av receiver with digital amplifier technology str-da5000es, str-da3000es, str-da2000es diagnostics...
TRANSCRIPT
Training Manual
Course: A-126
A/V Receiver withDigital Amplifier TechnologyModels: STR-DA5000ES
STR-DA3000ESSTR-DA2000ES
Diagnostics and Troubleshooting
STR-DA5000ES
Table of Contents
A-126 Introduction .................................................. 1Digital Amplifier Technology ..........................................................1
1. Overall Block Diagram....................................... 22. Power Supply (Switching Regulator).............. 5Overview ..........................................................................................5Switching Regulator ........................................................................5
Troubleshooting Procedures .........................................................7Testing Switching Regulator Unloaded.........................................9Testing REG Board........................................................................12
3. Analog & Digital Audio System........................ 14Overview .........................................................................................14Overall Audio Block Diagram .......................................................16Troubleshooting Tips Per Board ..................................................18Entering Diagnostics Mode ..........................................................16
4. Video Processing System ............................... 32Overview .........................................................................................32
Overall Video Block .......................................................................32Video Section Troubleshooting ....................................................33Troubleshooting ..............................................................................22Internal Pattern Generator .............................................................27
5. Protection Circuits ............................................. 41Overview .........................................................................................41Excessive Output Amplifier Current (Error 11) ............................41Regulator and Output Amplifier Temperature Protection Circuits(Error 12 and Error 13) ..................................................................42
Output Amplifier DC Detection Circuit (Error 21) .......................43Output Amplifier B+ Detection Circuit (Error 22) ........................44
6. System Control .................................................. 46Overall Block ..................................................................................46
Troubleshooting ..............................................................................47
Appendix A ................................................................ i
1
A-126 - Introduction
A-126 - Introduction
This manual covers troubleshooting procedures for the new ES series AVreceivers. The STR-5000ES, 3000ES and 2000ES are the first Sony AVreceivers to take advantage of the Digital Amplifier technology. Thetroubleshooting methodology used in this manual is in the sequence ofsymptom acknowledgment to board level diagnosis to componentlevel repair. Keeping this sequence in mind as you read through thetraining will result in effective and efficient troubleshooting.
Digital Amplifier TechnologyThe STR-5000ES, 3000ES and 2000ES series AV receivers incorporatestate of the art Digital Amplifier technology on all output channels. AlthoughDigital Amplifiers have been around for decades, it is only recently that thetechnology was possible in consumer home audio component designs.What made it possible are the advancements in Digital Signal Processor(DSP), Large Scale Integration (LSI) and fast Switching Output Transistortechnologies.
Benefits of Digital Amplifier Technology:
• Elimination of any Crossover Distortions through the use ofPWM signals and Low-pass filtering processes.
• Substantial Heat Reduction due to the fact that the outputtransistors are only used for switching; they do not perform anyoutput signal shaping processes (analog output transistors performsignal shaping). All signal shaping is performed by the low-passfilter. This also reduces thermal distortion caused by the heatingand cooling sequences of the output transistors as they are drivenby the audio signal.
The substantial heat reduction also enables a Simpler ChassisDesign. The output transistor heat sinkers are greatly reduced;there is no need for cooling fans; the isolation of the outputtransistors to the rear or side of the chassis is no longer necessary.
Because of the increase in digital media and communications, theconsumer electronics market is moving quickly towards minimization andsleeker audio equipment. These trends indicate that the market is readyfor completely digital audio systems, an audio system that can take adigital input signal all the way to the speaker without ever converting it toanalog. An example of this is Sony’s ES series AV receivers, which arecovered in this manual.
2
1. Overall Block Diagram
Chapter 1 - Overall Block Diagram
The following overall block diagram provides a high-level and simplifiedview of the complete system found in the STR-DA5000ES, 3000ES and2000ES AV Receivers. The diagram is based on the STR-DA5000ESbut can also be applied to the 3000ES and 2000ES with small layoutdifferences. For example, the 3000ES has no 3rd Zone and the 2000EShas no Zones and no Pre-Out.
The block diagram provides the technician with the simplified layout ofthe major audio, video and control signal paths, as well as how they are
routed through the various boards in the system. Whentroubleshooting, use the overall block to diagnose a problem to aparticular area or board, and then use the more detailed diagrams inthis training manual to drill down further in that area or on that board tofind the defective component.
Following Fig.1-1 is a brief description of the function of the PCBs in theoverall block.
3
1. Overall Block Diagram
FIGURE 1-1 - STR-DA500ES OVERALL BLOCK A126.1-1 6/15/04
2CH & MULTI-CHANALOGAUDIOINPUTS
VIDEO S-VIDEOBOARD
AUDIOBOARD
S-VIDEOINPUT
AUDIO
MULTI-CHANALOG
2CH L/R
SURROUND
ANALOG
ANALOGSUB
BOARD
FEED THRU
ANALOG OUTPUTS2ND & 3RD ZONES
DIGITAL
SURROUND
2CH
A/D
TUNER AUDIO
VIDEO
VIDEOINPUTS
VIDEOOUTPUTS
VIDEOBOARD
(RS232) CONTROL
VIDEO 3BOARD
DIGITAL (OPTICAL)AUDIO INPUTS
CISBOARD
TUNER
CO
NTR
OL
FLBOARD
DIGITALBOARD(MAIN &
SUBMICRO #1)
FL D
RIV
E
CO
NTR
OL
THERMISTORBOARD
REGBOARD
SWITCHINGREGULATOR
BOARD
CONTROL DC SUPPLIES
D-AMP(SUB MICRO
#2)2 CH
MULTIAUDIO
MULTIAUDIO
POWER SWBOARD
CO
NT
RO
L
POWER SWSUB BRD.
PRE-OUTBOARD
ANALOGANALOG
SURROUNDOUT
HP BRDHeadphone
SPEAKEROUTPUTS
FUNCTION JOG VOL KEY
FEED THRUFOR PRE-OUT
AUDIO
AUDIO
AUDIO
CONTROL
CONTROL
AUDIO
4
1. Overall Block DiagramSWITCHING REGULATOR BOARD: The Switching Regulator boardprovides the Main and Standby switch-mode power supply circuits. Thevoltages produce by the switching regulator include 33V to 68V for outputstages, +/-12V, -9V. Also located on this board are the AC Relay RY001and the regulator ICs for V+12V and V-9V (as labeled on the schematic).NOTE: This board is replaced as one complete assembly.
AUDIO BOARD: 2 Channel and Multi-Channel input selection are the mainfunctions performed on the Audio board. The processing and output forthe 2nd Zone is also located on this board, along with the 2 Channel analogoutput jacks (including MD/DAT, TAPE, V1 and V2).
ANALOG SUB BOARD: This board contains eight amplifiers for all themulti-channel analog signals before they are applied to the Digital boardto be A/D converted. NOTE: The 2 Channel signals do pass through thisboard, but no processing is performed.
DIGITAL BOARD: The two DSPs located on the digital board perform allprocessing for the various sound fields. The Main and one of the Sub(IC2701) Microprocessors are also located on the digital board. All opticaldigital input jacks are mounted directