookcase or cabinet that may impede the flow of air through the ventilation openings
The amplifier should be situated away from heat sources such as radiators heat registers stoves or other appliances that produce heat
The amplifier should be connected to a power supply only of the type described in the operating instructions or as marked on the rear panel
Precautions that should be taken so that the grounding means of the amplifier is not defeated
The power supply cord should be routed so that it is not likely to be walked on or pinched by items placed upon or against it paying particular attention to cord at the plug convenience receptacles and the point where they exit from the amplifier
Care should be taken so that objects do not fal1 into and liquids are not spilled into the amplifier through openings
00601-2
The amplifier should be serviced by qualified service personnel when
The power supply cord or the plug has been damaged or objects have fallen into or liquid has been spilled into the amplifier or has been exposed to rain or does not appear to operate normally or exhibits a marked change in performance or has been dropped or the enclosure has been damaged
All connections should be made to the power amplifier with the power OFF
Speaker fuses should be used to afford maximum speaker protection
Never connect the output of one channel to that of another
Connect the power cord to the proper voltage mains as indicated on the rear of the amplifier Conversion to another voltage requires internal rewiring
Do not remove the amplifiers cover Amplifiers may not be covered under warranty if they are tampered with There are NO adjustments within Potentially lethal voltages exist wi thin the amplifier Refer all service work to an authorized BGW service station
01601
DESCRIPTION
The BG W 750B and 750C are professional high power stereo amplifiers identical except for their front panel indicator lights Clipping indicators are used on the 750C while the 750B uses dual solid state VU meters (see section 01611)
An onoff circuit-breaker switch gain controls and the indicator lights are located on the front panel Input output and ground connectors as well as the stereomono and meter switches are on the rear panel
Three-pin XLR type plugs can be used for balanced and unbalanced line input connections A jumper plug must be inserted into the transformer socket when unbalanced lines are used and a transformer is required for balanced lines Standard Yt phone jacks are provided for unbalanced line use only and can be used directly (see all input connection sections)
Output connections are made to five-way binding posts that accept banana plugs spade lugs or bare wire Seventy volt distribution lines can be driven directly when the amplifiers are switched to their bridged mono mode Signal ground can be separated from chassis ground if desired by removing the connecting link on the rear panel barrier strip
Features include an error-sensing op-amp input stage to stabilize performance a heat sink mounted bias circuit to provide precise temperature compensation and a full-complementary output stage featuring ten 150 watt transistors in each channel (3000 watt total dissipation capability) Extensive circuitry is used to protect the amplifiers and components connected to them (See section 01611)
Mechanical features include a 16 gauge welded steel chassis wiring massive aluminum heat sinks and modular construction
All active audio components are contained in two modules one for each channel Each consists of a glass epoxy circuit board mechanically coupled to a large aluminum heat sink Thermostat-controlled forced air cooling maintains the modules at a safe operating level Removal of the modules for service is easily accomplished by removing the support screws and the plug-in electrical connectors
Meter switch for 750B only
01611
INDICA TOR AND PROTECTION CIRCUITS
INDICA TOR CIRCUITS
The LEDs located above the gain controls on the 750C front panel serve as clipping indicators They are activated when the amplifier output level (peak) equals the power supply voltage Distortion rises significantly when this occurs because there is not enough energy available to accurately reproduce the signal As this condition can occur at a rate too fast for the eye to follow the LEDs remain lit for Y4 second once clipping is sensed A third red LED is employed as a power on indica tor
Each of the two solid-state YU meters on the 750B features eleven LEDs arranged in an arc The first LED position (left) is a power on indicator The following nine LEDs are calibrated in decibels below rated power with the far right LED indicating 0 dB and the balance ranging downward to -33dB A switch on the rear panel calibrates the meter for four or eight ohm loads This display accurate to + I dB has a response many times faster than the best conventional DArsonval meters and is also more precise The last LED is the same indic~ used in the 750C circuit The meter is protected by a high impact Lexan I
window that resists scratching and color degradation
PROTECTION CIRCUITS
In your unit both the primary mains (ac line) overload protection and the onoff switch have been combined into a rocker-actuated magnetic circuit breaker whose operation unlike fuses is predictable and independent of temperature Returning the switch to the on position resets the system
Speaker protection is provided by relay circuitry that disconnects the load whenever a short-circuit or harmful dc current is present across the output terminals Transients created when removing extremely large signals from the load are suppressed by magnetic-field arc-interruptors mounted on the relay case
The relay circuit includes a time delay that allows the amplifier to stabilize before the speakers are connected It also disconnects the speakers the instant the circuit breaker is shut off eliminating annoying pops and clicks
Thermal-sensing switches increase fan-speed when temperature rises significantly Should the temperature in either output circuit rise beyond a safe level another set of switches will disconnect the load from the amplifier until the amplifier temperature drops to a safe operating level
02100-1
SPECIFICATIONS BGW MODELS 750B and 750C
OUTPUT POWER
225 watts minimum sine wave continuous average power output per channel with both channels driving 8-ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-millwatts to 225 watts shall be no more than 01
1 kHz Power 240 watts into 8-ohms per channel both channels operating 01 Total Harmonic Distortion
360 watts minimum sine wave continuous average power output per channel with both channels driving 4--ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 360 watts shall be no more than 02
1kHz Power 4-00 watts into 4-ohms per channel both channels operating 02 Total Harmonic Distortion
720 watts minimum sine wave continuous average power output monaural driving an 8-ohm load over a power band from 20Hz to 20 kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 720 watts shall be no more than 02
1kHz Power 800 watts into 8-ohms 02 Total Harmonic Distortion
All specifications apply to both the Model 750B and Model 750C
All specifications and features are subject to change without notice
02100-2
Intermodulation Distortion
Small Signal Frequency Response
Hum and Noise Level
Input Sensitivity
Input Impedance
Damping Factor
Output Impedance
Power Requirements
Semiconductor Complement
Dimensions
Weight
SPECIFICATIONS
Less than 002 from 250 milliwatts to rated power
+0 -3dB 1Hz to 90kHz +0-025dB 20Hz to 20kHz
Better than 106dB below 225 watts (unweighted 20Hz to 20kHz)
212 volts for maxi mum power output Voltage gain 26dB (20 times)
Greater than 15k ohms
Greater than 230 to 1 referenced to 8-ohms 1kHz
Designed for any load impedance equal to or greater than 35 ohms
Interchangeable for either 100 120 200 220 or 240 volts AC 50-60Hz 1500 watts
750C 2 Op Amp ICs (equivalent to 44 transistors each) 51 transistors 8 zener diodes 21 diodes 750B Additional 2 LED driver ICs Quad Op-Amp IC 4 transistors 1 zener diode 6 diodes 19 LEDs
7-inch by 19-inch standard rack front panel by 12 inches deep U778cm x 4826cm x 3048cm)
57 Ibs(259kg) net 63 lbs (286kg) shipping
All specifications apply to both the Model 750B and Model 750e
All specifications and features are subject to change without notice
02600
UNPACKING AND SET-UP
Your BGW Power Amplifier is shipped in an advanced packing container
SA VE THE CONTAINER
AND ALL PACKING MATERIAL
The containers should be saved in the event the unit is moved or shipped at some future date Replacement containers are available from BGW for $1400 freight included
Inspect the unit for damage in transit immediately upon receipt If damage is found notify the transportation company immediately Only the consignee may institute a claim with the carrier for shipping damage BGW will cooperate fully in such event Be sure to save the container as evidence of damage for the shipper to inspect
Your BGW Power Amplifier is designed for table-top or rack mounting Since air is drawn into the amplifier at the rear and exhausted through the vents in the sides sufficient airflow must be provided Inadequate ventilation may cause the protective heat sensors to shut one or both channels off The four rubber feet may be removed if units are to be stacked one above the other in a standard relay rack
DO NOT PLUG THE AMPLIFIER
IN YET
All connections should be made before power is applied
02650
RACK MOUNTING HINTS
KEEPING IT COOL
A power amplifier draws energy from a primary electrical service usually a 120 VAC outlet to drive loudspeaker systems with an audio signal Typically only half of the energy can be delivered to the loudspeakers remaining energy is converted into heat and must be dissipated (ventilated) into the air
Air circulating past heat-producing components absorbs the heat and carries it away To accomplish this low and medium power amplifiers rely on natural convection currents while most high power amplifiers use fans If the air flow is impeded the resulting rise in heat may cause an amplifier to stop working or fail
Circulating air currents must not be cut off when installing power amplifiers in racks Power amplifiers using convection cooling require spacing between amplifiers to permit air flow between them Power amplifiers using forced-air cooling on the other hand can usually be stacked closer to each other and may not need any blank panel spacing between amplifiers
To improve natural convection currents within a rack a chimney can be created by closing the back of the rack and venting the rack at the bottom to let in fresh air and at the top to exhaust hot air Vents should be large rectangular slots approximately 19 wide by lj high
The rack cabinet will require some type of blower if a large air-flow is required It is best to exhaust air from the top of the rack rather than to blow it in from the bottom There will be less dust and dirt in the rack this way if the bottom vent is sufficiently large
INST ALLING THE UNITS
Use care when mounting equipment in a rack Place the heaviest units near the bottom of the rack and fill in all unused rack spaces with blank panels Equipment cannot always be supported by front panels alone This is especially true of amplifiers whose depth is more than twice their height Uniform support can be insured by installing bottom or side rails
When racks are to be transported or used in a mobile installation some means of securing the rear of the equipment are required Angle brackets either attached to the bottom side rails or rear panel are practical approaches
03002-1
STEREO INPUT CONNECTIONS
Three-pin XLR and y in phone jacks are provided on the rear of the amplifier for input connections Balanced or unbalanced lines may be used however if input cables are longer than 8 feet balanced lines may be necessary to maintain the signal-to-noise ratio and high frequency response
14 INCH PHONE JACKS The 14 phone jacks are for unbalanced lines only (single conductor shielded) and may be used directly Simply connect the shield to the outer sleeve of the plug and the inner conductor to the tip or buy ready-made cables See diagram below
CONNECT SHIELD HE~RL 10JJ ~ = t
CONNECT INNECOOUCTOR HERE SLEEVE TIP
3-PIN XLR CONNECTORS The 3-pin XLR connectors may be used with balanced (2-conductor shielded) or unbalanced lines They are connected to the amplifiers inputs by using the 8-pin transformer socket they cannot be used directly
Unbalanced Lines To use the 3-pin XLR connectors with unbalanced lines a jumper plug (BGW PIN 1350-0108) must be inserted into each transformer socket The jumper plug connects pin 111 to pin 117 and pin 116 to pin 118 as shown
- -- ----
JUMPER PLUG MUST BE USED WITH UNBALANCED LINES
With the jumper plug in place the 3-pin XLR connector has pin 112 connected to ground and pin 113 to the input of the amplifier Note Rear of plug shown
When using single conductor shielded cable for unbalanced lines connect the inner conductor to pin 113 and the shield to pins 111 amp 112
J--~ When using 2-conductor shielded cable for unbalanced lines connect the high level signal wire to pin 113 the low level signal wire to pin 112 and the shield to pin 111
Note Shield not connected to anything at signal sourcejJ-~
03002-2
To achieve a true balanced input it is necessary to use one transformer for each input These should be plugged into the octal sockets provided Depending on the specific application one of several different transformers may be selected
Forms are included in this manual to help guide you in your use and selection of transformers Use the index below to find the appropriate form to match your needs
CONNECTING ON SOURCE TO ONE AMPLIFIER
Using Balanced Lines Refer to form 1103031
Using Unbalanced Lines Refer to form 1103041
CONNECTING ONE SOURCE TO TWO OR MORE AMPLIFIERS OR DEVICES
Using Balanced Lines Refer to form 1103011
Using Unbalanced Lines Refer to form 1103021
NOTE Each amplifier input will be referred to as the Load in the above mentioned forms Only one channel will be shown
Two conductor shielded cable should be used in a balanced line system Connect input cables as shown below
Pin III Shield (Ground) Pin 112 Signal (Minus) Pin 113 Signal (Plus) ~ t~~=i-~-3
FOR MONO (BRIDGED) OPERATION
To operate the unit as a mono amplifier use the left channel input only DO NOT use the right channel input Remember to place the stereomono switch in the mono position
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
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4
I
SOUICE IISISTANCE
(1
1M
4
2
bull bull 10
20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
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5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
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cs ~ I RI GHT 6 (i AN [
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I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
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SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
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x r R BLU 2
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NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
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BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
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+ 10f
lce ~C ~ I N4r OA
4 middot11(
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c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
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[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
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~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
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bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
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00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
00601-1
- IMPORTANTshy
PLEASE READ THIS PAGE BEFORE OPERATING
YOUR
BGW POWER AMPLIFIER
Your new BG W amplifier is designed to provide years of trouble free performance Observing these few precautions will insure proper operation
Read all Instructions before connecting any AC power to your power am plifier
Retain this Manual for future reference
Heed al1 warnings on the top or rear of the power amplifier
The amplifier should not be used near water - for example near a bathtub washbowl kitchen sink laundry tub in a wet basement or near a swimming pool etc
The amplifier should be situated so that its location or position does not interfere with its proper ventilation For example it should not be situated on a bed sofa rug or similar surface that may block the ventilation openings or placed in a built-in instal1ation such as a bookcase or cabinet that may impede the flow of air through the ventilation openings
The amplifier should be situated away from heat sources such as radiators heat registers stoves or other appliances that produce heat
The amplifier should be connected to a power supply only of the type described in the operating instructions or as marked on the rear panel
Precautions that should be taken so that the grounding means of the amplifier is not defeated
The power supply cord should be routed so that it is not likely to be walked on or pinched by items placed upon or against it paying particular attention to cord at the plug convenience receptacles and the point where they exit from the amplifier
Care should be taken so that objects do not fal1 into and liquids are not spilled into the amplifier through openings
00601-2
The amplifier should be serviced by qualified service personnel when
The power supply cord or the plug has been damaged or objects have fallen into or liquid has been spilled into the amplifier or has been exposed to rain or does not appear to operate normally or exhibits a marked change in performance or has been dropped or the enclosure has been damaged
All connections should be made to the power amplifier with the power OFF
Speaker fuses should be used to afford maximum speaker protection
Never connect the output of one channel to that of another
Connect the power cord to the proper voltage mains as indicated on the rear of the amplifier Conversion to another voltage requires internal rewiring
Do not remove the amplifiers cover Amplifiers may not be covered under warranty if they are tampered with There are NO adjustments within Potentially lethal voltages exist wi thin the amplifier Refer all service work to an authorized BGW service station
01601
DESCRIPTION
The BG W 750B and 750C are professional high power stereo amplifiers identical except for their front panel indicator lights Clipping indicators are used on the 750C while the 750B uses dual solid state VU meters (see section 01611)
An onoff circuit-breaker switch gain controls and the indicator lights are located on the front panel Input output and ground connectors as well as the stereomono and meter switches are on the rear panel
Three-pin XLR type plugs can be used for balanced and unbalanced line input connections A jumper plug must be inserted into the transformer socket when unbalanced lines are used and a transformer is required for balanced lines Standard Yt phone jacks are provided for unbalanced line use only and can be used directly (see all input connection sections)
Output connections are made to five-way binding posts that accept banana plugs spade lugs or bare wire Seventy volt distribution lines can be driven directly when the amplifiers are switched to their bridged mono mode Signal ground can be separated from chassis ground if desired by removing the connecting link on the rear panel barrier strip
Features include an error-sensing op-amp input stage to stabilize performance a heat sink mounted bias circuit to provide precise temperature compensation and a full-complementary output stage featuring ten 150 watt transistors in each channel (3000 watt total dissipation capability) Extensive circuitry is used to protect the amplifiers and components connected to them (See section 01611)
Mechanical features include a 16 gauge welded steel chassis wiring massive aluminum heat sinks and modular construction
All active audio components are contained in two modules one for each channel Each consists of a glass epoxy circuit board mechanically coupled to a large aluminum heat sink Thermostat-controlled forced air cooling maintains the modules at a safe operating level Removal of the modules for service is easily accomplished by removing the support screws and the plug-in electrical connectors
Meter switch for 750B only
01611
INDICA TOR AND PROTECTION CIRCUITS
INDICA TOR CIRCUITS
The LEDs located above the gain controls on the 750C front panel serve as clipping indicators They are activated when the amplifier output level (peak) equals the power supply voltage Distortion rises significantly when this occurs because there is not enough energy available to accurately reproduce the signal As this condition can occur at a rate too fast for the eye to follow the LEDs remain lit for Y4 second once clipping is sensed A third red LED is employed as a power on indica tor
Each of the two solid-state YU meters on the 750B features eleven LEDs arranged in an arc The first LED position (left) is a power on indicator The following nine LEDs are calibrated in decibels below rated power with the far right LED indicating 0 dB and the balance ranging downward to -33dB A switch on the rear panel calibrates the meter for four or eight ohm loads This display accurate to + I dB has a response many times faster than the best conventional DArsonval meters and is also more precise The last LED is the same indic~ used in the 750C circuit The meter is protected by a high impact Lexan I
window that resists scratching and color degradation
PROTECTION CIRCUITS
In your unit both the primary mains (ac line) overload protection and the onoff switch have been combined into a rocker-actuated magnetic circuit breaker whose operation unlike fuses is predictable and independent of temperature Returning the switch to the on position resets the system
Speaker protection is provided by relay circuitry that disconnects the load whenever a short-circuit or harmful dc current is present across the output terminals Transients created when removing extremely large signals from the load are suppressed by magnetic-field arc-interruptors mounted on the relay case
The relay circuit includes a time delay that allows the amplifier to stabilize before the speakers are connected It also disconnects the speakers the instant the circuit breaker is shut off eliminating annoying pops and clicks
Thermal-sensing switches increase fan-speed when temperature rises significantly Should the temperature in either output circuit rise beyond a safe level another set of switches will disconnect the load from the amplifier until the amplifier temperature drops to a safe operating level
02100-1
SPECIFICATIONS BGW MODELS 750B and 750C
OUTPUT POWER
225 watts minimum sine wave continuous average power output per channel with both channels driving 8-ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-millwatts to 225 watts shall be no more than 01
1 kHz Power 240 watts into 8-ohms per channel both channels operating 01 Total Harmonic Distortion
360 watts minimum sine wave continuous average power output per channel with both channels driving 4--ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 360 watts shall be no more than 02
1kHz Power 4-00 watts into 4-ohms per channel both channels operating 02 Total Harmonic Distortion
720 watts minimum sine wave continuous average power output monaural driving an 8-ohm load over a power band from 20Hz to 20 kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 720 watts shall be no more than 02
1kHz Power 800 watts into 8-ohms 02 Total Harmonic Distortion
All specifications apply to both the Model 750B and Model 750C
All specifications and features are subject to change without notice
02100-2
Intermodulation Distortion
Small Signal Frequency Response
Hum and Noise Level
Input Sensitivity
Input Impedance
Damping Factor
Output Impedance
Power Requirements
Semiconductor Complement
Dimensions
Weight
SPECIFICATIONS
Less than 002 from 250 milliwatts to rated power
+0 -3dB 1Hz to 90kHz +0-025dB 20Hz to 20kHz
Better than 106dB below 225 watts (unweighted 20Hz to 20kHz)
212 volts for maxi mum power output Voltage gain 26dB (20 times)
Greater than 15k ohms
Greater than 230 to 1 referenced to 8-ohms 1kHz
Designed for any load impedance equal to or greater than 35 ohms
Interchangeable for either 100 120 200 220 or 240 volts AC 50-60Hz 1500 watts
750C 2 Op Amp ICs (equivalent to 44 transistors each) 51 transistors 8 zener diodes 21 diodes 750B Additional 2 LED driver ICs Quad Op-Amp IC 4 transistors 1 zener diode 6 diodes 19 LEDs
7-inch by 19-inch standard rack front panel by 12 inches deep U778cm x 4826cm x 3048cm)
57 Ibs(259kg) net 63 lbs (286kg) shipping
All specifications apply to both the Model 750B and Model 750e
All specifications and features are subject to change without notice
02600
UNPACKING AND SET-UP
Your BGW Power Amplifier is shipped in an advanced packing container
SA VE THE CONTAINER
AND ALL PACKING MATERIAL
The containers should be saved in the event the unit is moved or shipped at some future date Replacement containers are available from BGW for $1400 freight included
Inspect the unit for damage in transit immediately upon receipt If damage is found notify the transportation company immediately Only the consignee may institute a claim with the carrier for shipping damage BGW will cooperate fully in such event Be sure to save the container as evidence of damage for the shipper to inspect
Your BGW Power Amplifier is designed for table-top or rack mounting Since air is drawn into the amplifier at the rear and exhausted through the vents in the sides sufficient airflow must be provided Inadequate ventilation may cause the protective heat sensors to shut one or both channels off The four rubber feet may be removed if units are to be stacked one above the other in a standard relay rack
DO NOT PLUG THE AMPLIFIER
IN YET
All connections should be made before power is applied
02650
RACK MOUNTING HINTS
KEEPING IT COOL
A power amplifier draws energy from a primary electrical service usually a 120 VAC outlet to drive loudspeaker systems with an audio signal Typically only half of the energy can be delivered to the loudspeakers remaining energy is converted into heat and must be dissipated (ventilated) into the air
Air circulating past heat-producing components absorbs the heat and carries it away To accomplish this low and medium power amplifiers rely on natural convection currents while most high power amplifiers use fans If the air flow is impeded the resulting rise in heat may cause an amplifier to stop working or fail
Circulating air currents must not be cut off when installing power amplifiers in racks Power amplifiers using convection cooling require spacing between amplifiers to permit air flow between them Power amplifiers using forced-air cooling on the other hand can usually be stacked closer to each other and may not need any blank panel spacing between amplifiers
To improve natural convection currents within a rack a chimney can be created by closing the back of the rack and venting the rack at the bottom to let in fresh air and at the top to exhaust hot air Vents should be large rectangular slots approximately 19 wide by lj high
The rack cabinet will require some type of blower if a large air-flow is required It is best to exhaust air from the top of the rack rather than to blow it in from the bottom There will be less dust and dirt in the rack this way if the bottom vent is sufficiently large
INST ALLING THE UNITS
Use care when mounting equipment in a rack Place the heaviest units near the bottom of the rack and fill in all unused rack spaces with blank panels Equipment cannot always be supported by front panels alone This is especially true of amplifiers whose depth is more than twice their height Uniform support can be insured by installing bottom or side rails
When racks are to be transported or used in a mobile installation some means of securing the rear of the equipment are required Angle brackets either attached to the bottom side rails or rear panel are practical approaches
03002-1
STEREO INPUT CONNECTIONS
Three-pin XLR and y in phone jacks are provided on the rear of the amplifier for input connections Balanced or unbalanced lines may be used however if input cables are longer than 8 feet balanced lines may be necessary to maintain the signal-to-noise ratio and high frequency response
14 INCH PHONE JACKS The 14 phone jacks are for unbalanced lines only (single conductor shielded) and may be used directly Simply connect the shield to the outer sleeve of the plug and the inner conductor to the tip or buy ready-made cables See diagram below
CONNECT SHIELD HE~RL 10JJ ~ = t
CONNECT INNECOOUCTOR HERE SLEEVE TIP
3-PIN XLR CONNECTORS The 3-pin XLR connectors may be used with balanced (2-conductor shielded) or unbalanced lines They are connected to the amplifiers inputs by using the 8-pin transformer socket they cannot be used directly
Unbalanced Lines To use the 3-pin XLR connectors with unbalanced lines a jumper plug (BGW PIN 1350-0108) must be inserted into each transformer socket The jumper plug connects pin 111 to pin 117 and pin 116 to pin 118 as shown
- -- ----
JUMPER PLUG MUST BE USED WITH UNBALANCED LINES
With the jumper plug in place the 3-pin XLR connector has pin 112 connected to ground and pin 113 to the input of the amplifier Note Rear of plug shown
When using single conductor shielded cable for unbalanced lines connect the inner conductor to pin 113 and the shield to pins 111 amp 112
J--~ When using 2-conductor shielded cable for unbalanced lines connect the high level signal wire to pin 113 the low level signal wire to pin 112 and the shield to pin 111
Note Shield not connected to anything at signal sourcejJ-~
03002-2
To achieve a true balanced input it is necessary to use one transformer for each input These should be plugged into the octal sockets provided Depending on the specific application one of several different transformers may be selected
Forms are included in this manual to help guide you in your use and selection of transformers Use the index below to find the appropriate form to match your needs
CONNECTING ON SOURCE TO ONE AMPLIFIER
Using Balanced Lines Refer to form 1103031
Using Unbalanced Lines Refer to form 1103041
CONNECTING ONE SOURCE TO TWO OR MORE AMPLIFIERS OR DEVICES
Using Balanced Lines Refer to form 1103011
Using Unbalanced Lines Refer to form 1103021
NOTE Each amplifier input will be referred to as the Load in the above mentioned forms Only one channel will be shown
Two conductor shielded cable should be used in a balanced line system Connect input cables as shown below
Pin III Shield (Ground) Pin 112 Signal (Minus) Pin 113 Signal (Plus) ~ t~~=i-~-3
FOR MONO (BRIDGED) OPERATION
To operate the unit as a mono amplifier use the left channel input only DO NOT use the right channel input Remember to place the stereomono switch in the mono position
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
bull 7
bull s
4
I
SOUICE IISISTANCE
(1
1M
4
2
bull bull 10
20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
bullbull
5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
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SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
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PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
-----4 - 10V
c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
~ I (El
LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
C I I IJ Ui- 1 5 1 D I PPE D T 1 J TAL 1)1 0221)-OU10 C~ 220Jpc I K J ~) [ S C C f rlt AI Ie 0100-1)220 CJ 5ltJIJF 1 2 V LECT0-JLfTIC Ct 5 6- 0 J 50 C J47U F 251 0lSC C~~~~[C () 12 J-O J I (
C j4UF ~lt-j l J [ iC CC~A ~ l C OIL ) - 0 ) 4 7
c) 3jPF IOUV gt10 t) I[Cl (01) J - OJ]O
C I (J 0 gt10 500V L) [-pcu 11 C A O]nO -O I JO
CJ 4(r= I K J u IC CcRAIC o t 0 l -OU 47 cJ bull J OJ )F I v DISC C~JII L OIOO-OJCl5
cia 120~F Suov OIPP2~ MICA U)iO-Ol0
C I I 2 v U~ I 0 ) 1 c L fO C T ( (J L Y rI C 04J 5 - 002ll C I 2 2 lf- I)JV F L fC T rilJLYTIC 0( j6-0(2 0 C 1 3 I ~OP F scav O[gtPEO ~[ CA 01))0 -0120 CI4 lL O~F 5uOV DI~PcD MICA 0 ) 0 -0120 CI S IUr l5v U[SC CLHAlpoundC 0 1 29-010 0 CII) 2~OJPF S00V DISC (E-A~ I C 0C) I()-2500
C17 2~OlJoF 500v D ISC C~~A~IC )0 middot 0 - 2-gt00 C I 3 IUF 100V O I P)iC) middotIYL K U 3~ )- 0 1 00
C 1 i IUI ~51 GISC c ylt ~I[C O J ) q-IJIOJ
C~O IJO ~F I KV OIC CEFH~IC Ol ()0-1000 CLI bull [ 7 J F 1 ) 0 V LJ I gt D E D ( L A Flt I () ~ C ]r q -O middotI 71
IU r=
lUi-
IJ OJ0F
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lKV J [ SC ~RA ~ I C J [ J J - 1 ) l (
C ( 1 l ( 7 4 I ) J L T L ~ r r~ 1 ) ) ) - 14 J
C~ 2 4 74J A [ oj vJLT Lgttr lJ uQ - 4 14 )
CJ [ 4 I ~ 1 J [ Sd r C 1 loj C ) ) LI
C~4 l bull 4 1 4i _) I S [ T C 1 I G ) I J- co ~ J J 0 - 1 ( G
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I T t lt0 T ) c r C) [T
Ie 1
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J c J t J 1gt 1 r r ~ j I J T gt 1
~ G -I S Y S I L S bull bull c bull 07220-2
~ lG W f) 5~fl igt TI P A~ I 4)
OJ J E 7 2 IJ I P ~ T ~ 0 i I j r R 1 5 4-0120
0 middot ~f-S91 p r ~ AJiljT ] r~ lCjSJ- u C93
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Q ) lJ 5 ~ J I ~ P ~ T ~ Al Lj I r d 1 a ~4-()U4]
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Q I2 5J7J9(~ i P T~ AIJ [ j T J~ I ~J ~ -7j r 4
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01 SJ7j ) 1 rPi T ~lSILJ I l L 4 - ] 9 4
(1 1 SJ7~07 p~p r R ~ N~ jTJ ~ 1 ~3 1-7~()7
) I ~~ S7J 9 -+ P I R A ~J S [JI -I I ~ J4-7j9
8 7 SJ707 r middotJJ r~A Ns rgtr 1 3 5 3-74 ) 7
Cd c SJ73)4 ~ rgt T -IA IgtI ~ i JI t l 4-73 j
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J () S J 7 ] 9 4 ~ ~) j T A i [ I U ltshy 1 J ) 4 - 7 J ~
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- ~- ~ 1shy P_ s r s ru-( i
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shy 7 ~ 2
jh ~ 12 j~
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middot 3 ~) J ri1 ~ 0 1 J ~ rl C ~ ) - 3 i 0 ~~
~ 4 7 JH 1211 5 ~ S ) u -41J2 ~ I v 0 l rl A 1 ~ gt J () fJ 5 - 1 0 ) 2shy
~ J l K 1 h l 1 ~ ~ ~~ fJ 5 -4l0J
r 1 bull 60 J-I J 12 fi -~ J bull -gt O J s -r) j i) 1
rlt L 1 lt -1- i i 1gt ~j ~ r) f] S shy 1 j 1 J
lt I 1 I c bull
1 ) lt
rJJO
4 7 1lt
J r 1 12
0 1 1 2
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gt ~
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) IJ J 5 shy
SO ( shy
1 ~ J - J - C L
I 7 f) J
P S ~ 7
1 )0
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I) 1 ~
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1 gt
J bull
5(0 )-1002
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~ bull9 I J C i 1 5 5 ) Jc-lIJOS pJ 1 u 0 LJ r1 1 12 i gt J u -)- 1 102
~lt ~ I i 0 J --1 12 J ~ S t) V ) shy C )0 1
~ c2
C J
- _t I 0 r
-I e -
1 1 2
lt -= -1 1~ J
I
r I
5 r ~ ) -=) - I r shyc I S~ C i J r ~
lt -- shy I ~ A r r -
q~j 1 ~j ~ J ~ bullbull 1 2 1 - 0 j =-shy 1) ()4
r~t 7gtlt ] r~ 1 ~~ ( ) ~ ) f) J ~ - 7 J J
gtJ V S Y S T = S bull I 1 C bull 07220-3
E jG ~jJ D i~ Sc R r l T I ~l~ I-AH T L)
i G 7 1 J Ilt Cl ~ 1 1 2 ~ ) ~ 500S -I J0 4 ~) ~~ 1 JK 0-11 1 2 J) 50 G) -lu04J
~ ~ l 1 O~ J H 1 2 S SO ()5 -I U05 fUO 4 7 lt J ~t 1 ~ ~ S 0 00) -1 005
j 1 2 7 J r-tv 1 v 5 () J S - 7 J 2 ~J 2 2 7 lt-- J1 1 c gt00) -27) 2 r~ J J 4 bull 7 lt J 1 r 1 L I 50J 5 -4 7 O~ ( - 4 1 ) 0 0 ~ 1 211 50 5 -l u~2
~ yi 1 ) I) O~ 12 gt) 5005-1J()L lt j ) 2 bull 7 Jrl ~ 12 =s~~ t 0 2 ) - 2 J 7 0 ~J 7 2 7 G --i ~ 2 ~ gt ~ 402 ) - 2 0 7 )
f-U 1 bull J 3 (JH 5 y 1 0 40 5J - J J J 0 lt J ) bull ~ J 0 - 5 1 () ~ (~() 5) -O _)JO I J 1 01 1
5 1t1 ~ 4) 5 C - ) J ) (jbull J
~l I middot J 3 Qt-i ~-I ) 1 n ~ 4()0-0330 1 ~l 2 47JIlt -1 middot112 bull SOJl -47i 2
~~ (4- 3 bull jJ 0 I 5 1 O ~
r~ 4 middot ~3 Jri middot1 SI 1 J - 4j)O - JI30 -~ -+ -~
bull J 3 Q 1 5 1 0 -)) 0 - ~) J ) 0 ~ j3 ~1t1 1 5 f 1 O ~ 4(50-)330 ) + 7 middotJJ nd 1 5 1 O~ 4 Q - ) - () j J ) 1- 4 t3 middotjJ ]H 1 c 1 O~ (~O) J - ) 3 30
P- 2 7 01 ~ 2 S 4() ~c - 2J 70
4)t) Jj ) rl J 1 u x 4 j ) Cl- j ) () 1
-(j 1 1 bull -1lt J I iv 1 2 5 Jl J5-1 middot102
~ )2 1 -ilt J middot1 1 2middot S ~ 5 0 u 5 - 1 - 0 2 j3 1 - I) 0 I 1 2 s gtOO)-IJ02
(Jf-3~J-J4 42
J ~gt~ r) - J bull 4 t
1 L 7j1-l21
r S JLAT JQ )1-4JJL ) i_ I ~ 0 7 2 - 3j41
1=- r S I lt r ~ J 1J ~l I f)j( - ~ - l
2 LJC L l q - J I t 1 322 - )() 1 )
- lt) A 3 -gtCi - 1gt ~H lL C 4f) 211 5 - 2) 75
4 () - 1 gt ~ J rH I I ) ) H l L C ) 2 1~ C) -31 5v
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T j 1
T 2 SilTCt T-i C ~ 1 lt L
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---~~ ~ Iftl
~~ I I IDLE Fi R51S
C W I I 508 -0
o gtCo1-i~
1
Imiddot1gtt1 ~~ bull r 0 I I 1~1j8
k ~O I -- -33Z ) t B 7 C bull 000
J-Ficooi Ie j03 r-~e -4 T
o~o
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=
vvvv
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~ 10I ~ 3 J -gt 1lt 1(501 W 0 ~W DI8-12 ~ ~ LM3J15 I- Q5Z 3
pound0 +15V
50
I
--F R ZtII ~fGRIEN _ 0 j Z2 lO rlt
l~1-t
j I)Luli j I R~lt
-) -J 024
tjlAlt 0 - 05eoP ~
YihD ~ o~ 1j CT F
--0H~Z OA i---- --=- CLIP - O ) 2 0
l --01- 501
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004[1gt02RIGHT RS(pA~O I~I~ 41 4J( n IK
DOlaquoshylt IH~1 e
C~2 D VA I47 ~ O~
gt0-0 ~ ~vc gt0)1 Ie 50 3 0 tshy0511- 2 7
RI1 6 D3I~ o~- 21 ~
lt igt R~obull K 14 132 I 10 ~ e e
1( 5 02 RgtJ2shy00 LM3915
(p R h
0-lt
2 - v 1 5 (1 3 o~ 70shyL 1324shy)
+v 0
CLI P D ~2~
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1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
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P6i Ae NO 1
P72 NO
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SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
00601-2
The amplifier should be serviced by qualified service personnel when
The power supply cord or the plug has been damaged or objects have fallen into or liquid has been spilled into the amplifier or has been exposed to rain or does not appear to operate normally or exhibits a marked change in performance or has been dropped or the enclosure has been damaged
All connections should be made to the power amplifier with the power OFF
Speaker fuses should be used to afford maximum speaker protection
Never connect the output of one channel to that of another
Connect the power cord to the proper voltage mains as indicated on the rear of the amplifier Conversion to another voltage requires internal rewiring
Do not remove the amplifiers cover Amplifiers may not be covered under warranty if they are tampered with There are NO adjustments within Potentially lethal voltages exist wi thin the amplifier Refer all service work to an authorized BGW service station
01601
DESCRIPTION
The BG W 750B and 750C are professional high power stereo amplifiers identical except for their front panel indicator lights Clipping indicators are used on the 750C while the 750B uses dual solid state VU meters (see section 01611)
An onoff circuit-breaker switch gain controls and the indicator lights are located on the front panel Input output and ground connectors as well as the stereomono and meter switches are on the rear panel
Three-pin XLR type plugs can be used for balanced and unbalanced line input connections A jumper plug must be inserted into the transformer socket when unbalanced lines are used and a transformer is required for balanced lines Standard Yt phone jacks are provided for unbalanced line use only and can be used directly (see all input connection sections)
Output connections are made to five-way binding posts that accept banana plugs spade lugs or bare wire Seventy volt distribution lines can be driven directly when the amplifiers are switched to their bridged mono mode Signal ground can be separated from chassis ground if desired by removing the connecting link on the rear panel barrier strip
Features include an error-sensing op-amp input stage to stabilize performance a heat sink mounted bias circuit to provide precise temperature compensation and a full-complementary output stage featuring ten 150 watt transistors in each channel (3000 watt total dissipation capability) Extensive circuitry is used to protect the amplifiers and components connected to them (See section 01611)
Mechanical features include a 16 gauge welded steel chassis wiring massive aluminum heat sinks and modular construction
All active audio components are contained in two modules one for each channel Each consists of a glass epoxy circuit board mechanically coupled to a large aluminum heat sink Thermostat-controlled forced air cooling maintains the modules at a safe operating level Removal of the modules for service is easily accomplished by removing the support screws and the plug-in electrical connectors
Meter switch for 750B only
01611
INDICA TOR AND PROTECTION CIRCUITS
INDICA TOR CIRCUITS
The LEDs located above the gain controls on the 750C front panel serve as clipping indicators They are activated when the amplifier output level (peak) equals the power supply voltage Distortion rises significantly when this occurs because there is not enough energy available to accurately reproduce the signal As this condition can occur at a rate too fast for the eye to follow the LEDs remain lit for Y4 second once clipping is sensed A third red LED is employed as a power on indica tor
Each of the two solid-state YU meters on the 750B features eleven LEDs arranged in an arc The first LED position (left) is a power on indicator The following nine LEDs are calibrated in decibels below rated power with the far right LED indicating 0 dB and the balance ranging downward to -33dB A switch on the rear panel calibrates the meter for four or eight ohm loads This display accurate to + I dB has a response many times faster than the best conventional DArsonval meters and is also more precise The last LED is the same indic~ used in the 750C circuit The meter is protected by a high impact Lexan I
window that resists scratching and color degradation
PROTECTION CIRCUITS
In your unit both the primary mains (ac line) overload protection and the onoff switch have been combined into a rocker-actuated magnetic circuit breaker whose operation unlike fuses is predictable and independent of temperature Returning the switch to the on position resets the system
Speaker protection is provided by relay circuitry that disconnects the load whenever a short-circuit or harmful dc current is present across the output terminals Transients created when removing extremely large signals from the load are suppressed by magnetic-field arc-interruptors mounted on the relay case
The relay circuit includes a time delay that allows the amplifier to stabilize before the speakers are connected It also disconnects the speakers the instant the circuit breaker is shut off eliminating annoying pops and clicks
Thermal-sensing switches increase fan-speed when temperature rises significantly Should the temperature in either output circuit rise beyond a safe level another set of switches will disconnect the load from the amplifier until the amplifier temperature drops to a safe operating level
02100-1
SPECIFICATIONS BGW MODELS 750B and 750C
OUTPUT POWER
225 watts minimum sine wave continuous average power output per channel with both channels driving 8-ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-millwatts to 225 watts shall be no more than 01
1 kHz Power 240 watts into 8-ohms per channel both channels operating 01 Total Harmonic Distortion
360 watts minimum sine wave continuous average power output per channel with both channels driving 4--ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 360 watts shall be no more than 02
1kHz Power 4-00 watts into 4-ohms per channel both channels operating 02 Total Harmonic Distortion
720 watts minimum sine wave continuous average power output monaural driving an 8-ohm load over a power band from 20Hz to 20 kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 720 watts shall be no more than 02
1kHz Power 800 watts into 8-ohms 02 Total Harmonic Distortion
All specifications apply to both the Model 750B and Model 750C
All specifications and features are subject to change without notice
02100-2
Intermodulation Distortion
Small Signal Frequency Response
Hum and Noise Level
Input Sensitivity
Input Impedance
Damping Factor
Output Impedance
Power Requirements
Semiconductor Complement
Dimensions
Weight
SPECIFICATIONS
Less than 002 from 250 milliwatts to rated power
+0 -3dB 1Hz to 90kHz +0-025dB 20Hz to 20kHz
Better than 106dB below 225 watts (unweighted 20Hz to 20kHz)
212 volts for maxi mum power output Voltage gain 26dB (20 times)
Greater than 15k ohms
Greater than 230 to 1 referenced to 8-ohms 1kHz
Designed for any load impedance equal to or greater than 35 ohms
Interchangeable for either 100 120 200 220 or 240 volts AC 50-60Hz 1500 watts
750C 2 Op Amp ICs (equivalent to 44 transistors each) 51 transistors 8 zener diodes 21 diodes 750B Additional 2 LED driver ICs Quad Op-Amp IC 4 transistors 1 zener diode 6 diodes 19 LEDs
7-inch by 19-inch standard rack front panel by 12 inches deep U778cm x 4826cm x 3048cm)
57 Ibs(259kg) net 63 lbs (286kg) shipping
All specifications apply to both the Model 750B and Model 750e
All specifications and features are subject to change without notice
02600
UNPACKING AND SET-UP
Your BGW Power Amplifier is shipped in an advanced packing container
SA VE THE CONTAINER
AND ALL PACKING MATERIAL
The containers should be saved in the event the unit is moved or shipped at some future date Replacement containers are available from BGW for $1400 freight included
Inspect the unit for damage in transit immediately upon receipt If damage is found notify the transportation company immediately Only the consignee may institute a claim with the carrier for shipping damage BGW will cooperate fully in such event Be sure to save the container as evidence of damage for the shipper to inspect
Your BGW Power Amplifier is designed for table-top or rack mounting Since air is drawn into the amplifier at the rear and exhausted through the vents in the sides sufficient airflow must be provided Inadequate ventilation may cause the protective heat sensors to shut one or both channels off The four rubber feet may be removed if units are to be stacked one above the other in a standard relay rack
DO NOT PLUG THE AMPLIFIER
IN YET
All connections should be made before power is applied
02650
RACK MOUNTING HINTS
KEEPING IT COOL
A power amplifier draws energy from a primary electrical service usually a 120 VAC outlet to drive loudspeaker systems with an audio signal Typically only half of the energy can be delivered to the loudspeakers remaining energy is converted into heat and must be dissipated (ventilated) into the air
Air circulating past heat-producing components absorbs the heat and carries it away To accomplish this low and medium power amplifiers rely on natural convection currents while most high power amplifiers use fans If the air flow is impeded the resulting rise in heat may cause an amplifier to stop working or fail
Circulating air currents must not be cut off when installing power amplifiers in racks Power amplifiers using convection cooling require spacing between amplifiers to permit air flow between them Power amplifiers using forced-air cooling on the other hand can usually be stacked closer to each other and may not need any blank panel spacing between amplifiers
To improve natural convection currents within a rack a chimney can be created by closing the back of the rack and venting the rack at the bottom to let in fresh air and at the top to exhaust hot air Vents should be large rectangular slots approximately 19 wide by lj high
The rack cabinet will require some type of blower if a large air-flow is required It is best to exhaust air from the top of the rack rather than to blow it in from the bottom There will be less dust and dirt in the rack this way if the bottom vent is sufficiently large
INST ALLING THE UNITS
Use care when mounting equipment in a rack Place the heaviest units near the bottom of the rack and fill in all unused rack spaces with blank panels Equipment cannot always be supported by front panels alone This is especially true of amplifiers whose depth is more than twice their height Uniform support can be insured by installing bottom or side rails
When racks are to be transported or used in a mobile installation some means of securing the rear of the equipment are required Angle brackets either attached to the bottom side rails or rear panel are practical approaches
03002-1
STEREO INPUT CONNECTIONS
Three-pin XLR and y in phone jacks are provided on the rear of the amplifier for input connections Balanced or unbalanced lines may be used however if input cables are longer than 8 feet balanced lines may be necessary to maintain the signal-to-noise ratio and high frequency response
14 INCH PHONE JACKS The 14 phone jacks are for unbalanced lines only (single conductor shielded) and may be used directly Simply connect the shield to the outer sleeve of the plug and the inner conductor to the tip or buy ready-made cables See diagram below
CONNECT SHIELD HE~RL 10JJ ~ = t
CONNECT INNECOOUCTOR HERE SLEEVE TIP
3-PIN XLR CONNECTORS The 3-pin XLR connectors may be used with balanced (2-conductor shielded) or unbalanced lines They are connected to the amplifiers inputs by using the 8-pin transformer socket they cannot be used directly
Unbalanced Lines To use the 3-pin XLR connectors with unbalanced lines a jumper plug (BGW PIN 1350-0108) must be inserted into each transformer socket The jumper plug connects pin 111 to pin 117 and pin 116 to pin 118 as shown
- -- ----
JUMPER PLUG MUST BE USED WITH UNBALANCED LINES
With the jumper plug in place the 3-pin XLR connector has pin 112 connected to ground and pin 113 to the input of the amplifier Note Rear of plug shown
When using single conductor shielded cable for unbalanced lines connect the inner conductor to pin 113 and the shield to pins 111 amp 112
J--~ When using 2-conductor shielded cable for unbalanced lines connect the high level signal wire to pin 113 the low level signal wire to pin 112 and the shield to pin 111
Note Shield not connected to anything at signal sourcejJ-~
03002-2
To achieve a true balanced input it is necessary to use one transformer for each input These should be plugged into the octal sockets provided Depending on the specific application one of several different transformers may be selected
Forms are included in this manual to help guide you in your use and selection of transformers Use the index below to find the appropriate form to match your needs
CONNECTING ON SOURCE TO ONE AMPLIFIER
Using Balanced Lines Refer to form 1103031
Using Unbalanced Lines Refer to form 1103041
CONNECTING ONE SOURCE TO TWO OR MORE AMPLIFIERS OR DEVICES
Using Balanced Lines Refer to form 1103011
Using Unbalanced Lines Refer to form 1103021
NOTE Each amplifier input will be referred to as the Load in the above mentioned forms Only one channel will be shown
Two conductor shielded cable should be used in a balanced line system Connect input cables as shown below
Pin III Shield (Ground) Pin 112 Signal (Minus) Pin 113 Signal (Plus) ~ t~~=i-~-3
FOR MONO (BRIDGED) OPERATION
To operate the unit as a mono amplifier use the left channel input only DO NOT use the right channel input Remember to place the stereomono switch in the mono position
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
bull 7
bull s
4
I
SOUICE IISISTANCE
(1
1M
4
2
bull bull 10
20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
bullbull
5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
-----4 - 10V
c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
~ I (El
LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
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C j4UF ~lt-j l J [ iC CC~A ~ l C OIL ) - 0 ) 4 7
c) 3jPF IOUV gt10 t) I[Cl (01) J - OJ]O
C I (J 0 gt10 500V L) [-pcu 11 C A O]nO -O I JO
CJ 4(r= I K J u IC CcRAIC o t 0 l -OU 47 cJ bull J OJ )F I v DISC C~JII L OIOO-OJCl5
cia 120~F Suov OIPP2~ MICA U)iO-Ol0
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C 1 i IUI ~51 GISC c ylt ~I[C O J ) q-IJIOJ
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NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
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052S 0525shy
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DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
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PIN LOCATIONS
Pr GO
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bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
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SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
01601
DESCRIPTION
The BG W 750B and 750C are professional high power stereo amplifiers identical except for their front panel indicator lights Clipping indicators are used on the 750C while the 750B uses dual solid state VU meters (see section 01611)
An onoff circuit-breaker switch gain controls and the indicator lights are located on the front panel Input output and ground connectors as well as the stereomono and meter switches are on the rear panel
Three-pin XLR type plugs can be used for balanced and unbalanced line input connections A jumper plug must be inserted into the transformer socket when unbalanced lines are used and a transformer is required for balanced lines Standard Yt phone jacks are provided for unbalanced line use only and can be used directly (see all input connection sections)
Output connections are made to five-way binding posts that accept banana plugs spade lugs or bare wire Seventy volt distribution lines can be driven directly when the amplifiers are switched to their bridged mono mode Signal ground can be separated from chassis ground if desired by removing the connecting link on the rear panel barrier strip
Features include an error-sensing op-amp input stage to stabilize performance a heat sink mounted bias circuit to provide precise temperature compensation and a full-complementary output stage featuring ten 150 watt transistors in each channel (3000 watt total dissipation capability) Extensive circuitry is used to protect the amplifiers and components connected to them (See section 01611)
Mechanical features include a 16 gauge welded steel chassis wiring massive aluminum heat sinks and modular construction
All active audio components are contained in two modules one for each channel Each consists of a glass epoxy circuit board mechanically coupled to a large aluminum heat sink Thermostat-controlled forced air cooling maintains the modules at a safe operating level Removal of the modules for service is easily accomplished by removing the support screws and the plug-in electrical connectors
Meter switch for 750B only
01611
INDICA TOR AND PROTECTION CIRCUITS
INDICA TOR CIRCUITS
The LEDs located above the gain controls on the 750C front panel serve as clipping indicators They are activated when the amplifier output level (peak) equals the power supply voltage Distortion rises significantly when this occurs because there is not enough energy available to accurately reproduce the signal As this condition can occur at a rate too fast for the eye to follow the LEDs remain lit for Y4 second once clipping is sensed A third red LED is employed as a power on indica tor
Each of the two solid-state YU meters on the 750B features eleven LEDs arranged in an arc The first LED position (left) is a power on indicator The following nine LEDs are calibrated in decibels below rated power with the far right LED indicating 0 dB and the balance ranging downward to -33dB A switch on the rear panel calibrates the meter for four or eight ohm loads This display accurate to + I dB has a response many times faster than the best conventional DArsonval meters and is also more precise The last LED is the same indic~ used in the 750C circuit The meter is protected by a high impact Lexan I
window that resists scratching and color degradation
PROTECTION CIRCUITS
In your unit both the primary mains (ac line) overload protection and the onoff switch have been combined into a rocker-actuated magnetic circuit breaker whose operation unlike fuses is predictable and independent of temperature Returning the switch to the on position resets the system
Speaker protection is provided by relay circuitry that disconnects the load whenever a short-circuit or harmful dc current is present across the output terminals Transients created when removing extremely large signals from the load are suppressed by magnetic-field arc-interruptors mounted on the relay case
The relay circuit includes a time delay that allows the amplifier to stabilize before the speakers are connected It also disconnects the speakers the instant the circuit breaker is shut off eliminating annoying pops and clicks
Thermal-sensing switches increase fan-speed when temperature rises significantly Should the temperature in either output circuit rise beyond a safe level another set of switches will disconnect the load from the amplifier until the amplifier temperature drops to a safe operating level
02100-1
SPECIFICATIONS BGW MODELS 750B and 750C
OUTPUT POWER
225 watts minimum sine wave continuous average power output per channel with both channels driving 8-ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-millwatts to 225 watts shall be no more than 01
1 kHz Power 240 watts into 8-ohms per channel both channels operating 01 Total Harmonic Distortion
360 watts minimum sine wave continuous average power output per channel with both channels driving 4--ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 360 watts shall be no more than 02
1kHz Power 4-00 watts into 4-ohms per channel both channels operating 02 Total Harmonic Distortion
720 watts minimum sine wave continuous average power output monaural driving an 8-ohm load over a power band from 20Hz to 20 kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 720 watts shall be no more than 02
1kHz Power 800 watts into 8-ohms 02 Total Harmonic Distortion
All specifications apply to both the Model 750B and Model 750C
All specifications and features are subject to change without notice
02100-2
Intermodulation Distortion
Small Signal Frequency Response
Hum and Noise Level
Input Sensitivity
Input Impedance
Damping Factor
Output Impedance
Power Requirements
Semiconductor Complement
Dimensions
Weight
SPECIFICATIONS
Less than 002 from 250 milliwatts to rated power
+0 -3dB 1Hz to 90kHz +0-025dB 20Hz to 20kHz
Better than 106dB below 225 watts (unweighted 20Hz to 20kHz)
212 volts for maxi mum power output Voltage gain 26dB (20 times)
Greater than 15k ohms
Greater than 230 to 1 referenced to 8-ohms 1kHz
Designed for any load impedance equal to or greater than 35 ohms
Interchangeable for either 100 120 200 220 or 240 volts AC 50-60Hz 1500 watts
750C 2 Op Amp ICs (equivalent to 44 transistors each) 51 transistors 8 zener diodes 21 diodes 750B Additional 2 LED driver ICs Quad Op-Amp IC 4 transistors 1 zener diode 6 diodes 19 LEDs
7-inch by 19-inch standard rack front panel by 12 inches deep U778cm x 4826cm x 3048cm)
57 Ibs(259kg) net 63 lbs (286kg) shipping
All specifications apply to both the Model 750B and Model 750e
All specifications and features are subject to change without notice
02600
UNPACKING AND SET-UP
Your BGW Power Amplifier is shipped in an advanced packing container
SA VE THE CONTAINER
AND ALL PACKING MATERIAL
The containers should be saved in the event the unit is moved or shipped at some future date Replacement containers are available from BGW for $1400 freight included
Inspect the unit for damage in transit immediately upon receipt If damage is found notify the transportation company immediately Only the consignee may institute a claim with the carrier for shipping damage BGW will cooperate fully in such event Be sure to save the container as evidence of damage for the shipper to inspect
Your BGW Power Amplifier is designed for table-top or rack mounting Since air is drawn into the amplifier at the rear and exhausted through the vents in the sides sufficient airflow must be provided Inadequate ventilation may cause the protective heat sensors to shut one or both channels off The four rubber feet may be removed if units are to be stacked one above the other in a standard relay rack
DO NOT PLUG THE AMPLIFIER
IN YET
All connections should be made before power is applied
02650
RACK MOUNTING HINTS
KEEPING IT COOL
A power amplifier draws energy from a primary electrical service usually a 120 VAC outlet to drive loudspeaker systems with an audio signal Typically only half of the energy can be delivered to the loudspeakers remaining energy is converted into heat and must be dissipated (ventilated) into the air
Air circulating past heat-producing components absorbs the heat and carries it away To accomplish this low and medium power amplifiers rely on natural convection currents while most high power amplifiers use fans If the air flow is impeded the resulting rise in heat may cause an amplifier to stop working or fail
Circulating air currents must not be cut off when installing power amplifiers in racks Power amplifiers using convection cooling require spacing between amplifiers to permit air flow between them Power amplifiers using forced-air cooling on the other hand can usually be stacked closer to each other and may not need any blank panel spacing between amplifiers
To improve natural convection currents within a rack a chimney can be created by closing the back of the rack and venting the rack at the bottom to let in fresh air and at the top to exhaust hot air Vents should be large rectangular slots approximately 19 wide by lj high
The rack cabinet will require some type of blower if a large air-flow is required It is best to exhaust air from the top of the rack rather than to blow it in from the bottom There will be less dust and dirt in the rack this way if the bottom vent is sufficiently large
INST ALLING THE UNITS
Use care when mounting equipment in a rack Place the heaviest units near the bottom of the rack and fill in all unused rack spaces with blank panels Equipment cannot always be supported by front panels alone This is especially true of amplifiers whose depth is more than twice their height Uniform support can be insured by installing bottom or side rails
When racks are to be transported or used in a mobile installation some means of securing the rear of the equipment are required Angle brackets either attached to the bottom side rails or rear panel are practical approaches
03002-1
STEREO INPUT CONNECTIONS
Three-pin XLR and y in phone jacks are provided on the rear of the amplifier for input connections Balanced or unbalanced lines may be used however if input cables are longer than 8 feet balanced lines may be necessary to maintain the signal-to-noise ratio and high frequency response
14 INCH PHONE JACKS The 14 phone jacks are for unbalanced lines only (single conductor shielded) and may be used directly Simply connect the shield to the outer sleeve of the plug and the inner conductor to the tip or buy ready-made cables See diagram below
CONNECT SHIELD HE~RL 10JJ ~ = t
CONNECT INNECOOUCTOR HERE SLEEVE TIP
3-PIN XLR CONNECTORS The 3-pin XLR connectors may be used with balanced (2-conductor shielded) or unbalanced lines They are connected to the amplifiers inputs by using the 8-pin transformer socket they cannot be used directly
Unbalanced Lines To use the 3-pin XLR connectors with unbalanced lines a jumper plug (BGW PIN 1350-0108) must be inserted into each transformer socket The jumper plug connects pin 111 to pin 117 and pin 116 to pin 118 as shown
- -- ----
JUMPER PLUG MUST BE USED WITH UNBALANCED LINES
With the jumper plug in place the 3-pin XLR connector has pin 112 connected to ground and pin 113 to the input of the amplifier Note Rear of plug shown
When using single conductor shielded cable for unbalanced lines connect the inner conductor to pin 113 and the shield to pins 111 amp 112
J--~ When using 2-conductor shielded cable for unbalanced lines connect the high level signal wire to pin 113 the low level signal wire to pin 112 and the shield to pin 111
Note Shield not connected to anything at signal sourcejJ-~
03002-2
To achieve a true balanced input it is necessary to use one transformer for each input These should be plugged into the octal sockets provided Depending on the specific application one of several different transformers may be selected
Forms are included in this manual to help guide you in your use and selection of transformers Use the index below to find the appropriate form to match your needs
CONNECTING ON SOURCE TO ONE AMPLIFIER
Using Balanced Lines Refer to form 1103031
Using Unbalanced Lines Refer to form 1103041
CONNECTING ONE SOURCE TO TWO OR MORE AMPLIFIERS OR DEVICES
Using Balanced Lines Refer to form 1103011
Using Unbalanced Lines Refer to form 1103021
NOTE Each amplifier input will be referred to as the Load in the above mentioned forms Only one channel will be shown
Two conductor shielded cable should be used in a balanced line system Connect input cables as shown below
Pin III Shield (Ground) Pin 112 Signal (Minus) Pin 113 Signal (Plus) ~ t~~=i-~-3
FOR MONO (BRIDGED) OPERATION
To operate the unit as a mono amplifier use the left channel input only DO NOT use the right channel input Remember to place the stereomono switch in the mono position
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
bull 7
bull s
4
I
SOUICE IISISTANCE
(1
1M
4
2
bull bull 10
20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
bullbull
5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
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~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
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c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
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0 I I
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0 ~ I
o N
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~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
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07220-1 h j SYS T IS Io e
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~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
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P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
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SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
01611
INDICA TOR AND PROTECTION CIRCUITS
INDICA TOR CIRCUITS
The LEDs located above the gain controls on the 750C front panel serve as clipping indicators They are activated when the amplifier output level (peak) equals the power supply voltage Distortion rises significantly when this occurs because there is not enough energy available to accurately reproduce the signal As this condition can occur at a rate too fast for the eye to follow the LEDs remain lit for Y4 second once clipping is sensed A third red LED is employed as a power on indica tor
Each of the two solid-state YU meters on the 750B features eleven LEDs arranged in an arc The first LED position (left) is a power on indicator The following nine LEDs are calibrated in decibels below rated power with the far right LED indicating 0 dB and the balance ranging downward to -33dB A switch on the rear panel calibrates the meter for four or eight ohm loads This display accurate to + I dB has a response many times faster than the best conventional DArsonval meters and is also more precise The last LED is the same indic~ used in the 750C circuit The meter is protected by a high impact Lexan I
window that resists scratching and color degradation
PROTECTION CIRCUITS
In your unit both the primary mains (ac line) overload protection and the onoff switch have been combined into a rocker-actuated magnetic circuit breaker whose operation unlike fuses is predictable and independent of temperature Returning the switch to the on position resets the system
Speaker protection is provided by relay circuitry that disconnects the load whenever a short-circuit or harmful dc current is present across the output terminals Transients created when removing extremely large signals from the load are suppressed by magnetic-field arc-interruptors mounted on the relay case
The relay circuit includes a time delay that allows the amplifier to stabilize before the speakers are connected It also disconnects the speakers the instant the circuit breaker is shut off eliminating annoying pops and clicks
Thermal-sensing switches increase fan-speed when temperature rises significantly Should the temperature in either output circuit rise beyond a safe level another set of switches will disconnect the load from the amplifier until the amplifier temperature drops to a safe operating level
02100-1
SPECIFICATIONS BGW MODELS 750B and 750C
OUTPUT POWER
225 watts minimum sine wave continuous average power output per channel with both channels driving 8-ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-millwatts to 225 watts shall be no more than 01
1 kHz Power 240 watts into 8-ohms per channel both channels operating 01 Total Harmonic Distortion
360 watts minimum sine wave continuous average power output per channel with both channels driving 4--ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 360 watts shall be no more than 02
1kHz Power 4-00 watts into 4-ohms per channel both channels operating 02 Total Harmonic Distortion
720 watts minimum sine wave continuous average power output monaural driving an 8-ohm load over a power band from 20Hz to 20 kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 720 watts shall be no more than 02
1kHz Power 800 watts into 8-ohms 02 Total Harmonic Distortion
All specifications apply to both the Model 750B and Model 750C
All specifications and features are subject to change without notice
02100-2
Intermodulation Distortion
Small Signal Frequency Response
Hum and Noise Level
Input Sensitivity
Input Impedance
Damping Factor
Output Impedance
Power Requirements
Semiconductor Complement
Dimensions
Weight
SPECIFICATIONS
Less than 002 from 250 milliwatts to rated power
+0 -3dB 1Hz to 90kHz +0-025dB 20Hz to 20kHz
Better than 106dB below 225 watts (unweighted 20Hz to 20kHz)
212 volts for maxi mum power output Voltage gain 26dB (20 times)
Greater than 15k ohms
Greater than 230 to 1 referenced to 8-ohms 1kHz
Designed for any load impedance equal to or greater than 35 ohms
Interchangeable for either 100 120 200 220 or 240 volts AC 50-60Hz 1500 watts
750C 2 Op Amp ICs (equivalent to 44 transistors each) 51 transistors 8 zener diodes 21 diodes 750B Additional 2 LED driver ICs Quad Op-Amp IC 4 transistors 1 zener diode 6 diodes 19 LEDs
7-inch by 19-inch standard rack front panel by 12 inches deep U778cm x 4826cm x 3048cm)
57 Ibs(259kg) net 63 lbs (286kg) shipping
All specifications apply to both the Model 750B and Model 750e
All specifications and features are subject to change without notice
02600
UNPACKING AND SET-UP
Your BGW Power Amplifier is shipped in an advanced packing container
SA VE THE CONTAINER
AND ALL PACKING MATERIAL
The containers should be saved in the event the unit is moved or shipped at some future date Replacement containers are available from BGW for $1400 freight included
Inspect the unit for damage in transit immediately upon receipt If damage is found notify the transportation company immediately Only the consignee may institute a claim with the carrier for shipping damage BGW will cooperate fully in such event Be sure to save the container as evidence of damage for the shipper to inspect
Your BGW Power Amplifier is designed for table-top or rack mounting Since air is drawn into the amplifier at the rear and exhausted through the vents in the sides sufficient airflow must be provided Inadequate ventilation may cause the protective heat sensors to shut one or both channels off The four rubber feet may be removed if units are to be stacked one above the other in a standard relay rack
DO NOT PLUG THE AMPLIFIER
IN YET
All connections should be made before power is applied
02650
RACK MOUNTING HINTS
KEEPING IT COOL
A power amplifier draws energy from a primary electrical service usually a 120 VAC outlet to drive loudspeaker systems with an audio signal Typically only half of the energy can be delivered to the loudspeakers remaining energy is converted into heat and must be dissipated (ventilated) into the air
Air circulating past heat-producing components absorbs the heat and carries it away To accomplish this low and medium power amplifiers rely on natural convection currents while most high power amplifiers use fans If the air flow is impeded the resulting rise in heat may cause an amplifier to stop working or fail
Circulating air currents must not be cut off when installing power amplifiers in racks Power amplifiers using convection cooling require spacing between amplifiers to permit air flow between them Power amplifiers using forced-air cooling on the other hand can usually be stacked closer to each other and may not need any blank panel spacing between amplifiers
To improve natural convection currents within a rack a chimney can be created by closing the back of the rack and venting the rack at the bottom to let in fresh air and at the top to exhaust hot air Vents should be large rectangular slots approximately 19 wide by lj high
The rack cabinet will require some type of blower if a large air-flow is required It is best to exhaust air from the top of the rack rather than to blow it in from the bottom There will be less dust and dirt in the rack this way if the bottom vent is sufficiently large
INST ALLING THE UNITS
Use care when mounting equipment in a rack Place the heaviest units near the bottom of the rack and fill in all unused rack spaces with blank panels Equipment cannot always be supported by front panels alone This is especially true of amplifiers whose depth is more than twice their height Uniform support can be insured by installing bottom or side rails
When racks are to be transported or used in a mobile installation some means of securing the rear of the equipment are required Angle brackets either attached to the bottom side rails or rear panel are practical approaches
03002-1
STEREO INPUT CONNECTIONS
Three-pin XLR and y in phone jacks are provided on the rear of the amplifier for input connections Balanced or unbalanced lines may be used however if input cables are longer than 8 feet balanced lines may be necessary to maintain the signal-to-noise ratio and high frequency response
14 INCH PHONE JACKS The 14 phone jacks are for unbalanced lines only (single conductor shielded) and may be used directly Simply connect the shield to the outer sleeve of the plug and the inner conductor to the tip or buy ready-made cables See diagram below
CONNECT SHIELD HE~RL 10JJ ~ = t
CONNECT INNECOOUCTOR HERE SLEEVE TIP
3-PIN XLR CONNECTORS The 3-pin XLR connectors may be used with balanced (2-conductor shielded) or unbalanced lines They are connected to the amplifiers inputs by using the 8-pin transformer socket they cannot be used directly
Unbalanced Lines To use the 3-pin XLR connectors with unbalanced lines a jumper plug (BGW PIN 1350-0108) must be inserted into each transformer socket The jumper plug connects pin 111 to pin 117 and pin 116 to pin 118 as shown
- -- ----
JUMPER PLUG MUST BE USED WITH UNBALANCED LINES
With the jumper plug in place the 3-pin XLR connector has pin 112 connected to ground and pin 113 to the input of the amplifier Note Rear of plug shown
When using single conductor shielded cable for unbalanced lines connect the inner conductor to pin 113 and the shield to pins 111 amp 112
J--~ When using 2-conductor shielded cable for unbalanced lines connect the high level signal wire to pin 113 the low level signal wire to pin 112 and the shield to pin 111
Note Shield not connected to anything at signal sourcejJ-~
03002-2
To achieve a true balanced input it is necessary to use one transformer for each input These should be plugged into the octal sockets provided Depending on the specific application one of several different transformers may be selected
Forms are included in this manual to help guide you in your use and selection of transformers Use the index below to find the appropriate form to match your needs
CONNECTING ON SOURCE TO ONE AMPLIFIER
Using Balanced Lines Refer to form 1103031
Using Unbalanced Lines Refer to form 1103041
CONNECTING ONE SOURCE TO TWO OR MORE AMPLIFIERS OR DEVICES
Using Balanced Lines Refer to form 1103011
Using Unbalanced Lines Refer to form 1103021
NOTE Each amplifier input will be referred to as the Load in the above mentioned forms Only one channel will be shown
Two conductor shielded cable should be used in a balanced line system Connect input cables as shown below
Pin III Shield (Ground) Pin 112 Signal (Minus) Pin 113 Signal (Plus) ~ t~~=i-~-3
FOR MONO (BRIDGED) OPERATION
To operate the unit as a mono amplifier use the left channel input only DO NOT use the right channel input Remember to place the stereomono switch in the mono position
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
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4
I
SOUICE IISISTANCE
(1
1M
4
2
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20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
bullbull
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1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
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LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
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SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
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~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
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BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
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6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
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_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
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~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
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PO
Pi
P pn P60
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P12 -f P11 J L-plO
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Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
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P72 NO
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SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
02100-1
SPECIFICATIONS BGW MODELS 750B and 750C
OUTPUT POWER
225 watts minimum sine wave continuous average power output per channel with both channels driving 8-ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-millwatts to 225 watts shall be no more than 01
1 kHz Power 240 watts into 8-ohms per channel both channels operating 01 Total Harmonic Distortion
360 watts minimum sine wave continuous average power output per channel with both channels driving 4--ohm loads over a power band from 20Hz to 20kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 360 watts shall be no more than 02
1kHz Power 4-00 watts into 4-ohms per channel both channels operating 02 Total Harmonic Distortion
720 watts minimum sine wave continuous average power output monaural driving an 8-ohm load over a power band from 20Hz to 20 kHz The maximum Total Harmonic Distortion at any power level from 250-milliwatts to 720 watts shall be no more than 02
1kHz Power 800 watts into 8-ohms 02 Total Harmonic Distortion
All specifications apply to both the Model 750B and Model 750C
All specifications and features are subject to change without notice
02100-2
Intermodulation Distortion
Small Signal Frequency Response
Hum and Noise Level
Input Sensitivity
Input Impedance
Damping Factor
Output Impedance
Power Requirements
Semiconductor Complement
Dimensions
Weight
SPECIFICATIONS
Less than 002 from 250 milliwatts to rated power
+0 -3dB 1Hz to 90kHz +0-025dB 20Hz to 20kHz
Better than 106dB below 225 watts (unweighted 20Hz to 20kHz)
212 volts for maxi mum power output Voltage gain 26dB (20 times)
Greater than 15k ohms
Greater than 230 to 1 referenced to 8-ohms 1kHz
Designed for any load impedance equal to or greater than 35 ohms
Interchangeable for either 100 120 200 220 or 240 volts AC 50-60Hz 1500 watts
750C 2 Op Amp ICs (equivalent to 44 transistors each) 51 transistors 8 zener diodes 21 diodes 750B Additional 2 LED driver ICs Quad Op-Amp IC 4 transistors 1 zener diode 6 diodes 19 LEDs
7-inch by 19-inch standard rack front panel by 12 inches deep U778cm x 4826cm x 3048cm)
57 Ibs(259kg) net 63 lbs (286kg) shipping
All specifications apply to both the Model 750B and Model 750e
All specifications and features are subject to change without notice
02600
UNPACKING AND SET-UP
Your BGW Power Amplifier is shipped in an advanced packing container
SA VE THE CONTAINER
AND ALL PACKING MATERIAL
The containers should be saved in the event the unit is moved or shipped at some future date Replacement containers are available from BGW for $1400 freight included
Inspect the unit for damage in transit immediately upon receipt If damage is found notify the transportation company immediately Only the consignee may institute a claim with the carrier for shipping damage BGW will cooperate fully in such event Be sure to save the container as evidence of damage for the shipper to inspect
Your BGW Power Amplifier is designed for table-top or rack mounting Since air is drawn into the amplifier at the rear and exhausted through the vents in the sides sufficient airflow must be provided Inadequate ventilation may cause the protective heat sensors to shut one or both channels off The four rubber feet may be removed if units are to be stacked one above the other in a standard relay rack
DO NOT PLUG THE AMPLIFIER
IN YET
All connections should be made before power is applied
02650
RACK MOUNTING HINTS
KEEPING IT COOL
A power amplifier draws energy from a primary electrical service usually a 120 VAC outlet to drive loudspeaker systems with an audio signal Typically only half of the energy can be delivered to the loudspeakers remaining energy is converted into heat and must be dissipated (ventilated) into the air
Air circulating past heat-producing components absorbs the heat and carries it away To accomplish this low and medium power amplifiers rely on natural convection currents while most high power amplifiers use fans If the air flow is impeded the resulting rise in heat may cause an amplifier to stop working or fail
Circulating air currents must not be cut off when installing power amplifiers in racks Power amplifiers using convection cooling require spacing between amplifiers to permit air flow between them Power amplifiers using forced-air cooling on the other hand can usually be stacked closer to each other and may not need any blank panel spacing between amplifiers
To improve natural convection currents within a rack a chimney can be created by closing the back of the rack and venting the rack at the bottom to let in fresh air and at the top to exhaust hot air Vents should be large rectangular slots approximately 19 wide by lj high
The rack cabinet will require some type of blower if a large air-flow is required It is best to exhaust air from the top of the rack rather than to blow it in from the bottom There will be less dust and dirt in the rack this way if the bottom vent is sufficiently large
INST ALLING THE UNITS
Use care when mounting equipment in a rack Place the heaviest units near the bottom of the rack and fill in all unused rack spaces with blank panels Equipment cannot always be supported by front panels alone This is especially true of amplifiers whose depth is more than twice their height Uniform support can be insured by installing bottom or side rails
When racks are to be transported or used in a mobile installation some means of securing the rear of the equipment are required Angle brackets either attached to the bottom side rails or rear panel are practical approaches
03002-1
STEREO INPUT CONNECTIONS
Three-pin XLR and y in phone jacks are provided on the rear of the amplifier for input connections Balanced or unbalanced lines may be used however if input cables are longer than 8 feet balanced lines may be necessary to maintain the signal-to-noise ratio and high frequency response
14 INCH PHONE JACKS The 14 phone jacks are for unbalanced lines only (single conductor shielded) and may be used directly Simply connect the shield to the outer sleeve of the plug and the inner conductor to the tip or buy ready-made cables See diagram below
CONNECT SHIELD HE~RL 10JJ ~ = t
CONNECT INNECOOUCTOR HERE SLEEVE TIP
3-PIN XLR CONNECTORS The 3-pin XLR connectors may be used with balanced (2-conductor shielded) or unbalanced lines They are connected to the amplifiers inputs by using the 8-pin transformer socket they cannot be used directly
Unbalanced Lines To use the 3-pin XLR connectors with unbalanced lines a jumper plug (BGW PIN 1350-0108) must be inserted into each transformer socket The jumper plug connects pin 111 to pin 117 and pin 116 to pin 118 as shown
- -- ----
JUMPER PLUG MUST BE USED WITH UNBALANCED LINES
With the jumper plug in place the 3-pin XLR connector has pin 112 connected to ground and pin 113 to the input of the amplifier Note Rear of plug shown
When using single conductor shielded cable for unbalanced lines connect the inner conductor to pin 113 and the shield to pins 111 amp 112
J--~ When using 2-conductor shielded cable for unbalanced lines connect the high level signal wire to pin 113 the low level signal wire to pin 112 and the shield to pin 111
Note Shield not connected to anything at signal sourcejJ-~
03002-2
To achieve a true balanced input it is necessary to use one transformer for each input These should be plugged into the octal sockets provided Depending on the specific application one of several different transformers may be selected
Forms are included in this manual to help guide you in your use and selection of transformers Use the index below to find the appropriate form to match your needs
CONNECTING ON SOURCE TO ONE AMPLIFIER
Using Balanced Lines Refer to form 1103031
Using Unbalanced Lines Refer to form 1103041
CONNECTING ONE SOURCE TO TWO OR MORE AMPLIFIERS OR DEVICES
Using Balanced Lines Refer to form 1103011
Using Unbalanced Lines Refer to form 1103021
NOTE Each amplifier input will be referred to as the Load in the above mentioned forms Only one channel will be shown
Two conductor shielded cable should be used in a balanced line system Connect input cables as shown below
Pin III Shield (Ground) Pin 112 Signal (Minus) Pin 113 Signal (Plus) ~ t~~=i-~-3
FOR MONO (BRIDGED) OPERATION
To operate the unit as a mono amplifier use the left channel input only DO NOT use the right channel input Remember to place the stereomono switch in the mono position
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
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4
I
SOUICE IISISTANCE
(1
1M
4
2
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20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
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5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
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I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
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(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
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PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
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BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
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BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
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4 7~~A93 a2e PS 3
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1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
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R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
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0 I I
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0 ~ I
o N
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~ 121J1973aQ51O
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o MFRM - 07211 IIDI ON f
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07220-1 h j SYS T IS Io e
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~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
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bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
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IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
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rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
02100-2
Intermodulation Distortion
Small Signal Frequency Response
Hum and Noise Level
Input Sensitivity
Input Impedance
Damping Factor
Output Impedance
Power Requirements
Semiconductor Complement
Dimensions
Weight
SPECIFICATIONS
Less than 002 from 250 milliwatts to rated power
+0 -3dB 1Hz to 90kHz +0-025dB 20Hz to 20kHz
Better than 106dB below 225 watts (unweighted 20Hz to 20kHz)
212 volts for maxi mum power output Voltage gain 26dB (20 times)
Greater than 15k ohms
Greater than 230 to 1 referenced to 8-ohms 1kHz
Designed for any load impedance equal to or greater than 35 ohms
Interchangeable for either 100 120 200 220 or 240 volts AC 50-60Hz 1500 watts
750C 2 Op Amp ICs (equivalent to 44 transistors each) 51 transistors 8 zener diodes 21 diodes 750B Additional 2 LED driver ICs Quad Op-Amp IC 4 transistors 1 zener diode 6 diodes 19 LEDs
7-inch by 19-inch standard rack front panel by 12 inches deep U778cm x 4826cm x 3048cm)
57 Ibs(259kg) net 63 lbs (286kg) shipping
All specifications apply to both the Model 750B and Model 750e
All specifications and features are subject to change without notice
02600
UNPACKING AND SET-UP
Your BGW Power Amplifier is shipped in an advanced packing container
SA VE THE CONTAINER
AND ALL PACKING MATERIAL
The containers should be saved in the event the unit is moved or shipped at some future date Replacement containers are available from BGW for $1400 freight included
Inspect the unit for damage in transit immediately upon receipt If damage is found notify the transportation company immediately Only the consignee may institute a claim with the carrier for shipping damage BGW will cooperate fully in such event Be sure to save the container as evidence of damage for the shipper to inspect
Your BGW Power Amplifier is designed for table-top or rack mounting Since air is drawn into the amplifier at the rear and exhausted through the vents in the sides sufficient airflow must be provided Inadequate ventilation may cause the protective heat sensors to shut one or both channels off The four rubber feet may be removed if units are to be stacked one above the other in a standard relay rack
DO NOT PLUG THE AMPLIFIER
IN YET
All connections should be made before power is applied
02650
RACK MOUNTING HINTS
KEEPING IT COOL
A power amplifier draws energy from a primary electrical service usually a 120 VAC outlet to drive loudspeaker systems with an audio signal Typically only half of the energy can be delivered to the loudspeakers remaining energy is converted into heat and must be dissipated (ventilated) into the air
Air circulating past heat-producing components absorbs the heat and carries it away To accomplish this low and medium power amplifiers rely on natural convection currents while most high power amplifiers use fans If the air flow is impeded the resulting rise in heat may cause an amplifier to stop working or fail
Circulating air currents must not be cut off when installing power amplifiers in racks Power amplifiers using convection cooling require spacing between amplifiers to permit air flow between them Power amplifiers using forced-air cooling on the other hand can usually be stacked closer to each other and may not need any blank panel spacing between amplifiers
To improve natural convection currents within a rack a chimney can be created by closing the back of the rack and venting the rack at the bottom to let in fresh air and at the top to exhaust hot air Vents should be large rectangular slots approximately 19 wide by lj high
The rack cabinet will require some type of blower if a large air-flow is required It is best to exhaust air from the top of the rack rather than to blow it in from the bottom There will be less dust and dirt in the rack this way if the bottom vent is sufficiently large
INST ALLING THE UNITS
Use care when mounting equipment in a rack Place the heaviest units near the bottom of the rack and fill in all unused rack spaces with blank panels Equipment cannot always be supported by front panels alone This is especially true of amplifiers whose depth is more than twice their height Uniform support can be insured by installing bottom or side rails
When racks are to be transported or used in a mobile installation some means of securing the rear of the equipment are required Angle brackets either attached to the bottom side rails or rear panel are practical approaches
03002-1
STEREO INPUT CONNECTIONS
Three-pin XLR and y in phone jacks are provided on the rear of the amplifier for input connections Balanced or unbalanced lines may be used however if input cables are longer than 8 feet balanced lines may be necessary to maintain the signal-to-noise ratio and high frequency response
14 INCH PHONE JACKS The 14 phone jacks are for unbalanced lines only (single conductor shielded) and may be used directly Simply connect the shield to the outer sleeve of the plug and the inner conductor to the tip or buy ready-made cables See diagram below
CONNECT SHIELD HE~RL 10JJ ~ = t
CONNECT INNECOOUCTOR HERE SLEEVE TIP
3-PIN XLR CONNECTORS The 3-pin XLR connectors may be used with balanced (2-conductor shielded) or unbalanced lines They are connected to the amplifiers inputs by using the 8-pin transformer socket they cannot be used directly
Unbalanced Lines To use the 3-pin XLR connectors with unbalanced lines a jumper plug (BGW PIN 1350-0108) must be inserted into each transformer socket The jumper plug connects pin 111 to pin 117 and pin 116 to pin 118 as shown
- -- ----
JUMPER PLUG MUST BE USED WITH UNBALANCED LINES
With the jumper plug in place the 3-pin XLR connector has pin 112 connected to ground and pin 113 to the input of the amplifier Note Rear of plug shown
When using single conductor shielded cable for unbalanced lines connect the inner conductor to pin 113 and the shield to pins 111 amp 112
J--~ When using 2-conductor shielded cable for unbalanced lines connect the high level signal wire to pin 113 the low level signal wire to pin 112 and the shield to pin 111
Note Shield not connected to anything at signal sourcejJ-~
03002-2
To achieve a true balanced input it is necessary to use one transformer for each input These should be plugged into the octal sockets provided Depending on the specific application one of several different transformers may be selected
Forms are included in this manual to help guide you in your use and selection of transformers Use the index below to find the appropriate form to match your needs
CONNECTING ON SOURCE TO ONE AMPLIFIER
Using Balanced Lines Refer to form 1103031
Using Unbalanced Lines Refer to form 1103041
CONNECTING ONE SOURCE TO TWO OR MORE AMPLIFIERS OR DEVICES
Using Balanced Lines Refer to form 1103011
Using Unbalanced Lines Refer to form 1103021
NOTE Each amplifier input will be referred to as the Load in the above mentioned forms Only one channel will be shown
Two conductor shielded cable should be used in a balanced line system Connect input cables as shown below
Pin III Shield (Ground) Pin 112 Signal (Minus) Pin 113 Signal (Plus) ~ t~~=i-~-3
FOR MONO (BRIDGED) OPERATION
To operate the unit as a mono amplifier use the left channel input only DO NOT use the right channel input Remember to place the stereomono switch in the mono position
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
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4
I
SOUICE IISISTANCE
(1
1M
4
2
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20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
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5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
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I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
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BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
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BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
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4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
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_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
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1 SIGGND
I 10
I CLIP
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Cll 3D ~~
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o N
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~ 121J1973aQ51O
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o MFRM - 07211 IIDI ON f
I
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CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
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=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
02600
UNPACKING AND SET-UP
Your BGW Power Amplifier is shipped in an advanced packing container
SA VE THE CONTAINER
AND ALL PACKING MATERIAL
The containers should be saved in the event the unit is moved or shipped at some future date Replacement containers are available from BGW for $1400 freight included
Inspect the unit for damage in transit immediately upon receipt If damage is found notify the transportation company immediately Only the consignee may institute a claim with the carrier for shipping damage BGW will cooperate fully in such event Be sure to save the container as evidence of damage for the shipper to inspect
Your BGW Power Amplifier is designed for table-top or rack mounting Since air is drawn into the amplifier at the rear and exhausted through the vents in the sides sufficient airflow must be provided Inadequate ventilation may cause the protective heat sensors to shut one or both channels off The four rubber feet may be removed if units are to be stacked one above the other in a standard relay rack
DO NOT PLUG THE AMPLIFIER
IN YET
All connections should be made before power is applied
02650
RACK MOUNTING HINTS
KEEPING IT COOL
A power amplifier draws energy from a primary electrical service usually a 120 VAC outlet to drive loudspeaker systems with an audio signal Typically only half of the energy can be delivered to the loudspeakers remaining energy is converted into heat and must be dissipated (ventilated) into the air
Air circulating past heat-producing components absorbs the heat and carries it away To accomplish this low and medium power amplifiers rely on natural convection currents while most high power amplifiers use fans If the air flow is impeded the resulting rise in heat may cause an amplifier to stop working or fail
Circulating air currents must not be cut off when installing power amplifiers in racks Power amplifiers using convection cooling require spacing between amplifiers to permit air flow between them Power amplifiers using forced-air cooling on the other hand can usually be stacked closer to each other and may not need any blank panel spacing between amplifiers
To improve natural convection currents within a rack a chimney can be created by closing the back of the rack and venting the rack at the bottom to let in fresh air and at the top to exhaust hot air Vents should be large rectangular slots approximately 19 wide by lj high
The rack cabinet will require some type of blower if a large air-flow is required It is best to exhaust air from the top of the rack rather than to blow it in from the bottom There will be less dust and dirt in the rack this way if the bottom vent is sufficiently large
INST ALLING THE UNITS
Use care when mounting equipment in a rack Place the heaviest units near the bottom of the rack and fill in all unused rack spaces with blank panels Equipment cannot always be supported by front panels alone This is especially true of amplifiers whose depth is more than twice their height Uniform support can be insured by installing bottom or side rails
When racks are to be transported or used in a mobile installation some means of securing the rear of the equipment are required Angle brackets either attached to the bottom side rails or rear panel are practical approaches
03002-1
STEREO INPUT CONNECTIONS
Three-pin XLR and y in phone jacks are provided on the rear of the amplifier for input connections Balanced or unbalanced lines may be used however if input cables are longer than 8 feet balanced lines may be necessary to maintain the signal-to-noise ratio and high frequency response
14 INCH PHONE JACKS The 14 phone jacks are for unbalanced lines only (single conductor shielded) and may be used directly Simply connect the shield to the outer sleeve of the plug and the inner conductor to the tip or buy ready-made cables See diagram below
CONNECT SHIELD HE~RL 10JJ ~ = t
CONNECT INNECOOUCTOR HERE SLEEVE TIP
3-PIN XLR CONNECTORS The 3-pin XLR connectors may be used with balanced (2-conductor shielded) or unbalanced lines They are connected to the amplifiers inputs by using the 8-pin transformer socket they cannot be used directly
Unbalanced Lines To use the 3-pin XLR connectors with unbalanced lines a jumper plug (BGW PIN 1350-0108) must be inserted into each transformer socket The jumper plug connects pin 111 to pin 117 and pin 116 to pin 118 as shown
- -- ----
JUMPER PLUG MUST BE USED WITH UNBALANCED LINES
With the jumper plug in place the 3-pin XLR connector has pin 112 connected to ground and pin 113 to the input of the amplifier Note Rear of plug shown
When using single conductor shielded cable for unbalanced lines connect the inner conductor to pin 113 and the shield to pins 111 amp 112
J--~ When using 2-conductor shielded cable for unbalanced lines connect the high level signal wire to pin 113 the low level signal wire to pin 112 and the shield to pin 111
Note Shield not connected to anything at signal sourcejJ-~
03002-2
To achieve a true balanced input it is necessary to use one transformer for each input These should be plugged into the octal sockets provided Depending on the specific application one of several different transformers may be selected
Forms are included in this manual to help guide you in your use and selection of transformers Use the index below to find the appropriate form to match your needs
CONNECTING ON SOURCE TO ONE AMPLIFIER
Using Balanced Lines Refer to form 1103031
Using Unbalanced Lines Refer to form 1103041
CONNECTING ONE SOURCE TO TWO OR MORE AMPLIFIERS OR DEVICES
Using Balanced Lines Refer to form 1103011
Using Unbalanced Lines Refer to form 1103021
NOTE Each amplifier input will be referred to as the Load in the above mentioned forms Only one channel will be shown
Two conductor shielded cable should be used in a balanced line system Connect input cables as shown below
Pin III Shield (Ground) Pin 112 Signal (Minus) Pin 113 Signal (Plus) ~ t~~=i-~-3
FOR MONO (BRIDGED) OPERATION
To operate the unit as a mono amplifier use the left channel input only DO NOT use the right channel input Remember to place the stereomono switch in the mono position
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
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4
I
SOUICE IISISTANCE
(1
1M
4
2
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20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
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5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
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I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
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PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
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BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
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BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
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4 middot11(
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Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
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1 - DC vOL fi SHOWN t 1a VOL TS fYP
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50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
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NOTES uSSOT~_ ---shy
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1 SIGGND
I 10
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~ 121J1973aQ51O
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I
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P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
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I
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2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
02650
RACK MOUNTING HINTS
KEEPING IT COOL
A power amplifier draws energy from a primary electrical service usually a 120 VAC outlet to drive loudspeaker systems with an audio signal Typically only half of the energy can be delivered to the loudspeakers remaining energy is converted into heat and must be dissipated (ventilated) into the air
Air circulating past heat-producing components absorbs the heat and carries it away To accomplish this low and medium power amplifiers rely on natural convection currents while most high power amplifiers use fans If the air flow is impeded the resulting rise in heat may cause an amplifier to stop working or fail
Circulating air currents must not be cut off when installing power amplifiers in racks Power amplifiers using convection cooling require spacing between amplifiers to permit air flow between them Power amplifiers using forced-air cooling on the other hand can usually be stacked closer to each other and may not need any blank panel spacing between amplifiers
To improve natural convection currents within a rack a chimney can be created by closing the back of the rack and venting the rack at the bottom to let in fresh air and at the top to exhaust hot air Vents should be large rectangular slots approximately 19 wide by lj high
The rack cabinet will require some type of blower if a large air-flow is required It is best to exhaust air from the top of the rack rather than to blow it in from the bottom There will be less dust and dirt in the rack this way if the bottom vent is sufficiently large
INST ALLING THE UNITS
Use care when mounting equipment in a rack Place the heaviest units near the bottom of the rack and fill in all unused rack spaces with blank panels Equipment cannot always be supported by front panels alone This is especially true of amplifiers whose depth is more than twice their height Uniform support can be insured by installing bottom or side rails
When racks are to be transported or used in a mobile installation some means of securing the rear of the equipment are required Angle brackets either attached to the bottom side rails or rear panel are practical approaches
03002-1
STEREO INPUT CONNECTIONS
Three-pin XLR and y in phone jacks are provided on the rear of the amplifier for input connections Balanced or unbalanced lines may be used however if input cables are longer than 8 feet balanced lines may be necessary to maintain the signal-to-noise ratio and high frequency response
14 INCH PHONE JACKS The 14 phone jacks are for unbalanced lines only (single conductor shielded) and may be used directly Simply connect the shield to the outer sleeve of the plug and the inner conductor to the tip or buy ready-made cables See diagram below
CONNECT SHIELD HE~RL 10JJ ~ = t
CONNECT INNECOOUCTOR HERE SLEEVE TIP
3-PIN XLR CONNECTORS The 3-pin XLR connectors may be used with balanced (2-conductor shielded) or unbalanced lines They are connected to the amplifiers inputs by using the 8-pin transformer socket they cannot be used directly
Unbalanced Lines To use the 3-pin XLR connectors with unbalanced lines a jumper plug (BGW PIN 1350-0108) must be inserted into each transformer socket The jumper plug connects pin 111 to pin 117 and pin 116 to pin 118 as shown
- -- ----
JUMPER PLUG MUST BE USED WITH UNBALANCED LINES
With the jumper plug in place the 3-pin XLR connector has pin 112 connected to ground and pin 113 to the input of the amplifier Note Rear of plug shown
When using single conductor shielded cable for unbalanced lines connect the inner conductor to pin 113 and the shield to pins 111 amp 112
J--~ When using 2-conductor shielded cable for unbalanced lines connect the high level signal wire to pin 113 the low level signal wire to pin 112 and the shield to pin 111
Note Shield not connected to anything at signal sourcejJ-~
03002-2
To achieve a true balanced input it is necessary to use one transformer for each input These should be plugged into the octal sockets provided Depending on the specific application one of several different transformers may be selected
Forms are included in this manual to help guide you in your use and selection of transformers Use the index below to find the appropriate form to match your needs
CONNECTING ON SOURCE TO ONE AMPLIFIER
Using Balanced Lines Refer to form 1103031
Using Unbalanced Lines Refer to form 1103041
CONNECTING ONE SOURCE TO TWO OR MORE AMPLIFIERS OR DEVICES
Using Balanced Lines Refer to form 1103011
Using Unbalanced Lines Refer to form 1103021
NOTE Each amplifier input will be referred to as the Load in the above mentioned forms Only one channel will be shown
Two conductor shielded cable should be used in a balanced line system Connect input cables as shown below
Pin III Shield (Ground) Pin 112 Signal (Minus) Pin 113 Signal (Plus) ~ t~~=i-~-3
FOR MONO (BRIDGED) OPERATION
To operate the unit as a mono amplifier use the left channel input only DO NOT use the right channel input Remember to place the stereomono switch in the mono position
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
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4
I
SOUICE IISISTANCE
(1
1M
4
2
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20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
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5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
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5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
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(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
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I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
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PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
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BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
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BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
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4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
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2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
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1 SIGGND
I 10
I CLIP
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0 I I
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Cll 3D ~~
0 ~ I
o N
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~ 121J1973aQ51O
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o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
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I
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2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
03002-1
STEREO INPUT CONNECTIONS
Three-pin XLR and y in phone jacks are provided on the rear of the amplifier for input connections Balanced or unbalanced lines may be used however if input cables are longer than 8 feet balanced lines may be necessary to maintain the signal-to-noise ratio and high frequency response
14 INCH PHONE JACKS The 14 phone jacks are for unbalanced lines only (single conductor shielded) and may be used directly Simply connect the shield to the outer sleeve of the plug and the inner conductor to the tip or buy ready-made cables See diagram below
CONNECT SHIELD HE~RL 10JJ ~ = t
CONNECT INNECOOUCTOR HERE SLEEVE TIP
3-PIN XLR CONNECTORS The 3-pin XLR connectors may be used with balanced (2-conductor shielded) or unbalanced lines They are connected to the amplifiers inputs by using the 8-pin transformer socket they cannot be used directly
Unbalanced Lines To use the 3-pin XLR connectors with unbalanced lines a jumper plug (BGW PIN 1350-0108) must be inserted into each transformer socket The jumper plug connects pin 111 to pin 117 and pin 116 to pin 118 as shown
- -- ----
JUMPER PLUG MUST BE USED WITH UNBALANCED LINES
With the jumper plug in place the 3-pin XLR connector has pin 112 connected to ground and pin 113 to the input of the amplifier Note Rear of plug shown
When using single conductor shielded cable for unbalanced lines connect the inner conductor to pin 113 and the shield to pins 111 amp 112
J--~ When using 2-conductor shielded cable for unbalanced lines connect the high level signal wire to pin 113 the low level signal wire to pin 112 and the shield to pin 111
Note Shield not connected to anything at signal sourcejJ-~
03002-2
To achieve a true balanced input it is necessary to use one transformer for each input These should be plugged into the octal sockets provided Depending on the specific application one of several different transformers may be selected
Forms are included in this manual to help guide you in your use and selection of transformers Use the index below to find the appropriate form to match your needs
CONNECTING ON SOURCE TO ONE AMPLIFIER
Using Balanced Lines Refer to form 1103031
Using Unbalanced Lines Refer to form 1103041
CONNECTING ONE SOURCE TO TWO OR MORE AMPLIFIERS OR DEVICES
Using Balanced Lines Refer to form 1103011
Using Unbalanced Lines Refer to form 1103021
NOTE Each amplifier input will be referred to as the Load in the above mentioned forms Only one channel will be shown
Two conductor shielded cable should be used in a balanced line system Connect input cables as shown below
Pin III Shield (Ground) Pin 112 Signal (Minus) Pin 113 Signal (Plus) ~ t~~=i-~-3
FOR MONO (BRIDGED) OPERATION
To operate the unit as a mono amplifier use the left channel input only DO NOT use the right channel input Remember to place the stereomono switch in the mono position
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
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4
I
SOUICE IISISTANCE
(1
1M
4
2
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20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
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5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
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I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
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SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
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x r R BLU 2
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NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
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BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
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1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
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R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
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~ 121J1973aQ51O
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o MFRM - 07211 IIDI ON f
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07220-1 h j SYS T IS Io e
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NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
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DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
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- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
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fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
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SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
03002-2
To achieve a true balanced input it is necessary to use one transformer for each input These should be plugged into the octal sockets provided Depending on the specific application one of several different transformers may be selected
Forms are included in this manual to help guide you in your use and selection of transformers Use the index below to find the appropriate form to match your needs
CONNECTING ON SOURCE TO ONE AMPLIFIER
Using Balanced Lines Refer to form 1103031
Using Unbalanced Lines Refer to form 1103041
CONNECTING ONE SOURCE TO TWO OR MORE AMPLIFIERS OR DEVICES
Using Balanced Lines Refer to form 1103011
Using Unbalanced Lines Refer to form 1103021
NOTE Each amplifier input will be referred to as the Load in the above mentioned forms Only one channel will be shown
Two conductor shielded cable should be used in a balanced line system Connect input cables as shown below
Pin III Shield (Ground) Pin 112 Signal (Minus) Pin 113 Signal (Plus) ~ t~~=i-~-3
FOR MONO (BRIDGED) OPERATION
To operate the unit as a mono amplifier use the left channel input only DO NOT use the right channel input Remember to place the stereomono switch in the mono position
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
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4
I
SOUICE IISISTANCE
(1
1M
4
2
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20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
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1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
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5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
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I RD 10 1 I
LJ DC I RD I I v+
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LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
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SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
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~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
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BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
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4 7~~A93 a2e PS 3
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6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
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~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
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tN4004
t~1(
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L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
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P72 NO
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IfU ~_NJCI
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rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
03011
BRIDGING BALANCED LINE INPUTS
Used only when two or more devices are driven from the same input line
3
600 ohm 2
~ SOURCE 1 - - ~ r ~ r- shy -
load G load 111 112 liN
MAXIMUM NUMBER OF AMPLIFIER 25ea
Input transformers for above
A Use 11 transformer 600 ohms to 600 ohms
B Nth load must have a terminating resistor added to the secondary of the Input transformer
One alternative configuration is
C 1 1 transformer 15K ohms to 15K ohms
D Nth load must have a terminating resistor added to the primary of the input transformer
To find this resistance value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
bull 7
bull s
4
I
SOUICE IISISTANCE
(1
1M
4
2
bull bull 10
20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
bullbull
5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
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c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
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0 I I
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LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
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SCH~~ATIC MFR~-07~11
- PAC I FJ R
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=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
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052S 0525shy
0529
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DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
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SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
03021
BRIDGING UNBALANCED LINE INPUTS
Used only when two or more devices are driven from the same Input line
600 ohm HI
~OURCE LO
load load load 111 112 liN
The Nth load should have a terminating resistor added to its octal plug between pin 1 and pin 6
To find this resistor value see sheet TERMINATING RESISTANCE CHART MFRM 03051
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
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4
I
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(1
1M
4
2
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20
ANNEALED COPPEI
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-10
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2
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I
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ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
bullbull
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1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
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R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
-----4 - 10V
c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
~ I (El
LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
C I I IJ Ui- 1 5 1 D I PPE D T 1 J TAL 1)1 0221)-OU10 C~ 220Jpc I K J ~) [ S C C f rlt AI Ie 0100-1)220 CJ 5ltJIJF 1 2 V LECT0-JLfTIC Ct 5 6- 0 J 50 C J47U F 251 0lSC C~~~~[C () 12 J-O J I (
C j4UF ~lt-j l J [ iC CC~A ~ l C OIL ) - 0 ) 4 7
c) 3jPF IOUV gt10 t) I[Cl (01) J - OJ]O
C I (J 0 gt10 500V L) [-pcu 11 C A O]nO -O I JO
CJ 4(r= I K J u IC CcRAIC o t 0 l -OU 47 cJ bull J OJ )F I v DISC C~JII L OIOO-OJCl5
cia 120~F Suov OIPP2~ MICA U)iO-Ol0
C I I 2 v U~ I 0 ) 1 c L fO C T ( (J L Y rI C 04J 5 - 002ll C I 2 2 lf- I)JV F L fC T rilJLYTIC 0( j6-0(2 0 C 1 3 I ~OP F scav O[gtPEO ~[ CA 01))0 -0120 CI4 lL O~F 5uOV DI~PcD MICA 0 ) 0 -0120 CI S IUr l5v U[SC CLHAlpoundC 0 1 29-010 0 CII) 2~OJPF S00V DISC (E-A~ I C 0C) I()-2500
C17 2~OlJoF 500v D ISC C~~A~IC )0 middot 0 - 2-gt00 C I 3 IUF 100V O I P)iC) middotIYL K U 3~ )- 0 1 00
C 1 i IUI ~51 GISC c ylt ~I[C O J ) q-IJIOJ
C~O IJO ~F I KV OIC CEFH~IC Ol ()0-1000 CLI bull [ 7 J F 1 ) 0 V LJ I gt D E D ( L A Flt I () ~ C ]r q -O middotI 71
IU r=
lUi-
IJ OJ0F
I OUV )[ gt)) ~YL r-lt o 3 u) - ) 1 no 10vV ij l t=-JcJ IYL r ()31)9-1OJ
lKV J [ SC ~RA ~ I C J [ J J - 1 ) l (
C ( 1 l ( 7 4 I ) J L T L ~ r r~ 1 ) ) ) - 14 J
C~ 2 4 74J A [ oj vJLT Lgttr lJ uQ - 4 14 )
CJ [ 4 I ~ 1 J [ Sd r C 1 loj C ) ) LI
C~4 l bull 4 1 4i _) I S [ T C 1 I G ) I J- co ~ J J 0 - 1 ( G
Clt) [ 1400 ) )() -4lJ ()
I ~v o A ~ ~O ) ) G I) -ij04
C ( r 1 )i) - 474J
I T t lt0 T ) c r C) [T
Ie 1
I J E )O) ) 1~ r ~ ~J cgt r T- ( [ 1 - ) I SO
J c J t J 1gt 1 r r ~ j I J T gt 1
~ G -I S Y S I L S bull bull c bull 07220-2
~ lG W f) 5~fl igt TI P A~ I 4)
OJ J E 7 2 IJ I P ~ T ~ 0 i I j r R 1 5 4-0120
0 middot ~f-S91 p r ~ AJiljT ] r~ lCjSJ- u C93
Cgt S 4 j gt I T ~ lo JC [ T lt 1 ))4 shy ] t~]
Q ) lJ 5 ~ J I ~ P ~ T ~ Al Lj I r d 1 a ~4-()U4]
)( t r5A J P Ishy 1~lo~J I JT JP 1 j~ 3-0J -~]
]j J E 3 4 J P ~ T ) A l J r J t-~ 1--j~ 4-J3~ J
Ci ~ J=J5 rJ i I P A middot l gt gt) 1 3~3-~)3Su
r l I 0 5J7394 rj TP JS [ T J i l 1 -3 )4-7394 () 1 1 SJ7G7 pcJ Tql ~ [jr] l 1 j ) ] - 7 0 7
Q I2 5J7J9(~ i P T~ AIJ [ j T J~ I ~J ~ -7j r 4
(H 3 SJ 7 J 7 f-lto r -J ~ JS I J T llf I ~l i ] - 7 0 1
01 SJ7j ) 1 rPi T ~lSILJ I l L 4 - ] 9 4
(1 1 SJ7~07 p~p r R ~ N~ jTJ ~ 1 ~3 1-7~()7
) I ~~ S7J 9 -+ P I R A ~J S [JI -I I ~ J4-7j9
8 7 SJ707 r middotJJ r~A Ns rgtr 1 3 5 3-74 ) 7
Cd c SJ73)4 ~ rgt T -IA IgtI ~ i JI t l 4-73 j
~) 1 ) S J 707 P ~gt I ) ltIgt I ~ T J ~ 1 ~J-740l
J () S J 7 ] 9 4 ~ ~) j T A i [ I U ltshy 1 J ) 4 - 7 J ~
~ ) I S J 7 -+ ~ 7 P Nf- T Q L I T J flt 1 ~l3-7()7
O~2 ) )J P r JA I I s T ul~ 1 3 3-lJ U
~ 3 J 5 A 4 J P I -lt l I j T J 1 1gt 4- 0 0 43 J~4 P 5 J i F j I ~ N ~ I -gt T j h 1 d J - f) r) 4 ]
- ~- ~ 1shy P_ s r s ru-( i
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jh ~ 12 j~
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~ 1 ) shy H ~ ~ 1 oJ 6 i) 2 0 - 3 () 2 R 4 7 bull shy lt n I I N UOI-45~
middot 3 ~) J ri1 ~ 0 1 J ~ rl C ~ ) - 3 i 0 ~~
~ 4 7 JH 1211 5 ~ S ) u -41J2 ~ I v 0 l rl A 1 ~ gt J () fJ 5 - 1 0 ) 2shy
~ J l K 1 h l 1 ~ ~ ~~ fJ 5 -4l0J
r 1 bull 60 J-I J 12 fi -~ J bull -gt O J s -r) j i) 1
rlt L 1 lt -1- i i 1gt ~j ~ r) f] S shy 1 j 1 J
lt I 1 I c bull
1 ) lt
rJJO
4 7 1lt
J r 1 12
0 1 1 2
I 2 H ~ ~~
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gt ~
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) IJ J 5 shy
SO ( shy
1 ~ J - J - C L
I 7 f) J
P S ~ 7
1 )0
1 1 J
I) 1 ~
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1 gt
J bull
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) i ) 0- 11 () 1 OJ I j 1 L C lt t 1 12 C ~
~ bull9 I J C i 1 5 5 ) Jc-lIJOS pJ 1 u 0 LJ r1 1 12 i gt J u -)- 1 102
~lt ~ I i 0 J --1 12 J ~ S t) V ) shy C )0 1
~ c2
C J
- _t I 0 r
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1 1 2
lt -= -1 1~ J
I
r I
5 r ~ ) -=) - I r shyc I S~ C i J r ~
lt -- shy I ~ A r r -
q~j 1 ~j ~ J ~ bullbull 1 2 1 - 0 j =-shy 1) ()4
r~t 7gtlt ] r~ 1 ~~ ( ) ~ ) f) J ~ - 7 J J
gtJ V S Y S T = S bull I 1 C bull 07220-3
E jG ~jJ D i~ Sc R r l T I ~l~ I-AH T L)
i G 7 1 J Ilt Cl ~ 1 1 2 ~ ) ~ 500S -I J0 4 ~) ~~ 1 JK 0-11 1 2 J) 50 G) -lu04J
~ ~ l 1 O~ J H 1 2 S SO ()5 -I U05 fUO 4 7 lt J ~t 1 ~ ~ S 0 00) -1 005
j 1 2 7 J r-tv 1 v 5 () J S - 7 J 2 ~J 2 2 7 lt-- J1 1 c gt00) -27) 2 r~ J J 4 bull 7 lt J 1 r 1 L I 50J 5 -4 7 O~ ( - 4 1 ) 0 0 ~ 1 211 50 5 -l u~2
~ yi 1 ) I) O~ 12 gt) 5005-1J()L lt j ) 2 bull 7 Jrl ~ 12 =s~~ t 0 2 ) - 2 J 7 0 ~J 7 2 7 G --i ~ 2 ~ gt ~ 402 ) - 2 0 7 )
f-U 1 bull J 3 (JH 5 y 1 0 40 5J - J J J 0 lt J ) bull ~ J 0 - 5 1 () ~ (~() 5) -O _)JO I J 1 01 1
5 1t1 ~ 4) 5 C - ) J ) (jbull J
~l I middot J 3 Qt-i ~-I ) 1 n ~ 4()0-0330 1 ~l 2 47JIlt -1 middot112 bull SOJl -47i 2
~~ (4- 3 bull jJ 0 I 5 1 O ~
r~ 4 middot ~3 Jri middot1 SI 1 J - 4j)O - JI30 -~ -+ -~
bull J 3 Q 1 5 1 0 -)) 0 - ~) J ) 0 ~ j3 ~1t1 1 5 f 1 O ~ 4(50-)330 ) + 7 middotJJ nd 1 5 1 O~ 4 Q - ) - () j J ) 1- 4 t3 middotjJ ]H 1 c 1 O~ (~O) J - ) 3 30
P- 2 7 01 ~ 2 S 4() ~c - 2J 70
4)t) Jj ) rl J 1 u x 4 j ) Cl- j ) () 1
-(j 1 1 bull -1lt J I iv 1 2 5 Jl J5-1 middot102
~ )2 1 -ilt J middot1 1 2middot S ~ 5 0 u 5 - 1 - 0 2 j3 1 - I) 0 I 1 2 s gtOO)-IJ02
(Jf-3~J-J4 42
J ~gt~ r) - J bull 4 t
1 L 7j1-l21
r S JLAT JQ )1-4JJL ) i_ I ~ 0 7 2 - 3j41
1=- r S I lt r ~ J 1J ~l I f)j( - ~ - l
2 LJC L l q - J I t 1 322 - )() 1 )
- lt) A 3 -gtCi - 1gt ~H lL C 4f) 211 5 - 2) 75
4 () - 1 gt ~ J rH I I ) ) H l L C ) 2 1~ C) -31 5v
Ij- J c j -( middots gtLJ T CI) 22 d~ -3u 2)
j 1 r- h J If j gt 1 J 2 - () ) r) (
b - J~ A l -t r- i L ( - jl T ~c) ~Q_ gt -~ 0
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T j 1
T 2 SilTCt T-i C ~ 1 lt L
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---~~ ~ Iftl
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o gtCo1-i~
1
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J-Ficooi Ie j03 r-~e -4 T
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=
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pound0 +15V
50
I
--F R ZtII ~fGRIEN _ 0 j Z2 lO rlt
l~1-t
j I)Luli j I R~lt
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DOlaquoshylt IH~1 e
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gt0-0 ~ ~vc gt0)1 Ie 50 3 0 tshy0511- 2 7
RI1 6 D3I~ o~- 21 ~
lt igt R~obull K 14 132 I 10 ~ e e
1( 5 02 RgtJ2shy00 LM3915
(p R h
0-lt
2 - v 1 5 (1 3 o~ 70shyL 1324shy)
+v 0
CLI P D ~2~
IIIIt[J$ ~r-sl SKCV8I 8GwSVSTEMS 13130 SC1I1HYUj(ON AVE
1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
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tN4004
t~1(
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N4004
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( tOuf 25V
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5 0 tOOn IN5 ~ I
~~
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1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
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SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
03031
BALANCED LINE INPUT
Used only when one amplifier is driven from one source
600 ohm LOAD
Source
Input transformer for above
A Use 15 transformer 600 ohms to 15K ohms
NOTE No 600 ohm TERMINATION IS REQUIRED
B Alternate transformer
Use 1 1 transformer 600 ohms to 600 ohms
NOTE 600 ohms termination is required on the secondary of the transformer
NOTE Terminating resistance is required when source is a transformer sources other than a transformer may not need a termination
600 ohm termination when required can be accomplished by soldering the resistor across pins 1 and 6 of the transformer as shown below
600 OHMS
or by instalJing the resistor in a 14 phone plug and inserting it into the unused unbalanced input jack
e-foOO-~~~ IJ
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
bull 7
bull s
4
I
SOUICE IISISTANCE
(1
1M
4
2
bull bull 10
20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
bullbull
5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
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I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
-----4 - 10V
c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
~ I (El
LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
C I I IJ Ui- 1 5 1 D I PPE D T 1 J TAL 1)1 0221)-OU10 C~ 220Jpc I K J ~) [ S C C f rlt AI Ie 0100-1)220 CJ 5ltJIJF 1 2 V LECT0-JLfTIC Ct 5 6- 0 J 50 C J47U F 251 0lSC C~~~~[C () 12 J-O J I (
C j4UF ~lt-j l J [ iC CC~A ~ l C OIL ) - 0 ) 4 7
c) 3jPF IOUV gt10 t) I[Cl (01) J - OJ]O
C I (J 0 gt10 500V L) [-pcu 11 C A O]nO -O I JO
CJ 4(r= I K J u IC CcRAIC o t 0 l -OU 47 cJ bull J OJ )F I v DISC C~JII L OIOO-OJCl5
cia 120~F Suov OIPP2~ MICA U)iO-Ol0
C I I 2 v U~ I 0 ) 1 c L fO C T ( (J L Y rI C 04J 5 - 002ll C I 2 2 lf- I)JV F L fC T rilJLYTIC 0( j6-0(2 0 C 1 3 I ~OP F scav O[gtPEO ~[ CA 01))0 -0120 CI4 lL O~F 5uOV DI~PcD MICA 0 ) 0 -0120 CI S IUr l5v U[SC CLHAlpoundC 0 1 29-010 0 CII) 2~OJPF S00V DISC (E-A~ I C 0C) I()-2500
C17 2~OlJoF 500v D ISC C~~A~IC )0 middot 0 - 2-gt00 C I 3 IUF 100V O I P)iC) middotIYL K U 3~ )- 0 1 00
C 1 i IUI ~51 GISC c ylt ~I[C O J ) q-IJIOJ
C~O IJO ~F I KV OIC CEFH~IC Ol ()0-1000 CLI bull [ 7 J F 1 ) 0 V LJ I gt D E D ( L A Flt I () ~ C ]r q -O middotI 71
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q~j 1 ~j ~ J ~ bullbull 1 2 1 - 0 j =-shy 1) ()4
r~t 7gtlt ] r~ 1 ~~ ( ) ~ ) f) J ~ - 7 J J
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E jG ~jJ D i~ Sc R r l T I ~l~ I-AH T L)
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f-U 1 bull J 3 (JH 5 y 1 0 40 5J - J J J 0 lt J ) bull ~ J 0 - 5 1 () ~ (~() 5) -O _)JO I J 1 01 1
5 1t1 ~ 4) 5 C - ) J ) (jbull J
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~~ (4- 3 bull jJ 0 I 5 1 O ~
r~ 4 middot ~3 Jri middot1 SI 1 J - 4j)O - JI30 -~ -+ -~
bull J 3 Q 1 5 1 0 -)) 0 - ~) J ) 0 ~ j3 ~1t1 1 5 f 1 O ~ 4(50-)330 ) + 7 middotJJ nd 1 5 1 O~ 4 Q - ) - () j J ) 1- 4 t3 middotjJ ]H 1 c 1 O~ (~O) J - ) 3 30
P- 2 7 01 ~ 2 S 4() ~c - 2J 70
4)t) Jj ) rl J 1 u x 4 j ) Cl- j ) () 1
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(Jf-3~J-J4 42
J ~gt~ r) - J bull 4 t
1 L 7j1-l21
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1=- r S I lt r ~ J 1J ~l I f)j( - ~ - l
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C~2 D VA I47 ~ O~
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RI1 6 D3I~ o~- 21 ~
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0-lt
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1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
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bull ( 2
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2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
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ltgt lOuf 2~v
( tOuf 25V
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r- -shy -- I AI ~-- --61
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bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
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bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
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IfU ~_NJCI
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~- middot~~~t Jd MpoundM IDIIO -amp u shy
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SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
03041
UNBALANCED LINE INPUT
Used only when one amplifieris driven from one source
600 ohm LOAD
Source
A 600 ohm terminating resistor must be added to its octal plug
Between pin 1 and pin 6
NOTE Terminating resistance is required when source is a transformer Sources other than a transformer may not need a termination
600 ohms
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
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4
I
SOUICE IISISTANCE
(1
1M
4
2
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20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
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5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
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5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
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750C ( GNOA71 IS I
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I RD 10 1 I
LJ DC I RD I I v+
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LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
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SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
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PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
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NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
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BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
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+ 10f
lce ~C ~ I N4r OA
4 middot11(
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c
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-
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4 7~~A93 a2e PS 3
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6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
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LC OUTPuf JI-_ 41~kU
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Cll 3D ~~
0 ~ I
o N
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~ 121J1973aQ51O
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o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
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r 1 bull 60 J-I J 12 fi -~ J bull -gt O J s -r) j i) 1
rlt L 1 lt -1- i i 1gt ~j ~ r) f] S shy 1 j 1 J
lt I 1 I c bull
1 ) lt
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P- 2 7 01 ~ 2 S 4() ~c - 2J 70
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=
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I
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l~1-t
j I)Luli j I R~lt
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tjlAlt 0 - 05eoP ~
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--0H~Z OA i---- --=- CLIP - O ) 2 0
l --01- 501
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004[1gt02RIGHT RS(pA~O I~I~ 41 4J( n IK
DOlaquoshylt IH~1 e
C~2 D VA I47 ~ O~
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RI1 6 D3I~ o~- 21 ~
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1( 5 02 RgtJ2shy00 LM3915
(p R h
0-lt
2 - v 1 5 (1 3 o~ 70shyL 1324shy)
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1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
03051
TERMINATING RESISTANCE CHART
How to find terminating resistance for balanced or unbalanced 600 ohm lines driving more than one amplifier
STEP A Input Impedance of Amplifiers Total Load Impedance Number of Amplifiers = of Amplifiers
STEP B Total Impedance of Amplifiers shy 600 = K (Impedance Factor) 600
STEP C (~~x 600 ohms = Load Resistor Required
EXAMPLE Input Impedance of Amplifiers = 15000 ohms Number of Amplifiers = 4
A 1~OOO =3750 ohms
B 3750-600 _ 5 25 600 -
C 1 +1 x 600 = 119 x 600 = 71429 ohms525
Closest value is 715 ohms 1 metal film resistor
Note aU amplifiers must have the same input impedance If not use formula below
1 = Total Load Impedance
_l_+-L+-L+L Zi Z2 Zgt ZIJ
EXAMPLE Four (4) Amplifiers with input impedance of 15k 30k
30k and 75k
1 = 3750 ohms
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
bull 7
bull s
4
I
SOUICE IISISTANCE
(1
1M
4
2
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20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
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1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
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9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
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(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
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I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
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BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
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BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
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(p R h
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+v 0
CLI P D ~2~
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1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
03501-1
STEREO OUTPUT CONNECTIONS
Two sets of five-way binding posts on the rear panel serve as output connectors with one black and one red binding post for each channel Left channel leads go to the binding posts marked LEFT right channel to those marked RIGHT
Output leads are best connected to the amplifier with standard banana plugs however the five-way action of the binding posts permits the use of tinned wires or spade lugs
Make certain that the speakers are properly phased Connect the black or minus (-) terminal on the speaker cabinet to the appropriate black binding post on the amplifier Connect the red or plus (+) terminal to the red binding post Check to see that the stereo-mono switch on the rear of the amplifier is in the stereo position
SPEAKER PROTECTiON
AU speakers can be damaged by having too much power applied to them Fuse protection is an effective and inexpensive way of preventing this from occurring If your speaker system does not contain a fuse or a circuit breaker a fuse should be placed in series with each speaker and the wire going to the red terminal on the rear of the amplifier
Maximum protection can be obtained with fast-acting fuses Use the value recommended by the manufacturer If no value is specified use the chart provided to select the correct value (MFRM-03530)
To use the chart take a straightedge such as a ruler and line up the speakers impedance with its peak music power rating The proper fuse value can then be read from the center column Choose a fuse that is closest to and below the value indicated
WIRE SIZE AND DAMPING FACTOR
The high damping factor of BGW amplifiers results in a very clean bass response Excessively long and small diameter speaker wires can lower the damping factor and distort the lower frequencies A damping factor of at least 50 should be maintained to insure good audio quali ty
The relationship between wire length and diameter and damping factor can be calculated using the chart (MFRM-035l0) on the following page Proceed as follows
1 Using a straight-edge line up the gauge of the speaker wire with its length Mark off the resulting source resistance where this line crosses the center column
2 Line up manufacturers impedance now be read
the source resof
istance the spe
determined aker system
in Th
step e dam
Ill ping
with factor
the can
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
bull 7
bull s
4
I
SOUICE IISISTANCE
(1
1M
4
2
bull bull 10
20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
bullbull
5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
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c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
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0 I I
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LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
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SCH~~ATIC MFR~-07~11
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I
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l~1-t
j I)Luli j I R~lt
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tjlAlt 0 - 05eoP ~
YihD ~ o~ 1j CT F
--0H~Z OA i---- --=- CLIP - O ) 2 0
l --01- 501
R)04 n
TOOK
004[1gt02RIGHT RS(pA~O I~I~ 41 4J( n IK
DOlaquoshylt IH~1 e
C~2 D VA I47 ~ O~
gt0-0 ~ ~vc gt0)1 Ie 50 3 0 tshy0511- 2 7
RI1 6 D3I~ o~- 21 ~
lt igt R~obull K 14 132 I 10 ~ e e
1( 5 02 RgtJ2shy00 LM3915
(p R h
0-lt
2 - v 1 5 (1 3 o~ 70shyL 1324shy)
+v 0
CLI P D ~2~
IIIIt[J$ ~r-sl SKCV8I 8GwSVSTEMS 13130 SC1I1HYUj(ON AVE
1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
03501-2
The impedance of a speaker system can be approximated by measuring the resistance across the speaker terminals with the amplifier disconnected Multiplying this result by 133 gives you the approximate impedance
Note This method cannot be used with electrostatic speakers
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
bull 7
bull s
4
I
SOUICE IISISTANCE
(1
1M
4
2
bull bull 10
20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
bullbull
5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
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c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
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4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
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Cll 3D ~~
0 ~ I
o N
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~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
C I I IJ Ui- 1 5 1 D I PPE D T 1 J TAL 1)1 0221)-OU10 C~ 220Jpc I K J ~) [ S C C f rlt AI Ie 0100-1)220 CJ 5ltJIJF 1 2 V LECT0-JLfTIC Ct 5 6- 0 J 50 C J47U F 251 0lSC C~~~~[C () 12 J-O J I (
C j4UF ~lt-j l J [ iC CC~A ~ l C OIL ) - 0 ) 4 7
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C I (J 0 gt10 500V L) [-pcu 11 C A O]nO -O I JO
CJ 4(r= I K J u IC CcRAIC o t 0 l -OU 47 cJ bull J OJ )F I v DISC C~JII L OIOO-OJCl5
cia 120~F Suov OIPP2~ MICA U)iO-Ol0
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C 1 i IUI ~51 GISC c ylt ~I[C O J ) q-IJIOJ
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f-U 1 bull J 3 (JH 5 y 1 0 40 5J - J J J 0 lt J ) bull ~ J 0 - 5 1 () ~ (~() 5) -O _)JO I J 1 01 1
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P- 2 7 01 ~ 2 S 4() ~c - 2J 70
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2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
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07 tN4()()4
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t~1(
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bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
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rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
IL
LOAD IISISTANCE
11
40
lO
20
so
20IJ
10
5 10
bull 2
bull 7
bull s
4
I
SOUICE IISISTANCE
(1
1M
4
2
bull bull 10
20
ANNEALED COPPEI
WIlE (AW
-2624
-10
- --
2
-0-00 ~oooo
IL
I
DAMPING
ACTO
ISO 2
100
(1000 ft1
1000
1000
JOG
2-CON
CAlLI (f_fl
2000
5000
bullbull
5
1
05
01
EXAMPLE RL = 8Sl RS = 04Sl OR vF = 200 CABLE LENGTH OF 20 FT ANSWER flO WIRE
SOURCE RESISTANCE AND DAMPING FACTOR VS LENGTH AND SIZE OF OUTPUT LEADS
MFRM - 03510
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
-----4 - 10V
c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
~ I (El
LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
C I I IJ Ui- 1 5 1 D I PPE D T 1 J TAL 1)1 0221)-OU10 C~ 220Jpc I K J ~) [ S C C f rlt AI Ie 0100-1)220 CJ 5ltJIJF 1 2 V LECT0-JLfTIC Ct 5 6- 0 J 50 C J47U F 251 0lSC C~~~~[C () 12 J-O J I (
C j4UF ~lt-j l J [ iC CC~A ~ l C OIL ) - 0 ) 4 7
c) 3jPF IOUV gt10 t) I[Cl (01) J - OJ]O
C I (J 0 gt10 500V L) [-pcu 11 C A O]nO -O I JO
CJ 4(r= I K J u IC CcRAIC o t 0 l -OU 47 cJ bull J OJ )F I v DISC C~JII L OIOO-OJCl5
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~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
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07 tN4()()4
tN4004
t~1(
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N4004
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( tOuf 25V
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5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
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1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
4 5 400
300
5
4
2003
150
100 10
1 60
9 1 40
10 30
12 206
15 PEAK MUSIC
14 ~
16 4 10 POWER 1 (watt
3 620
42 25 3
15
30 2
U1
1010
SPEAKER Z FUSE SPEAKER (allma) (am)
EXAMPLE 2 = 8n PEAK POWER 150W ANSWER FUSE = 2 AHPS
FUSE SELECTOR NOHOGRAPH FOR LOUDSPEAKER PROTECTIO N
MFRM -03530
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
-----4 - 10V
c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
~ I (El
LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
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C I (J 0 gt10 500V L) [-pcu 11 C A O]nO -O I JO
CJ 4(r= I K J u IC CcRAIC o t 0 l -OU 47 cJ bull J OJ )F I v DISC C~JII L OIOO-OJCl5
cia 120~F Suov OIPP2~ MICA U)iO-Ol0
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=
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~ 10I ~ 3 J -gt 1lt 1(501 W 0 ~W DI8-12 ~ ~ LM3J15 I- Q5Z 3
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I
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l~1-t
j I)Luli j I R~lt
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tjlAlt 0 - 05eoP ~
YihD ~ o~ 1j CT F
--0H~Z OA i---- --=- CLIP - O ) 2 0
l --01- 501
R)04 n
TOOK
004[1gt02RIGHT RS(pA~O I~I~ 41 4J( n IK
DOlaquoshylt IH~1 e
C~2 D VA I47 ~ O~
gt0-0 ~ ~vc gt0)1 Ie 50 3 0 tshy0511- 2 7
RI1 6 D3I~ o~- 21 ~
lt igt R~obull K 14 132 I 10 ~ e e
1( 5 02 RgtJ2shy00 LM3915
(p R h
0-lt
2 - v 1 5 (1 3 o~ 70shyL 1324shy)
+v 0
CLI P D ~2~
IIIIt[J$ ~r-sl SKCV8I 8GwSVSTEMS 13130 SC1I1HYUj(ON AVE
1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
03650
MONO OPERATION
The output power of the amplifier can be increased by operating it in the mono (bridged) mode The correct procedure for mono operation is as follows
1 Set Stereomono switch to mono position
2 Use left channel input only DO NOT use the right channel input
3 Connect the output across the two red binding posts DO NOT use the black binding posts DO NOT reference the load (speaker) to ground Designate the left channel red binding post (+) and the right channel red binding post minus (-) Fuses when necessary should be placed in series with one red binding post
- shy - shy -shy ---Tshy --- shy -I R L I
R I I L I
copy I II copy copy I- t I- ~ I
0 ~iIMONO I I
NOTE Minimum load impedance for mono operation should be 8 ohms
CIRCUIT DESCRIPTION
In the mono mode the output of the left channel is fed into the inverting input of the right channel The two channels work opposite each other when one goes positive the other goes negative thus doubling the output voltage swing The single output is referenced between the two red binding posts
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
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4 7~~A93 a2e PS 3
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1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
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1 SIGGND
I 10
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o N
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~ 121J1973aQ51O
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o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
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2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
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2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
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N4004
ltgt lOuf 2~v
( tOuf 25V
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bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
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I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
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rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
04000
POWER MAINS CONNECTIONS
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after aU other connections have been made
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products supplied for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see POWER MAINS VOLTAGE CONVERSION
A molded standard in be replaced follows
parallel blade U-ground plug the United States and Canada
with the correct connector
is For
The
supplied use elsewhcolor-code
This connector ere the plug of the cord
mis
is ust as
HI (switched Leg) - Brown (or Black) LO (neutral Leg) - Blue (or White) EARTH (chassis ground) - Green with Yellow tracer (or Green)
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
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c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
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0 I I
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0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
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SCH~~ATIC MFR~-07~11
- PAC I FJ R
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cia 120~F Suov OIPP2~ MICA U)iO-Ol0
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~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
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tN4004
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N4004
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PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
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rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
05100
OPERATION
PROCEDURES
After all connections have been made to the power amplifier turn the gain controls fully counter-clockwise (off) Turn on the preamplifier then turn on the power amplifier The two IDLE LEDs on the 750B or the pilot light on the 750C should light If they do not check to see that the amplifier is plugged in to a live power outlet
With the preamplifier gain controls fully off advance the left and right power amplifier gain controls about half way clockwise (slot in knob facing upwards) There should be no audible hum if hum is heard check the connections between the power amplifier and preamplifier Now advance the preamplifier gain controls until the desired maximum volume is achieved Should the preamplifier gain control be in excess of the 3~ setting decrease it to half volume and increase the gain controls of the power amplifier to the desired level
The meter calibration of the 750B can be adjusted to read correctly with ~ or 8 ohm loads The calibration switch is located on the rear of the amplifier If full
power output is unobtainable check to see that the preamplifier is capable of producing the required driving voltage as stated in the Specifications Section
The amplifier incorporates a time delay network and a relay which connects the speakers only after the amplifier has stabilized thus eliminating transients
Often turn-on transients originate in the pre-amp or tuner This is especially true of tube-type units If this situation arises turn the amplifier on after the other units have had adequate time to stabilize
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
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5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
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LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
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(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
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I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
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8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
-----4 - 10V
c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
~ I (El
LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
C I I IJ Ui- 1 5 1 D I PPE D T 1 J TAL 1)1 0221)-OU10 C~ 220Jpc I K J ~) [ S C C f rlt AI Ie 0100-1)220 CJ 5ltJIJF 1 2 V LECT0-JLfTIC Ct 5 6- 0 J 50 C J47U F 251 0lSC C~~~~[C () 12 J-O J I (
C j4UF ~lt-j l J [ iC CC~A ~ l C OIL ) - 0 ) 4 7
c) 3jPF IOUV gt10 t) I[Cl (01) J - OJ]O
C I (J 0 gt10 500V L) [-pcu 11 C A O]nO -O I JO
CJ 4(r= I K J u IC CcRAIC o t 0 l -OU 47 cJ bull J OJ )F I v DISC C~JII L OIOO-OJCl5
cia 120~F Suov OIPP2~ MICA U)iO-Ol0
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C17 2~OlJoF 500v D ISC C~~A~IC )0 middot 0 - 2-gt00 C I 3 IUF 100V O I P)iC) middotIYL K U 3~ )- 0 1 00
C 1 i IUI ~51 GISC c ylt ~I[C O J ) q-IJIOJ
C~O IJO ~F I KV OIC CEFH~IC Ol ()0-1000 CLI bull [ 7 J F 1 ) 0 V LJ I gt D E D ( L A Flt I () ~ C ]r q -O middotI 71
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lKV J [ SC ~RA ~ I C J [ J J - 1 ) l (
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I T t lt0 T ) c r C) [T
Ie 1
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J c J t J 1gt 1 r r ~ j I J T gt 1
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~ lG W f) 5~fl igt TI P A~ I 4)
OJ J E 7 2 IJ I P ~ T ~ 0 i I j r R 1 5 4-0120
0 middot ~f-S91 p r ~ AJiljT ] r~ lCjSJ- u C93
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8 7 SJ707 r middotJJ r~A Ns rgtr 1 3 5 3-74 ) 7
Cd c SJ73)4 ~ rgt T -IA IgtI ~ i JI t l 4-73 j
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middot 3 ~) J ri1 ~ 0 1 J ~ rl C ~ ) - 3 i 0 ~~
~ 4 7 JH 1211 5 ~ S ) u -41J2 ~ I v 0 l rl A 1 ~ gt J () fJ 5 - 1 0 ) 2shy
~ J l K 1 h l 1 ~ ~ ~~ fJ 5 -4l0J
r 1 bull 60 J-I J 12 fi -~ J bull -gt O J s -r) j i) 1
rlt L 1 lt -1- i i 1gt ~j ~ r) f] S shy 1 j 1 J
lt I 1 I c bull
1 ) lt
rJJO
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SO ( shy
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~lt ~ I i 0 J --1 12 J ~ S t) V ) shy C )0 1
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1 1 2
lt -= -1 1~ J
I
r I
5 r ~ ) -=) - I r shyc I S~ C i J r ~
lt -- shy I ~ A r r -
q~j 1 ~j ~ J ~ bullbull 1 2 1 - 0 j =-shy 1) ()4
r~t 7gtlt ] r~ 1 ~~ ( ) ~ ) f) J ~ - 7 J J
gtJ V S Y S T = S bull I 1 C bull 07220-3
E jG ~jJ D i~ Sc R r l T I ~l~ I-AH T L)
i G 7 1 J Ilt Cl ~ 1 1 2 ~ ) ~ 500S -I J0 4 ~) ~~ 1 JK 0-11 1 2 J) 50 G) -lu04J
~ ~ l 1 O~ J H 1 2 S SO ()5 -I U05 fUO 4 7 lt J ~t 1 ~ ~ S 0 00) -1 005
j 1 2 7 J r-tv 1 v 5 () J S - 7 J 2 ~J 2 2 7 lt-- J1 1 c gt00) -27) 2 r~ J J 4 bull 7 lt J 1 r 1 L I 50J 5 -4 7 O~ ( - 4 1 ) 0 0 ~ 1 211 50 5 -l u~2
~ yi 1 ) I) O~ 12 gt) 5005-1J()L lt j ) 2 bull 7 Jrl ~ 12 =s~~ t 0 2 ) - 2 J 7 0 ~J 7 2 7 G --i ~ 2 ~ gt ~ 402 ) - 2 0 7 )
f-U 1 bull J 3 (JH 5 y 1 0 40 5J - J J J 0 lt J ) bull ~ J 0 - 5 1 () ~ (~() 5) -O _)JO I J 1 01 1
5 1t1 ~ 4) 5 C - ) J ) (jbull J
~l I middot J 3 Qt-i ~-I ) 1 n ~ 4()0-0330 1 ~l 2 47JIlt -1 middot112 bull SOJl -47i 2
~~ (4- 3 bull jJ 0 I 5 1 O ~
r~ 4 middot ~3 Jri middot1 SI 1 J - 4j)O - JI30 -~ -+ -~
bull J 3 Q 1 5 1 0 -)) 0 - ~) J ) 0 ~ j3 ~1t1 1 5 f 1 O ~ 4(50-)330 ) + 7 middotJJ nd 1 5 1 O~ 4 Q - ) - () j J ) 1- 4 t3 middotjJ ]H 1 c 1 O~ (~O) J - ) 3 30
P- 2 7 01 ~ 2 S 4() ~c - 2J 70
4)t) Jj ) rl J 1 u x 4 j ) Cl- j ) () 1
-(j 1 1 bull -1lt J I iv 1 2 5 Jl J5-1 middot102
~ )2 1 -ilt J middot1 1 2middot S ~ 5 0 u 5 - 1 - 0 2 j3 1 - I) 0 I 1 2 s gtOO)-IJ02
(Jf-3~J-J4 42
J ~gt~ r) - J bull 4 t
1 L 7j1-l21
r S JLAT JQ )1-4JJL ) i_ I ~ 0 7 2 - 3j41
1=- r S I lt r ~ J 1J ~l I f)j( - ~ - l
2 LJC L l q - J I t 1 322 - )() 1 )
- lt) A 3 -gtCi - 1gt ~H lL C 4f) 211 5 - 2) 75
4 () - 1 gt ~ J rH I I ) ) H l L C ) 2 1~ C) -31 5v
Ij- J c j -( middots gtLJ T CI) 22 d~ -3u 2)
j 1 r- h J If j gt 1 J 2 - () ) r) (
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T j 1
T 2 SilTCt T-i C ~ 1 lt L
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---~~ ~ Iftl
~~ I I IDLE Fi R51S
C W I I 508 -0
o gtCo1-i~
1
Imiddot1gtt1 ~~ bull r 0 I I 1~1j8
k ~O I -- -33Z ) t B 7 C bull 000
J-Ficooi Ie j03 r-~e -4 T
o~o
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=
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~ 10I ~ 3 J -gt 1lt 1(501 W 0 ~W DI8-12 ~ ~ LM3J15 I- Q5Z 3
pound0 +15V
50
I
--F R ZtII ~fGRIEN _ 0 j Z2 lO rlt
l~1-t
j I)Luli j I R~lt
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tjlAlt 0 - 05eoP ~
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004[1gt02RIGHT RS(pA~O I~I~ 41 4J( n IK
DOlaquoshylt IH~1 e
C~2 D VA I47 ~ O~
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RI1 6 D3I~ o~- 21 ~
lt igt R~obull K 14 132 I 10 ~ e e
1( 5 02 RgtJ2shy00 LM3915
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0-lt
2 - v 1 5 (1 3 o~ 70shyL 1324shy)
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1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
06200-1
750 BC CIRCUIT DESCRIPTION
AMPLIFIER
The input signal from pin 9 of J 1 is applied to the inverting input (pin 2) of op amp IC 1 through the coupling network C 1 C2 R 1 and R3 This network provides a high input impedance to the amplifier and filters out DC and radio frequency interference
Q 1 and Q2 divide the signal into positive and negative components respectively They are connected common emitter and provide voltage gain Q8 and Q9 are connected common collector to provide the current gain necessary to drive the driver transistors QIO and Qll QIO and Qll drive the output stage Q12-Q21 The output appears across flyback clipping diodes CR5 and CR6 then passes through compensation networks L 1R49 and R50C 19 to appear at pins 1 and 2 of J1
To maintain overall amplifier stability linearity and low distortion degenerative feedback is used throughout the amplifier Voltage divider R6R2 applies the correct amount of feedback to the non-inverting input (pin 3) of op amp ICi Except for the input the amplifier uses direct coupling throughout
Q3 is a Vbe multiplier and provides bias voltage for all operating temperature changes
Q22-Q24 comprise the clipping indicator circuit When the amplifier is driven into clipping a voltage of sufficient magnitude to turn on Q22 appears at pin 6 of IC 1 and is coupled to the base of Q22 through R 10 and C9 This voltage appears because the amplifier is trying to compensate for the fact that the clipped feedback signal does not match the undipped input signal When Q22 turns on the base of Q24 is driven positive through RI8 so Q24 turns on This turns on the LED clipping indicator and pulls the base of Q23 negative through R30 and C21 which shuts off Q23 As long as Q23 is off the base of Q24 is not held negative through R26 and Q23 so Q24 stays on As C2 i charges through R29 the base of Q23 becomes positive until Q23 turns on which shuts off Q24 and the LEO Thus the length of time that the LED is held on is determined by R29 and C21
RELAY CARD
The relay card serves two purposes disconnects the speaker load when it dSpeaker Protection Time Chart 05400
It provides the intitial etects DC at either ou
turn-on tput channel
delay and See
TIME DELAY
12 V AC connected to P61 and 73 rectified by D I-D4 and filtered by C 1 and C2 C5 charges through R6 and turns on Q2 about 1 second after the amplifier is turned on Q2 turns on relay K 1 which connects the loads to the amplifier outputs When the amplifier is turned off C5 discharges through D6 and R2 to the -77V supply
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
-----4 - 10V
c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
~ I (El
LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
C I I IJ Ui- 1 5 1 D I PPE D T 1 J TAL 1)1 0221)-OU10 C~ 220Jpc I K J ~) [ S C C f rlt AI Ie 0100-1)220 CJ 5ltJIJF 1 2 V LECT0-JLfTIC Ct 5 6- 0 J 50 C J47U F 251 0lSC C~~~~[C () 12 J-O J I (
C j4UF ~lt-j l J [ iC CC~A ~ l C OIL ) - 0 ) 4 7
c) 3jPF IOUV gt10 t) I[Cl (01) J - OJ]O
C I (J 0 gt10 500V L) [-pcu 11 C A O]nO -O I JO
CJ 4(r= I K J u IC CcRAIC o t 0 l -OU 47 cJ bull J OJ )F I v DISC C~JII L OIOO-OJCl5
cia 120~F Suov OIPP2~ MICA U)iO-Ol0
C I I 2 v U~ I 0 ) 1 c L fO C T ( (J L Y rI C 04J 5 - 002ll C I 2 2 lf- I)JV F L fC T rilJLYTIC 0( j6-0(2 0 C 1 3 I ~OP F scav O[gtPEO ~[ CA 01))0 -0120 CI4 lL O~F 5uOV DI~PcD MICA 0 ) 0 -0120 CI S IUr l5v U[SC CLHAlpoundC 0 1 29-010 0 CII) 2~OJPF S00V DISC (E-A~ I C 0C) I()-2500
C17 2~OlJoF 500v D ISC C~~A~IC )0 middot 0 - 2-gt00 C I 3 IUF 100V O I P)iC) middotIYL K U 3~ )- 0 1 00
C 1 i IUI ~51 GISC c ylt ~I[C O J ) q-IJIOJ
C~O IJO ~F I KV OIC CEFH~IC Ol ()0-1000 CLI bull [ 7 J F 1 ) 0 V LJ I gt D E D ( L A Flt I () ~ C ]r q -O middotI 71
IU r=
lUi-
IJ OJ0F
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lKV J [ SC ~RA ~ I C J [ J J - 1 ) l (
C ( 1 l ( 7 4 I ) J L T L ~ r r~ 1 ) ) ) - 14 J
C~ 2 4 74J A [ oj vJLT Lgttr lJ uQ - 4 14 )
CJ [ 4 I ~ 1 J [ Sd r C 1 loj C ) ) LI
C~4 l bull 4 1 4i _) I S [ T C 1 I G ) I J- co ~ J J 0 - 1 ( G
Clt) [ 1400 ) )() -4lJ ()
I ~v o A ~ ~O ) ) G I) -ij04
C ( r 1 )i) - 474J
I T t lt0 T ) c r C) [T
Ie 1
I J E )O) ) 1~ r ~ ~J cgt r T- ( [ 1 - ) I SO
J c J t J 1gt 1 r r ~ j I J T gt 1
~ G -I S Y S I L S bull bull c bull 07220-2
~ lG W f) 5~fl igt TI P A~ I 4)
OJ J E 7 2 IJ I P ~ T ~ 0 i I j r R 1 5 4-0120
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]j J E 3 4 J P ~ T ) A l J r J t-~ 1--j~ 4-J3~ J
Ci ~ J=J5 rJ i I P A middot l gt gt) 1 3~3-~)3Su
r l I 0 5J7394 rj TP JS [ T J i l 1 -3 )4-7394 () 1 1 SJ7G7 pcJ Tql ~ [jr] l 1 j ) ] - 7 0 7
Q I2 5J7J9(~ i P T~ AIJ [ j T J~ I ~J ~ -7j r 4
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01 SJ7j ) 1 rPi T ~lSILJ I l L 4 - ] 9 4
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) I ~~ S7J 9 -+ P I R A ~J S [JI -I I ~ J4-7j9
8 7 SJ707 r middotJJ r~A Ns rgtr 1 3 5 3-74 ) 7
Cd c SJ73)4 ~ rgt T -IA IgtI ~ i JI t l 4-73 j
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J () S J 7 ] 9 4 ~ ~) j T A i [ I U ltshy 1 J ) 4 - 7 J ~
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1lt 1middot i 1 2 ~
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-lt J
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I
J
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middot 3 ~) J ri1 ~ 0 1 J ~ rl C ~ ) - 3 i 0 ~~
~ 4 7 JH 1211 5 ~ S ) u -41J2 ~ I v 0 l rl A 1 ~ gt J () fJ 5 - 1 0 ) 2shy
~ J l K 1 h l 1 ~ ~ ~~ fJ 5 -4l0J
r 1 bull 60 J-I J 12 fi -~ J bull -gt O J s -r) j i) 1
rlt L 1 lt -1- i i 1gt ~j ~ r) f] S shy 1 j 1 J
lt I 1 I c bull
1 ) lt
rJJO
4 7 1lt
J r 1 12
0 1 1 2
I 2 H ~ ~~
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gt ~
gt 0 ) S shy
) IJ J 5 shy
SO ( shy
1 ~ J - J - C L
I 7 f) J
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1 )0
1 1 J
I) 1 ~
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1 gt
J bull
5(0 )-1002
) i ) 0- 11 () 1 OJ I j 1 L C lt t 1 12 C ~
~ bull9 I J C i 1 5 5 ) Jc-lIJOS pJ 1 u 0 LJ r1 1 12 i gt J u -)- 1 102
~lt ~ I i 0 J --1 12 J ~ S t) V ) shy C )0 1
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C J
- _t I 0 r
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1 1 2
lt -= -1 1~ J
I
r I
5 r ~ ) -=) - I r shyc I S~ C i J r ~
lt -- shy I ~ A r r -
q~j 1 ~j ~ J ~ bullbull 1 2 1 - 0 j =-shy 1) ()4
r~t 7gtlt ] r~ 1 ~~ ( ) ~ ) f) J ~ - 7 J J
gtJ V S Y S T = S bull I 1 C bull 07220-3
E jG ~jJ D i~ Sc R r l T I ~l~ I-AH T L)
i G 7 1 J Ilt Cl ~ 1 1 2 ~ ) ~ 500S -I J0 4 ~) ~~ 1 JK 0-11 1 2 J) 50 G) -lu04J
~ ~ l 1 O~ J H 1 2 S SO ()5 -I U05 fUO 4 7 lt J ~t 1 ~ ~ S 0 00) -1 005
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f-U 1 bull J 3 (JH 5 y 1 0 40 5J - J J J 0 lt J ) bull ~ J 0 - 5 1 () ~ (~() 5) -O _)JO I J 1 01 1
5 1t1 ~ 4) 5 C - ) J ) (jbull J
~l I middot J 3 Qt-i ~-I ) 1 n ~ 4()0-0330 1 ~l 2 47JIlt -1 middot112 bull SOJl -47i 2
~~ (4- 3 bull jJ 0 I 5 1 O ~
r~ 4 middot ~3 Jri middot1 SI 1 J - 4j)O - JI30 -~ -+ -~
bull J 3 Q 1 5 1 0 -)) 0 - ~) J ) 0 ~ j3 ~1t1 1 5 f 1 O ~ 4(50-)330 ) + 7 middotJJ nd 1 5 1 O~ 4 Q - ) - () j J ) 1- 4 t3 middotjJ ]H 1 c 1 O~ (~O) J - ) 3 30
P- 2 7 01 ~ 2 S 4() ~c - 2J 70
4)t) Jj ) rl J 1 u x 4 j ) Cl- j ) () 1
-(j 1 1 bull -1lt J I iv 1 2 5 Jl J5-1 middot102
~ )2 1 -ilt J middot1 1 2middot S ~ 5 0 u 5 - 1 - 0 2 j3 1 - I) 0 I 1 2 s gtOO)-IJ02
(Jf-3~J-J4 42
J ~gt~ r) - J bull 4 t
1 L 7j1-l21
r S JLAT JQ )1-4JJL ) i_ I ~ 0 7 2 - 3j41
1=- r S I lt r ~ J 1J ~l I f)j( - ~ - l
2 LJC L l q - J I t 1 322 - )() 1 )
- lt) A 3 -gtCi - 1gt ~H lL C 4f) 211 5 - 2) 75
4 () - 1 gt ~ J rH I I ) ) H l L C ) 2 1~ C) -31 5v
Ij- J c j -( middots gtLJ T CI) 22 d~ -3u 2)
j 1 r- h J If j gt 1 J 2 - () ) r) (
b - J~ A l -t r- i L ( - jl T ~c) ~Q_ gt -~ 0
SJ t ~~ ~ bull 1 ) i bull - ~) -( bull 1 J ~ ~f~ )~- -) l tJ
T j 1
T 2 SilTCt T-i C ~ 1 lt L
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---~~ ~ Iftl
~~ I I IDLE Fi R51S
C W I I 508 -0
o gtCo1-i~
1
Imiddot1gtt1 ~~ bull r 0 I I 1~1j8
k ~O I -- -33Z ) t B 7 C bull 000
J-Ficooi Ie j03 r-~e -4 T
o~o
0312- 2 7 shyLEFT C )0(0 Rl17If ~ c -V
=
vvvv
Oll~~t-l -2 1 - ~~00O l 0 1~W -15 y 2VRgtIIJR
~ 10I ~ 3 J -gt 1lt 1(501 W 0 ~W DI8-12 ~ ~ LM3J15 I- Q5Z 3
pound0 +15V
50
I
--F R ZtII ~fGRIEN _ 0 j Z2 lO rlt
l~1-t
j I)Luli j I R~lt
-) -J 024
tjlAlt 0 - 05eoP ~
YihD ~ o~ 1j CT F
--0H~Z OA i---- --=- CLIP - O ) 2 0
l --01- 501
R)04 n
TOOK
004[1gt02RIGHT RS(pA~O I~I~ 41 4J( n IK
DOlaquoshylt IH~1 e
C~2 D VA I47 ~ O~
gt0-0 ~ ~vc gt0)1 Ie 50 3 0 tshy0511- 2 7
RI1 6 D3I~ o~- 21 ~
lt igt R~obull K 14 132 I 10 ~ e e
1( 5 02 RgtJ2shy00 LM3915
(p R h
0-lt
2 - v 1 5 (1 3 o~ 70shyL 1324shy)
+v 0
CLI P D ~2~
IIIIt[J$ ~r-sl SKCV8I 8GwSVSTEMS 13130 SC1I1HYUj(ON AVE
1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
06200-2
SPEAKER PROTECTION
R7 and R9 couple the amplifier outputs through isolation network D9 10 11 14 If either or both amplifier channels short to the negative supply the base of Q2 is held negative through R5C5 turning off Q2 and K 1 and disconnecting the speaker load If either or both amplifier channels short to the positive supply Q3 is turned on through R 10C06 and this pulls the base of Q2 to zero turning it off
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
-----4 - 10V
c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
~ I (El
LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
C I I IJ Ui- 1 5 1 D I PPE D T 1 J TAL 1)1 0221)-OU10 C~ 220Jpc I K J ~) [ S C C f rlt AI Ie 0100-1)220 CJ 5ltJIJF 1 2 V LECT0-JLfTIC Ct 5 6- 0 J 50 C J47U F 251 0lSC C~~~~[C () 12 J-O J I (
C j4UF ~lt-j l J [ iC CC~A ~ l C OIL ) - 0 ) 4 7
c) 3jPF IOUV gt10 t) I[Cl (01) J - OJ]O
C I (J 0 gt10 500V L) [-pcu 11 C A O]nO -O I JO
CJ 4(r= I K J u IC CcRAIC o t 0 l -OU 47 cJ bull J OJ )F I v DISC C~JII L OIOO-OJCl5
cia 120~F Suov OIPP2~ MICA U)iO-Ol0
C I I 2 v U~ I 0 ) 1 c L fO C T ( (J L Y rI C 04J 5 - 002ll C I 2 2 lf- I)JV F L fC T rilJLYTIC 0( j6-0(2 0 C 1 3 I ~OP F scav O[gtPEO ~[ CA 01))0 -0120 CI4 lL O~F 5uOV DI~PcD MICA 0 ) 0 -0120 CI S IUr l5v U[SC CLHAlpoundC 0 1 29-010 0 CII) 2~OJPF S00V DISC (E-A~ I C 0C) I()-2500
C17 2~OlJoF 500v D ISC C~~A~IC )0 middot 0 - 2-gt00 C I 3 IUF 100V O I P)iC) middotIYL K U 3~ )- 0 1 00
C 1 i IUI ~51 GISC c ylt ~I[C O J ) q-IJIOJ
C~O IJO ~F I KV OIC CEFH~IC Ol ()0-1000 CLI bull [ 7 J F 1 ) 0 V LJ I gt D E D ( L A Flt I () ~ C ]r q -O middotI 71
IU r=
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J c J t J 1gt 1 r r ~ j I J T gt 1
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~ lG W f) 5~fl igt TI P A~ I 4)
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~ 4 7 JH 1211 5 ~ S ) u -41J2 ~ I v 0 l rl A 1 ~ gt J () fJ 5 - 1 0 ) 2shy
~ J l K 1 h l 1 ~ ~ ~~ fJ 5 -4l0J
r 1 bull 60 J-I J 12 fi -~ J bull -gt O J s -r) j i) 1
rlt L 1 lt -1- i i 1gt ~j ~ r) f] S shy 1 j 1 J
lt I 1 I c bull
1 ) lt
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1 1 2
lt -= -1 1~ J
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r I
5 r ~ ) -=) - I r shyc I S~ C i J r ~
lt -- shy I ~ A r r -
q~j 1 ~j ~ J ~ bullbull 1 2 1 - 0 j =-shy 1) ()4
r~t 7gtlt ] r~ 1 ~~ ( ) ~ ) f) J ~ - 7 J J
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E jG ~jJ D i~ Sc R r l T I ~l~ I-AH T L)
i G 7 1 J Ilt Cl ~ 1 1 2 ~ ) ~ 500S -I J0 4 ~) ~~ 1 JK 0-11 1 2 J) 50 G) -lu04J
~ ~ l 1 O~ J H 1 2 S SO ()5 -I U05 fUO 4 7 lt J ~t 1 ~ ~ S 0 00) -1 005
j 1 2 7 J r-tv 1 v 5 () J S - 7 J 2 ~J 2 2 7 lt-- J1 1 c gt00) -27) 2 r~ J J 4 bull 7 lt J 1 r 1 L I 50J 5 -4 7 O~ ( - 4 1 ) 0 0 ~ 1 211 50 5 -l u~2
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f-U 1 bull J 3 (JH 5 y 1 0 40 5J - J J J 0 lt J ) bull ~ J 0 - 5 1 () ~ (~() 5) -O _)JO I J 1 01 1
5 1t1 ~ 4) 5 C - ) J ) (jbull J
~l I middot J 3 Qt-i ~-I ) 1 n ~ 4()0-0330 1 ~l 2 47JIlt -1 middot112 bull SOJl -47i 2
~~ (4- 3 bull jJ 0 I 5 1 O ~
r~ 4 middot ~3 Jri middot1 SI 1 J - 4j)O - JI30 -~ -+ -~
bull J 3 Q 1 5 1 0 -)) 0 - ~) J ) 0 ~ j3 ~1t1 1 5 f 1 O ~ 4(50-)330 ) + 7 middotJJ nd 1 5 1 O~ 4 Q - ) - () j J ) 1- 4 t3 middotjJ ]H 1 c 1 O~ (~O) J - ) 3 30
P- 2 7 01 ~ 2 S 4() ~c - 2J 70
4)t) Jj ) rl J 1 u x 4 j ) Cl- j ) () 1
-(j 1 1 bull -1lt J I iv 1 2 5 Jl J5-1 middot102
~ )2 1 -ilt J middot1 1 2middot S ~ 5 0 u 5 - 1 - 0 2 j3 1 - I) 0 I 1 2 s gtOO)-IJ02
(Jf-3~J-J4 42
J ~gt~ r) - J bull 4 t
1 L 7j1-l21
r S JLAT JQ )1-4JJL ) i_ I ~ 0 7 2 - 3j41
1=- r S I lt r ~ J 1J ~l I f)j( - ~ - l
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C W I I 508 -0
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I
--F R ZtII ~fGRIEN _ 0 j Z2 lO rlt
l~1-t
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DOlaquoshylt IH~1 e
C~2 D VA I47 ~ O~
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RI1 6 D3I~ o~- 21 ~
lt igt R~obull K 14 132 I 10 ~ e e
1( 5 02 RgtJ2shy00 LM3915
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0-lt
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1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
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01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
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r- -shy -- I AI ~-- --61
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bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
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I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
OM --- (if USoI I r 50 B HRr II r I CALIBRATION I
I I I I 4 0 HS l ORN
a ND- ----6~ TEL I~middot RS II nI P6~~HL I I ~80K I ~) ~)I l ORN R1 I R6 RIGHT l T
5 4 1 ~~---------------l S 3 iI r OAN I 1 2 1( 1~K I Y[ L J8 OUTPUT Jo OUTPUT
I T IA R8 JI r-- r-- I ~ J11 LEFTI P64 ~ 8RN I R O 1 c SOK BRNI S HRE O Pt-l UNBALANCED
9017 - 125 1 P65 I BRN I UK I BRN r- INPUT I RELAY Pc BD I GRN 8 0HH5 R9 rH
P66-1- L ____ --s~~ 2 1 I OUTPUT J1 rlI GRN ORN I III P6 ) 4 WH T I P12 -4 Belt WHT 41 I vshy 2 1 lt I
~f- P11 P)O1 BLK S IwHT I 1Ic db lEf TI R-- ~ I I G GNDP-ltf- P6 0 IClIPP6 14 Y RED 6 1 I ~S~F s I I ~NL __ _ __ --l I
(NC) ~ I USE DJS (N C)~ ri 81 I
750C ( GNOA71 IS I
~II t-+lt~ lR ON 9 SIG INP UT Gr4lt I+CltI I
I RD 10 1 I
LJ DC I RD I I v+
J 5LJ rl eLK teL
I ~ I l EFBlK~ I BAltN( ( OLK Bl KJ ~ INPUT
LJ~ V+ (15V)1 gt-- -12 (R N L fAN SP H D RIGHT ~ 5 1-LEn ti s SWITCHE S
Sl - ~IG H T H S I~ I1III1II ~1N~middot11 0LEFTI~ BUlt IlilKTB TlGNO gtshy R ~C2 JZ RiGHTBl L J Sw T~~~OO llf UNBALAN(( DP1 - A INPUT~750 8 METERI
(I f US ED) CO NNECT OR GRN bull r)l1 rlI I I GRN 1) I OUT PUT11)ocl J3 LIN r- - - ~ LOAD CLIP rshy 2 1 Ii~~~t I I I~I ~lrHT-----lt ~ ~IL _ _ ~ m rpoundL ~IV- l I I lt I~IoCB
cs ~ I RI GHT 6 (i AN [
CIRCUIT I REA tlaquo R ~I GNOt L~+1 ( 3 ~~v F 5 I I ~~~URTRpoundO 6 1 I
2 t000 IJ f ~ (liP (Ne) ~ I IF USEDv71 GY~II I IBL K ~ IBRIOG INPUT
~IA7I S IGGND IORANG E G~ I~ ISI G INPUTreg
--
WI -J J UM Ppound R AM P 0 rrsOcl~5J
AED to I LJfAN ~~)I ~ L-1---shy2 EJ~ SH CHART fOR ~I v + bullr-r(l BL U (WHT) PRIMARY CONNHTlONS os iLJ
I I GRN I ~ I RI GHT GNO ~ l I BA LAN CEO iI ( lO RN (BLK) 3~ INPUT I
LJ TB LJ 01 (HAS S I S -h -shy 0
IV
8GWSYSTEMS llJO S()JT~ YUKON AlE~oUIQTClUANCIMCI - ~ ~m1~~CA~~NUHeRS SHOWN AR
TERMINAL S ON TBt ~~Iu=- ~1 AND ARE RpoundAD FROw
SCHEMATIC CHA SS IS WIRINGTOP TO BOTT O A S ~~~~CI- ~___ SA I I - REF wOD H S 750 B AND 750C TOlBNtCIOIII~ r NOJlC1IbIQIr WSR POWER AMPLIFIERSHOWN ON THI S OW Gbull MUI( ~ ucu _ l - s f[ PAIH S LI S T TBI IS LOCATE O INS IDE ~(AC( IIOUIOMtCU e f OR __~RV
I - ALL RE S I S TOR S ~ I I ZWEXC( P T AS SHOWN UNIT ON REAR PANEL
PRIMARY CONNECTI ONS vOLTA GE AC 00 20 00 2 0 0 xwfR - BAN l 2 bull bull
- AE Obull bull S bull bull S - OAN 5 bull 5 5 bull -YH l
bull GAN
x r R BLU 2
bull 2 2 2 2
bull JUM PER - ORN 2 - NON[ HO NE HON( 1 MFRM- 0730~
NOTES UNLf~ OHtfAWISEsPEOf-IED __SCAL[ O Sft[CT I 01 t
~~r-
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
-----4 - 10V
c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
~ I (El
LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
C I I IJ Ui- 1 5 1 D I PPE D T 1 J TAL 1)1 0221)-OU10 C~ 220Jpc I K J ~) [ S C C f rlt AI Ie 0100-1)220 CJ 5ltJIJF 1 2 V LECT0-JLfTIC Ct 5 6- 0 J 50 C J47U F 251 0lSC C~~~~[C () 12 J-O J I (
C j4UF ~lt-j l J [ iC CC~A ~ l C OIL ) - 0 ) 4 7
c) 3jPF IOUV gt10 t) I[Cl (01) J - OJ]O
C I (J 0 gt10 500V L) [-pcu 11 C A O]nO -O I JO
CJ 4(r= I K J u IC CcRAIC o t 0 l -OU 47 cJ bull J OJ )F I v DISC C~JII L OIOO-OJCl5
cia 120~F Suov OIPP2~ MICA U)iO-Ol0
C I I 2 v U~ I 0 ) 1 c L fO C T ( (J L Y rI C 04J 5 - 002ll C I 2 2 lf- I)JV F L fC T rilJLYTIC 0( j6-0(2 0 C 1 3 I ~OP F scav O[gtPEO ~[ CA 01))0 -0120 CI4 lL O~F 5uOV DI~PcD MICA 0 ) 0 -0120 CI S IUr l5v U[SC CLHAlpoundC 0 1 29-010 0 CII) 2~OJPF S00V DISC (E-A~ I C 0C) I()-2500
C17 2~OlJoF 500v D ISC C~~A~IC )0 middot 0 - 2-gt00 C I 3 IUF 100V O I P)iC) middotIYL K U 3~ )- 0 1 00
C 1 i IUI ~51 GISC c ylt ~I[C O J ) q-IJIOJ
C~O IJO ~F I KV OIC CEFH~IC Ol ()0-1000 CLI bull [ 7 J F 1 ) 0 V LJ I gt D E D ( L A Flt I () ~ C ]r q -O middotI 71
IU r=
lUi-
IJ OJ0F
I OUV )[ gt)) ~YL r-lt o 3 u) - ) 1 no 10vV ij l t=-JcJ IYL r ()31)9-1OJ
lKV J [ SC ~RA ~ I C J [ J J - 1 ) l (
C ( 1 l ( 7 4 I ) J L T L ~ r r~ 1 ) ) ) - 14 J
C~ 2 4 74J A [ oj vJLT Lgttr lJ uQ - 4 14 )
CJ [ 4 I ~ 1 J [ Sd r C 1 loj C ) ) LI
C~4 l bull 4 1 4i _) I S [ T C 1 I G ) I J- co ~ J J 0 - 1 ( G
Clt) [ 1400 ) )() -4lJ ()
I ~v o A ~ ~O ) ) G I) -ij04
C ( r 1 )i) - 474J
I T t lt0 T ) c r C) [T
Ie 1
I J E )O) ) 1~ r ~ ~J cgt r T- ( [ 1 - ) I SO
J c J t J 1gt 1 r r ~ j I J T gt 1
~ G -I S Y S I L S bull bull c bull 07220-2
~ lG W f) 5~fl igt TI P A~ I 4)
OJ J E 7 2 IJ I P ~ T ~ 0 i I j r R 1 5 4-0120
0 middot ~f-S91 p r ~ AJiljT ] r~ lCjSJ- u C93
Cgt S 4 j gt I T ~ lo JC [ T lt 1 ))4 shy ] t~]
Q ) lJ 5 ~ J I ~ P ~ T ~ Al Lj I r d 1 a ~4-()U4]
)( t r5A J P Ishy 1~lo~J I JT JP 1 j~ 3-0J -~]
]j J E 3 4 J P ~ T ) A l J r J t-~ 1--j~ 4-J3~ J
Ci ~ J=J5 rJ i I P A middot l gt gt) 1 3~3-~)3Su
r l I 0 5J7394 rj TP JS [ T J i l 1 -3 )4-7394 () 1 1 SJ7G7 pcJ Tql ~ [jr] l 1 j ) ] - 7 0 7
Q I2 5J7J9(~ i P T~ AIJ [ j T J~ I ~J ~ -7j r 4
(H 3 SJ 7 J 7 f-lto r -J ~ JS I J T llf I ~l i ] - 7 0 1
01 SJ7j ) 1 rPi T ~lSILJ I l L 4 - ] 9 4
(1 1 SJ7~07 p~p r R ~ N~ jTJ ~ 1 ~3 1-7~()7
) I ~~ S7J 9 -+ P I R A ~J S [JI -I I ~ J4-7j9
8 7 SJ707 r middotJJ r~A Ns rgtr 1 3 5 3-74 ) 7
Cd c SJ73)4 ~ rgt T -IA IgtI ~ i JI t l 4-73 j
~) 1 ) S J 707 P ~gt I ) ltIgt I ~ T J ~ 1 ~J-740l
J () S J 7 ] 9 4 ~ ~) j T A i [ I U ltshy 1 J ) 4 - 7 J ~
~ ) I S J 7 -+ ~ 7 P Nf- T Q L I T J flt 1 ~l3-7()7
O~2 ) )J P r JA I I s T ul~ 1 3 3-lJ U
~ 3 J 5 A 4 J P I -lt l I j T J 1 1gt 4- 0 0 43 J~4 P 5 J i F j I ~ N ~ I -gt T j h 1 d J - f) r) 4 ]
- ~- ~ 1shy P_ s r s ru-( i
lt 1
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jh ~ 12 j~
1lt 1middot i 1 2 ~
50()S - 4 1J3 5 ) 1 - 2 I
-lt J
) 1 ~
I
- H
J ~ ~
I c d
I L J
I
J
~
gt()ui -lJOJ S ) uS - I U 0 j
~ 1 ) shy H ~ ~ 1 oJ 6 i) 2 0 - 3 () 2 R 4 7 bull shy lt n I I N UOI-45~
middot 3 ~) J ri1 ~ 0 1 J ~ rl C ~ ) - 3 i 0 ~~
~ 4 7 JH 1211 5 ~ S ) u -41J2 ~ I v 0 l rl A 1 ~ gt J () fJ 5 - 1 0 ) 2shy
~ J l K 1 h l 1 ~ ~ ~~ fJ 5 -4l0J
r 1 bull 60 J-I J 12 fi -~ J bull -gt O J s -r) j i) 1
rlt L 1 lt -1- i i 1gt ~j ~ r) f] S shy 1 j 1 J
lt I 1 I c bull
1 ) lt
rJJO
4 7 1lt
J r 1 12
0 1 1 2
I 2 H ~ ~~
-17shy
gt ~
gt 0 ) S shy
) IJ J 5 shy
SO ( shy
1 ~ J - J - C L
I 7 f) J
P S ~ 7
1 )0
1 1 J
I) 1 ~
) r ~ 12 Ii
1 gt
J bull
5(0 )-1002
) i ) 0- 11 () 1 OJ I j 1 L C lt t 1 12 C ~
~ bull9 I J C i 1 5 5 ) Jc-lIJOS pJ 1 u 0 LJ r1 1 12 i gt J u -)- 1 102
~lt ~ I i 0 J --1 12 J ~ S t) V ) shy C )0 1
~ c2
C J
- _t I 0 r
-I e -
1 1 2
lt -= -1 1~ J
I
r I
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r~t 7gtlt ] r~ 1 ~~ ( ) ~ ) f) J ~ - 7 J J
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~ ~ l 1 O~ J H 1 2 S SO ()5 -I U05 fUO 4 7 lt J ~t 1 ~ ~ S 0 00) -1 005
j 1 2 7 J r-tv 1 v 5 () J S - 7 J 2 ~J 2 2 7 lt-- J1 1 c gt00) -27) 2 r~ J J 4 bull 7 lt J 1 r 1 L I 50J 5 -4 7 O~ ( - 4 1 ) 0 0 ~ 1 211 50 5 -l u~2
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f-U 1 bull J 3 (JH 5 y 1 0 40 5J - J J J 0 lt J ) bull ~ J 0 - 5 1 () ~ (~() 5) -O _)JO I J 1 01 1
5 1t1 ~ 4) 5 C - ) J ) (jbull J
~l I middot J 3 Qt-i ~-I ) 1 n ~ 4()0-0330 1 ~l 2 47JIlt -1 middot112 bull SOJl -47i 2
~~ (4- 3 bull jJ 0 I 5 1 O ~
r~ 4 middot ~3 Jri middot1 SI 1 J - 4j)O - JI30 -~ -+ -~
bull J 3 Q 1 5 1 0 -)) 0 - ~) J ) 0 ~ j3 ~1t1 1 5 f 1 O ~ 4(50-)330 ) + 7 middotJJ nd 1 5 1 O~ 4 Q - ) - () j J ) 1- 4 t3 middotjJ ]H 1 c 1 O~ (~O) J - ) 3 30
P- 2 7 01 ~ 2 S 4() ~c - 2J 70
4)t) Jj ) rl J 1 u x 4 j ) Cl- j ) () 1
-(j 1 1 bull -1lt J I iv 1 2 5 Jl J5-1 middot102
~ )2 1 -ilt J middot1 1 2middot S ~ 5 0 u 5 - 1 - 0 2 j3 1 - I) 0 I 1 2 s gtOO)-IJ02
(Jf-3~J-J4 42
J ~gt~ r) - J bull 4 t
1 L 7j1-l21
r S JLAT JQ )1-4JJL ) i_ I ~ 0 7 2 - 3j41
1=- r S I lt r ~ J 1J ~l I f)j( - ~ - l
2 LJC L l q - J I t 1 322 - )() 1 )
- lt) A 3 -gtCi - 1gt ~H lL C 4f) 211 5 - 2) 75
4 () - 1 gt ~ J rH I I ) ) H l L C ) 2 1~ C) -31 5v
Ij- J c j -( middots gtLJ T CI) 22 d~ -3u 2)
j 1 r- h J If j gt 1 J 2 - () ) r) (
b - J~ A l -t r- i L ( - jl T ~c) ~Q_ gt -~ 0
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T j 1
T 2 SilTCt T-i C ~ 1 lt L
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C W I I 508 -0
o gtCo1-i~
1
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k ~O I -- -33Z ) t B 7 C bull 000
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=
vvvv
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pound0 +15V
50
I
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l~1-t
j I)Luli j I R~lt
-) -J 024
tjlAlt 0 - 05eoP ~
YihD ~ o~ 1j CT F
--0H~Z OA i---- --=- CLIP - O ) 2 0
l --01- 501
R)04 n
TOOK
004[1gt02RIGHT RS(pA~O I~I~ 41 4J( n IK
DOlaquoshylt IH~1 e
C~2 D VA I47 ~ O~
gt0-0 ~ ~vc gt0)1 Ie 50 3 0 tshy0511- 2 7
RI1 6 D3I~ o~- 21 ~
lt igt R~obull K 14 132 I 10 ~ e e
1( 5 02 RgtJ2shy00 LM3915
(p R h
0-lt
2 - v 1 5 (1 3 o~ 70shyL 1324shy)
+v 0
CLI P D ~2~
IIIIt[J$ ~r-sl SKCV8I 8GwSVSTEMS 13130 SC1I1HYUj(ON AVE
1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
BGW SYSTEMS INC
ENG NO DESCRIPTICN CHASSIS ASSY
CAPAC ITORS
Cl 1UF 500V eISC CERAMIC C2 21000UF 100V cLECTRULYTIC C3 2100GUF lCOV ELECTROLYTIC C4 1UF 25V DISC CERA~IC
C5 1UF 25V DISC CERAMIC
CIRCUIT BREAKER
C51 CIRCUIT 8REAKiR 15A BLK
OIODES
CRl BRIoGE RECTIFIER
~ J ~ LEOS 750C ONLY
OS1 LED REO 750C CNLY DS2 LEO RED 750C ONLY OS3 LED RED 750C ONLY
- ~ FUSES
F1 FUSE 3AG 15A
CONNECTORS
PIL PLUG 11 PIN PIR PLUG 11 P Ii~
J3 CONNECTOR 3 PARTS 2-1349-0114 J4 CCNr--IECTOR 3 PARTS 2-1349-0114 J5 CONNECTOR 3 PAR TS 2-1349-0114 J6 COfNECTOR 5 PARTS 4-1200-1139 J7 CONNECTOR 810DING POST KED J8 CONNECTOR BINDING POST dLK J9 CCNNECTOR ~3INDING POST REO J10 CGNNECTOR BINDING PCST 8LK J11 JACK INPUT 14IN J12 JACK INPUT 14IN Jl~ SOCKET 8 PIN FOR PLUG IN XF~R
J14 SOCKET 8 PIN FOR PLUG IN XFMR J15 JACK INPUT 03F J16 JACK INPUT 03F
~ESrSTORS
07350-1
PART NO
JI
0199-0100 0553-0021 0553-0021 u129- 01 00 0129- 0 1 00
0650-1153
~
~yen
1886-2502
1990-5053 1990- 50 53 1990- 5053
0600-1500
A J
1350-001 1350-0011
1- 1200-2021 1- 1200-2021 1- 1200-2021 1- 1231-1042
1231-0008 1231-0009 1231-0008 1231-0009 9999-0111 9999-0111 1203-0008 1203-0008 9999-0130 9999-0130
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
-----4 - 10V
c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
~ I (El
LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
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~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
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ti~u
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07 tN4()()4
tN4004
t~1(
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N4004
ltgt lOuf 2~v
( tOuf 25V
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r- -shy -- I AI ~-- --61
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bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
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1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
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i U_ II I
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00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
SGW SYSTEMS INC
07350-2
ENG NO DESCRIPTION PART NO R1 22KDHM 12W POT 7006-1014 R2 22KOHM 12W POT 7006-1014 R3 4KCH~ lOW 10 4100-4003 P4 3000Hi 20W 10~ 4200-3002 R5 180KOHM 12W 5 500S-1304 R6 1 S K 0 H [-1 1 2 W 5 ~ S005-1503 R7 12KOHM 12W 5 SOOS-1202 RB 180KOHM 12W 5~ 500S-1804 R9 ISKOHM 121lt S~ S005-1503 RIO 12KOHM 121l 5 SOJS-1202
SWITCHES
Sl S2
SWITCH THER~AL SWITCH THfRIAL
0630-3441 U6 30- 34 41
S3 SWI TCH SLIDE STEREO-MONO 0620-6206 S4 SWITCH SLIDE METER CALIclRATION 0620-6206
TRANSFOIUERS
Tl TRANSFORMER POWER SUPPLY 0900-0751
ELECTRICAL HARDWARE ~
P2 CABLE PWR ASSY 8709-2163 3 CCNNECTOR MOLEX FEMALE PIN TYPE CRIMP 1231-1022 1 CONNECTOR M8LEX 4 CIRCUIT PLASTIC SHELL 1231-1042 10 LUG MOLEX FEM PIN TYPE CRIMP 1231-1102 3 LUG MOLEX FEM PIN CRIMP 1231-1105 10 LUG MOLEX 1231-1143 1 ORANGE JUMPER FOR T51 1231-17S5 1 TERMINAL STRIP 3 LUG 1231-3003 11 LUG CRIM P 1 2 - 10 H R E 1313-3457 2 LUG CRI~P TAP ED FOR 10-14 WIRE 1313- 412 3 6 LUG SLIP-O N 22-1 8 ~IRE 1322-9600 13 LUG SLIP-eN 16-14 hIRE 1322-9700 1 FUSE HOLDER 9999-4406 TEL BARRIER STRIP 7 LUG 0720-9127 T02 eARRIER STRIP 2 LUG 0720-3014 ~1 FAN ASSY 8802-34S0
~ - MECHANICAL HARDWARE _I -
2 KNee 83 DIA 0700-1213 2 CLAMP FOR PW R SUPPLY CAPACITORS 123S-0003 2 CLI p JAY 14 STUD FOR XH1R 123S-0313 4 CLIP FOR FAN 1235-0406 1 CLAMP STRAIN ~tLl EF 1235- 6034 1 PANEL eEARING 1261-0119 1 6 SPACER 8652-0015 1 PANEL ~RGNT 7S0B 7S08 ONLY 9000-17S1
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
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4 7~~A93 a2e PS 3
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1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
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1 SIGGND
I 10
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o N
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~ 121J1973aQ51O
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o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
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2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
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2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
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N4004
ltgt lOuf 2~v
( tOuf 25V
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bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
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I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
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rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
BGrI SYSTEMS INC
07350-3
ENG NO DESCRIPTION PART NO 1 CHASSIS 9002-0751 1 BRACKET FOR XFMR 9004-0751 1 BRACKET PWR SUPPLY 9004-0752 1 COVER 9005-1752 1 GUARD FOR PLUG-IN XFr~R S 9009-0251 1 PANEL SUB FOR VU METER 750B ONLY 901-0-0751 1 SEAL LEAD 9999-0014 33 TIE ~JRAP 9999-0550 1 NAMEPLATE SERIAL NO 9999-1000 4 FEET RUB8ER 9999-2085 1 GRILL [ ELEMENT FOR FAN 9999- 80 99 2 HANDLE BLACK 9999-9152
BRACKET XTRANS WPEM NUTS 750B 9004-1753 PLATE HOLE CLOSURE 750C 9006-1752
~ ~ jUTS 80LTS AND SCREWS -
5 6-32 X 78 PH MS PHIL BLK 2111-3875 10 8-32 X 12 PH MS PHIL BLK 2111-4500 2 8-32 X 34 PH MS PHIL eLK 2111-4750 4 14-20 X 12 PH MS PHIL BLK 2111-6500 1 6-32 X 38 PH MS PHIL CAe 2115- 33 75 6 8-32 X 38 PH MS PHIL CAD 2115-4375 2 6-32 X 58 RH ~1 S SLOT CAD 2225-3625 3 6-32 X 2 FH MS PHIL BLK 2311-3002 2 6-32 X 58 FH ~1 S PHIL CAD 2315-2625 3 6-32 x 56 FH MS PHIL CAD 2315-3375 1 8-32 X 716 FH I1S PHIL CAD 2315-4437 3 8-32 X 34 FH MS PHIL CAD 2315-4750 6 10-32 X 12 FH MS PHIL CAD 2315-5500 2 6-32 X 3d FH 1S HEX SC BLK 2331-3375 2 8-32 X 58 FIL H MS SLOT CAD 2425-4750 4 10-32 X 34 HeX FH CS BLK 2451-5750 3 6 X 38 PH S-1 S PHIL BLK 3111-3312 4 ~ 8 x 12 PH SI1 S PHIL CAD 3115- 4500 3 t~ 6 ITL wASHER 8132-0000 2 6 ELT rfASHER 8133- 0000 1 8 ITL WASHER 8142-0000 7 8 ETL flASHER 8143-0000 4 10 FLAT ~ASHtR 8151-0000 6 no ITL WASHEK 8152-0000 20 10 SPLIT WASHER 8154-0000 4 10 EXT-INT TOOTH LOCKwASHER 8158-0000 2 14 S PLI T WASHER 8164-0000 2 6-32 X 14 HEX NUT 8530-0250 2 6-32 X 516 HEX NUT 8530-0312 8 8-32 X 516 HEX NUT 8540-0312 2 10-32 X 38 HEX NUT 8550-0375 2 14-20 X 716 HEX NUT a560-0437 2 38-32 HEX NUT NICKEL 8574-0500
V PACKING MATERIALS 1middot bull
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
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-
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4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
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1 SIGGND
I 10
I CLIP
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o N
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o MFRM - 07211 IIDI ON f
I
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SCH~~ATIC MFR~-07~11
- PAC I FJ R
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~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
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bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
BGW SYSTEMS INC
07350-4
ENG NO DESCRIPTION PART NO 1 MANUAL
1 1
CARTON CARTON
INNER OUTER
9700-1752 9851-1750
2 RAIL BLOCK 9852-1750
8 CORNER BLOCK 9854-0150
1 BAG FOR CORO 9899-0004
1 BAG FuR AIPLI FIE q 9899-2030
bullbull
bullbull
ISObull
~ 91(
+ 10f
lce ~C ~ I N4r OA
4 middot11(
IOuFk RI IOOJ lV HO 41 -Ip bull
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c
Rl R ~IIC ~~9J( ~~~J( 2
+L( (II
T~o 1 12
-
-LCR1 6IH4140A ~
4 7~~A93 a2e PS 3
1001(
1 - DC vOL fi SHOWN t 1a VOL TS fYP
6 -~ A( fOL TS FRON GROUND USING A(VT -UH $1rNAL
50- r=J DC vOLTS fRO GROUND USING fT-HO $IGNAL APPUID
4- RpoundF MOO(lS 60 0 1S0B ANO( 1001(
RI
R o - (Mpound(k PARTS lI~ fOA fAlUH OF UN AIIC(O CO WPOHlNTS
2 R Z 2 TO B( ~H(( HD fOR )10 VOL T5 AcRo$~ (1oI1f1 (~R(SISfOR fOR QIOOR 011
R24 5EL (0(0 fOA IfliW Ol T5 T PI b Of Ie I AT ROO T( P[lhTUA(
_ All Af~I~TO$ t5lnw EXCEPT AS SHOWN
NOTES uSSOT~_ ---shy
r-+_t-l-_~+__-lt81 lal~ IN
1 SIGGND
I 10
I CLIP
~ IGNO
IVshy
0 I I
~ I (El
LC OUTPuf JI-_ 41~kU
IIL __ OUTPUT
Cll 3D ~~
0 ~ I
o N
I ~~ IIttrIIP ~ ~WSlSTfMS lJllOSOUl YUKON 411f ~ IIG~ HAWHOANEC4~
~ 121J1973aQ51O
J~u- ou-2P -w1 r- 1- 1iD TU
~ SCHEMATIC HEAT SINK MODULE = ltgt POWER AMPLIFIER ata~~ fORM
o MFRM - 07211 IIDI ON f
I
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
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C j4UF ~lt-j l J [ iC CC~A ~ l C OIL ) - 0 ) 4 7
c) 3jPF IOUV gt10 t) I[Cl (01) J - OJ]O
C I (J 0 gt10 500V L) [-pcu 11 C A O]nO -O I JO
CJ 4(r= I K J u IC CcRAIC o t 0 l -OU 47 cJ bull J OJ )F I v DISC C~JII L OIOO-OJCl5
cia 120~F Suov OIPP2~ MICA U)iO-Ol0
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C17 2~OlJoF 500v D ISC C~~A~IC )0 middot 0 - 2-gt00 C I 3 IUF 100V O I P)iC) middotIYL K U 3~ )- 0 1 00
C 1 i IUI ~51 GISC c ylt ~I[C O J ) q-IJIOJ
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IU r=
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lKV J [ SC ~RA ~ I C J [ J J - 1 ) l (
C ( 1 l ( 7 4 I ) J L T L ~ r r~ 1 ) ) ) - 14 J
C~ 2 4 74J A [ oj vJLT Lgttr lJ uQ - 4 14 )
CJ [ 4 I ~ 1 J [ Sd r C 1 loj C ) ) LI
C~4 l bull 4 1 4i _) I S [ T C 1 I G ) I J- co ~ J J 0 - 1 ( G
Clt) [ 1400 ) )() -4lJ ()
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I T t lt0 T ) c r C) [T
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J c J t J 1gt 1 r r ~ j I J T gt 1
~ G -I S Y S I L S bull bull c bull 07220-2
~ lG W f) 5~fl igt TI P A~ I 4)
OJ J E 7 2 IJ I P ~ T ~ 0 i I j r R 1 5 4-0120
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middot 3 ~) J ri1 ~ 0 1 J ~ rl C ~ ) - 3 i 0 ~~
~ 4 7 JH 1211 5 ~ S ) u -41J2 ~ I v 0 l rl A 1 ~ gt J () fJ 5 - 1 0 ) 2shy
~ J l K 1 h l 1 ~ ~ ~~ fJ 5 -4l0J
r 1 bull 60 J-I J 12 fi -~ J bull -gt O J s -r) j i) 1
rlt L 1 lt -1- i i 1gt ~j ~ r) f] S shy 1 j 1 J
lt I 1 I c bull
1 ) lt
rJJO
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) IJ J 5 shy
SO ( shy
1 ~ J - J - C L
I 7 f) J
P S ~ 7
1 )0
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1 gt
J bull
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lt -= -1 1~ J
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lt -- shy I ~ A r r -
q~j 1 ~j ~ J ~ bullbull 1 2 1 - 0 j =-shy 1) ()4
r~t 7gtlt ] r~ 1 ~~ ( ) ~ ) f) J ~ - 7 J J
gtJ V S Y S T = S bull I 1 C bull 07220-3
E jG ~jJ D i~ Sc R r l T I ~l~ I-AH T L)
i G 7 1 J Ilt Cl ~ 1 1 2 ~ ) ~ 500S -I J0 4 ~) ~~ 1 JK 0-11 1 2 J) 50 G) -lu04J
~ ~ l 1 O~ J H 1 2 S SO ()5 -I U05 fUO 4 7 lt J ~t 1 ~ ~ S 0 00) -1 005
j 1 2 7 J r-tv 1 v 5 () J S - 7 J 2 ~J 2 2 7 lt-- J1 1 c gt00) -27) 2 r~ J J 4 bull 7 lt J 1 r 1 L I 50J 5 -4 7 O~ ( - 4 1 ) 0 0 ~ 1 211 50 5 -l u~2
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f-U 1 bull J 3 (JH 5 y 1 0 40 5J - J J J 0 lt J ) bull ~ J 0 - 5 1 () ~ (~() 5) -O _)JO I J 1 01 1
5 1t1 ~ 4) 5 C - ) J ) (jbull J
~l I middot J 3 Qt-i ~-I ) 1 n ~ 4()0-0330 1 ~l 2 47JIlt -1 middot112 bull SOJl -47i 2
~~ (4- 3 bull jJ 0 I 5 1 O ~
r~ 4 middot ~3 Jri middot1 SI 1 J - 4j)O - JI30 -~ -+ -~
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P- 2 7 01 ~ 2 S 4() ~c - 2J 70
4)t) Jj ) rl J 1 u x 4 j ) Cl- j ) () 1
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(Jf-3~J-J4 42
J ~gt~ r) - J bull 4 t
1 L 7j1-l21
r S JLAT JQ )1-4JJL ) i_ I ~ 0 7 2 - 3j41
1=- r S I lt r ~ J 1J ~l I f)j( - ~ - l
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k ~O I -- -33Z ) t B 7 C bull 000
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=
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I
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l~1-t
j I)Luli j I R~lt
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tjlAlt 0 - 05eoP ~
YihD ~ o~ 1j CT F
--0H~Z OA i---- --=- CLIP - O ) 2 0
l --01- 501
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004[1gt02RIGHT RS(pA~O I~I~ 41 4J( n IK
DOlaquoshylt IH~1 e
C~2 D VA I47 ~ O~
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RI1 6 D3I~ o~- 21 ~
lt igt R~obull K 14 132 I 10 ~ e e
1( 5 02 RgtJ2shy00 LM3915
(p R h
0-lt
2 - v 1 5 (1 3 o~ 70shyL 1324shy)
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CLI P D ~2~
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1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
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Pi
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bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
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SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
bullbull
bullbull
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SCH~~ATIC MFR~-07~11
- PAC I FJ R
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f-U 1 bull J 3 (JH 5 y 1 0 40 5J - J J J 0 lt J ) bull ~ J 0 - 5 1 () ~ (~() 5) -O _)JO I J 1 01 1
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~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
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Pi
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bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
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SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
07220-1 h j SYS T IS Io e
CgttS(RI~T IY PAltT ~ -J
P ~T3 LIST FI] - 07L 20 ~ -
[)-ltIT E ) CICdIT i-3UA -~D~SY 9007-0151
SCH~~ATIC MFR~-07~11
- PAC I FJ R
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NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
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330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
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Pr GO
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bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
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P72 NO
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rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
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~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
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ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
gtJ V S Y S T = S bull I 1 C bull 07220-3
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l~1-t
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tjlAlt 0 - 05eoP ~
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004[1gt02RIGHT RS(pA~O I~I~ 41 4J( n IK
DOlaquoshylt IH~1 e
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gt0-0 ~ ~vc gt0)1 Ie 50 3 0 tshy0511- 2 7
RI1 6 D3I~ o~- 21 ~
lt igt R~obull K 14 132 I 10 ~ e e
1( 5 02 RgtJ2shy00 LM3915
(p R h
0-lt
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+v 0
CLI P D ~2~
IIIIt[J$ ~r-sl SKCV8I 8GwSVSTEMS 13130 SC1I1HYUj(ON AVE
1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
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03 0 4
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ti~u
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tN4004
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bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
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bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
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rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
MOOS -
---~~ ~ Iftl
~~ I I IDLE Fi R51S
C W I I 508 -0
o gtCo1-i~
1
Imiddot1gtt1 ~~ bull r 0 I I 1~1j8
k ~O I -- -33Z ) t B 7 C bull 000
J-Ficooi Ie j03 r-~e -4 T
o~o
0312- 2 7 shyLEFT C )0(0 Rl17If ~ c -V
=
vvvv
Oll~~t-l -2 1 - ~~00O l 0 1~W -15 y 2VRgtIIJR
~ 10I ~ 3 J -gt 1lt 1(501 W 0 ~W DI8-12 ~ ~ LM3J15 I- Q5Z 3
pound0 +15V
50
I
--F R ZtII ~fGRIEN _ 0 j Z2 lO rlt
l~1-t
j I)Luli j I R~lt
-) -J 024
tjlAlt 0 - 05eoP ~
YihD ~ o~ 1j CT F
--0H~Z OA i---- --=- CLIP - O ) 2 0
l --01- 501
R)04 n
TOOK
004[1gt02RIGHT RS(pA~O I~I~ 41 4J( n IK
DOlaquoshylt IH~1 e
C~2 D VA I47 ~ O~
gt0-0 ~ ~vc gt0)1 Ie 50 3 0 tshy0511- 2 7
RI1 6 D3I~ o~- 21 ~
lt igt R~obull K 14 132 I 10 ~ e e
1( 5 02 RgtJ2shy00 LM3915
(p R h
0-lt
2 - v 1 5 (1 3 o~ 70shyL 1324shy)
+v 0
CLI P D ~2~
IIIIt[J$ ~r-sl SKCV8I 8GwSVSTEMS 13130 SC1I1HYUj(ON AVE
1I~cNCllCJ~ USooSI I~ ~ tm~ampCAQCtl5(
2 3 4 5 G 7
=~~ nSCHEIVIATICVU METER J Pl BOARD ~0 07-04 1 3 B ~ 22 5EGIVIEN TC RS27 3 11 2~ 2 50 E 5 11 2~ 7505
~-= MFRrvr-D7i04 REVJ REFER TO PAR T LIST M FR M- 0750 1
NOTES UIIlES~ OlI1lAWtSESPEOfIpoundO WI
=10-=- ---
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
BIG NO
CSOI C502 CS03 CS04 CS05 C506 CS07 CS08
0501shy0506
0501 050dshy
OS11 051dshy
052S 0525shy
0529
IC 01 IC502 ICSO)
P501
Q501 0502 Q503 0504
R501 P502 PS03 R504
DESCR I PT ION ARTS LIST VU METE~ LED
SCHEMATIC VU ~ETER LED BOARD
C APlt CIT 0 R S
47UF 10011 ~ltETAL MYLAR CAPACITOR
47UF 1001 METAL MYLAR CAPACITOR lUF 2511 TAillTALU1 CAPACITOR lUF 2SV TANTALW1 CAPACITOR bull 1 Ur= 2SI CERAHC DISC CAPACITCR 1 UF 2SI CERAMIC DISC CAPACITOR 1 UF 25 CERAMIC DISC CAPACITOR 1 UF 251 CERAMIC OISC CAPACITOR
DIODES
IN41481N914 DIODE
IN4140A 1011 ZENER LED GREEN
LED YELLOw
LED RED
INTEGRATED CIRCUITS
L~391S LED VU ~ETER DRIvER L~3~15 LEO VU ~ETER DRIVER L~324 OUADOP AMP
PLUG
MOLEX CONN~CTOR OJ-09-2052
TRANSISTORS
P~4250 SI-ICOJ TRANSISTOR PI4P PN4250 5 IL I CON TRANSISTOR PNP PN2484 SILICON TRANSISTOR NPN P12~84 SILICON TRANSISTOR JPN
RESISTORS
20K 12 CARBON CDMP RESIgtrOR 20K 12W CARBON COP ~ESISTLJR
1 u OK 12 M CARBO CO MP RESISTOR 1001lt 12w CARBON CO~P RESISTOR
80ARD
MFRM-07104
07501-1
PART NO 07501
0363-8000 0363-3000 0226-0001 0226-0001 0129-0100 0129-0100 0129-0100 0129-0100
1900-4148
1900-4740 1990-4950
1990-4550
1990- 4650
18i15-391S 1885-3915 1885-0324
1231-2052
1 8S3- 42S0 19S3-42S0 1854-2484 1854-2484
5005-2004 SOOS-2004 S005-1005 S005-1005
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
07501-2BGw SYSTEilt1S INC
ENG NLJ DESC~IPTrUN PAflT NO
R50S lK 1~~ CARBON COMP RESISTOR 5005-1003 R506 IK IZW CARSON CO~P RESISTOR 5005-1003 R507 3JOR 12w CARBON COMP RESISTOR 5005-3301 RS08 330R IZW CARBON CO~P RESISTOR 5005-3301 R509 62K 12M CARdON COI-tP RESISTOR 5005-6202 R510 62K 12w CARSON ca~p RESISTOR 5005-6202 RSll 750~ l~w CARBON caMP RESISTOR 5005-7501 RSl~ 750R 12W CARBON caMP RESISTOR 5005-7501 RS13 820R 12W CARBON ca~p R~SISTOR 5005-~201
R51 39K 12~ CAR80N COMP RESISTOR S1)05-3903 R51~ S60R 12W CARBON caMP RESISTOR 500S-5601 RS16 SaOR 12W CAR90N CO~P ReSISTOR S005-S601 RSI7shy IJK 12w CARBON COMP RESISTOR 500S-1004
R522 fb23 330R 12w CARbON caMP RESISTOfl 5005-3301 R52 3JOR 12w CARBON ca~p RESISTOR 5005-3301 R525 IJK 12laquo CARBUN COMP RESISTOR 5005-1004 RS26 10K 12~ CARBON COMP RESISTOR 5005-1004 ~52 7 MUDEL 2S0E39K 2~ WIRE WOUND RESISTOR 6020-3902
~ODEL 7S0d51K 2W wIRE ~OUND RESISTOR b025-5102
~ IS CELLANEOUS
MOLEX PINS 02-09-21H ll49-2137 Ali G 22 SOL 10 TINNeD BUSS 8022-0S00 AI4G 22 19 STR PvC BLACK 8222-1100 A middot~G 22 19 STR pvc RED 8222-1120 AvG 22 19 STR PvC GREEN 8222-1150 AIIG 22 19 STR PVC BLUE 8222-1160 AJtG 22 19 STR PvC WHITE 8222-1190 ROU4D SPACEK 14 DIA 38 LONG 8606-0375 PC UOARD 22-LAMP vu Igt1ETER 9007-0 1 J
r-------------------------------------- I I I I I I I I I
~ IN4Q0 4
03 0 4
(I HOu 16V
bull ( 2
ti~u
6J~I 2N540
+ o
01 SOOn
2 Oi 5 11( ~N4004 2
07 tN4()()4
tN4004
t~1(
)0 tN4745 ~ 0 9
N4004
ltgt lOuf 2~v
( tOuf 25V
~Ibullbull
r- -shy -- I AI ~-- --61
~ I ~ ~~~OO4
L __ ~ _u_1 bullbull
bull Q2(5 RS -It1 )O u 100
5 0 tOOn IN5 ~ I
~~
Oil ~Ol ~Q 01 0 Ut4004 tM4()()4 tH4Q04 lOOK liPS-55
I ~cI tau l~Y
1i11 A-9 (7
330 J10IC tof 25V I I I I I
L _ _ ______________________________ -JQQ251 ~pound~
bull z - WHU RE P LACING A$S [ UlI lS NU MttHI[) ~O Il -OZ SIJ OR [ ARL IER HnmV[ U4
PO
Pi
P pn P60
P6~ 66P64 P61 i C J IdegtJO
P12 -f P11 J L-plO
PIN LOCATIONS
Pr GO
60 )gt--------shy
bullbullbull TO OUTPUT JACKS
- ---- +1~VDC VU METlA PCB
P69 RIGH CHANNEl
Pil TO OUT P UT JACKS P63 LEfT CHANNEL
6 fAO H(AT SINK OuTPUT PI RIGHT CHANNEl
fROw HfAl SINK QUTPUfPOltP6gt LEfT (HANN(L
11 ) ~ P OWER ON
P7] Ie NOZ
P70 -vee
P6i Ae NO 1
P72 NO
~lUG~IIIDtO ~ _ lOUlWlCla
IfU ~_NJCI
yvTU ~
1lILIIoMCI~~
~- middot~~~t Jd MpoundM IDIIO -amp u shy
JG~e
II~
i U_ II I
o co o Jgt
00 ~SY~~UlCONIf
rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
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Pil TO OUT P UT JACKS P63 LEfT CHANNEL
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rt1~~
SCHEMATIC RELAY BOARD POWER AMPLIfiER
D I MFRM- 0 8304
1 - All R[SI5TORS ~- IIZ W EX CEP T AS SHOWN
NOTES UNLf SSOTHEAWJOE 6PEOflfO 1IICII1CoId-- loCO
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
BGo SYS TE~1S 1 NC 08340-middot1
E~G NO DESCRIPTION PART N)
PARTS LIST RELAY PCg 9017-0251K SCHEMATIC RELAY aOARD MFRM-08304
~r CAPAC I TORS
Cl 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C2 330 UF 16 V RADIAL ELECTROLYTIC 0466-0330 C3 10 UF 25 V TA~TALUM 0226-0010 C4 10 UF 25 V TANTALUM 0226-0010 CS 330 UF 10 V RADIAL ELECTRULYTIC 0446-0330 Cb 10 UF 25 V TANTAL~M 0226-0010 C7 lJ UF 25 V TANTALU~ 0226-0010
DIODES ANO lENERS
Dl lN4()04 lA 400V 1900-4004 D~ lN4004 lA 400V 1900-4004 D3 114004 lA 400V 1900-4004 D4 lNJ004 lA 400V 1900-4004 D5 lN4745 16 VULT ZENER 1900-4745 D6 lN4004 lA 400V 1900-4004 D7 lN4004 lA 400V 1900-4004 Dd 1 gtj 40 04 lA 400V 1900-4004 Dltj lN4004 lA 400 1900-4004 DID lN4f)04 lA 4()OV 1900-~004
D 1 1 1~4U04 A 400V 1900-4004 D12 114004 1 A 400V 1900-4004 gt13 lN4745 16 VOLT ZENER 1900-4745 014 1 ~4()04 lA 4(JOV 1900-4004 D15 lN4004 lA 400V 1900-4004
K 1 ~~LAY ~ITrl MA~NETICS 12V DPOT 0800- 1 () 01
TRANSISTURS
01 P~P 51 PLASTIC T092 2N5401 1853-5401 ~~ NPN 51 DARLINGTON PLASITIC T092 MPSA13 1854-0013 Q3 NPN 51 PLASTIC TO~2 MP S 3394 1154-3394
= ~ESIiTORS
5~0 54 2~ DEPU5IT~D CAR30N 5005-5 (01 51lt 10~ 2~ CA~~ON COMP 6025-5102 100~ 5 12~ OEP05ITED CAR9 0~ 5005-1005 47K 5~ 1211 DEPOSITED CARclO~ 5005-4703 100 5 12~ DEPDSITEO CAR BON 5005-1gt02
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
BG~ SYSTEMS INC 08340-2
ENG Rt) Fl7
NU DCSCRIPTION 47K 5 12ltf middot )EPOSITED CARBON 33K 5 ~ 12 DEPOiITED CARBON
PART It)
5005-4703 5005-3303
Q~ lOOK 5 12 DEPOSITED CARBON 5005-1005 RCJ 3JK 5 12 DEPOSITED CARBON 5005-3303 RIO 1001lt 5~ 12w DEPOSITED CARBON 5005-1005 R 1 1 Itlt 5yen 12w OEPOSITED CARBUN 5005-1003
~ISC PARTS RELAY BOARD
RCLAY 3UARD COMPLETE ~ITH PARTS 9017-1251 P~INTED CIRCUIT BQARD 9017-0251K 9017-0251 ~ELA Y SOCK E T 1204-1000
1 RELAY HOLD DONN wIRE 9999-9002 2 6-32X)d PH PA~ ~S 2315-3375 2 flo ITLv 8132-0000 2 6-32X14 HEX NUTS 8530-0250 4 6-3~X14 STANDOFFS 0772-1437 14 MULEX PINS ON PCB 1349-9312
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
04601
POWER CABLE CONNECTIONS AND VOLTAGE CONVERSION
CAUTION These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than tha t contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel
Vol tage Conversion should be done by a BG W Author ized service station only
The unit should be plugged in only when it has been established that it is wired for the correct power mains voltage and after all other connections have been made
A molded parallel blade U-ground plug is supplied This connector is standard in the United States and Canada For use elsewhere the plug must be replaced with the correct connector The color-code of the cord is as follows
HI (switched Leg) - Brown (or Black) LO (Neutral Leg) - Blue (or White) EARTH (Chassis ground) - Green with Yellow tracer (or Green)
The mains (AC line) voltage is indicated on the serial number label on the rear of the unit Products for use in the United States and Canada are factory wired for 120 volts Only the indicated mains voltage should be used If the mains voltage must be changed see information below
VOLTAGE CONVERSION
To change the mains voltage the transformer wires on terminal strip TBl must be rearranged TB 1 is mounted inside the chassis on the rear wall To gain access remove the cover and the heat sink module on the same side as the power cord The cable to the heat sink can be unplugged by exerting a constant pull on the plug while wiggling it
Remove the other heat sink module when changing the circuit breaker The chassis wiring schematic indicates the proper terminal strip connections and circuit breaker requirements for each voltage
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto
17010
THREE YEAR LIMITED WARRANTY
BGW SYSTEMS INC (BGW) 13130 South Yukon Avenue Hawthorne California 90250 warrants to the original owner all parts except front panels knobs cases and cabinets of every new BG W product to be free from defects in materials or workmanship as hereinafter provided for three (3) years from the original date of purchase
BGW will at its option repair or replace any equipment covered by this warranty which becomes defective malfunctions or otherwise fails to conform with this warranty under normal use and service during the term of this warranty at no charge for parts or labor
In order to obtain warranty service the equipment together with the original or a machine reproduction of the Bill of Sale or other dates proof-of-purchase document describing the equipment must be delivered to an Authorized BG W Service Center in the continental United States or to BG W at the above address at the owners expense Any evidence of alteration erasing or forgery of proof-ofshypurchase documents will be cause to void the warranty Collect shipments to BGW will be refused unless previously authorized The names and addresses of Authorized BG W Service Stations are listed in your owners manual or may be obtained by writing to BGW Warranty Department at the above address
This warranty does not cover defects malfunctions or failures resulting from shipping or transit accidents abuse misuse operation contrary to furnished instructions operation on incorrect power supplies operation with faulty associated equipment modification alteration improper servicing tampering or normal wear and tear Equipment on which the serial number has been defaced or removed shall not be eligible for warranty service Should any equipment submi tted for warranty service be found ineligible therefore an estimate of repair cost will be furnished and the repair will be accomplished if requested by the owner upon receipt of payment or acceptable arrangements for payment
ANY IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE PERIOD OF TIME SET FORTH ABOVE BGW SHALL NOT BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSION MAY NOT APPLY TO YOU This warranty gives you specific legal rights and you may also have other rights which vary from state to state This is the only expressed warranty applicable to BG W products BG W neither assumes nor authorizes anyone to assume for it any other expressed warranty
Completion and return of the owner registration card enclosed with the equipment is requested but is not a condition for obtaining warranty service
BGW reserves the right to make changes or improvements in design or manufacturing without incurring any obligation to change or improve products manufactured prior thereto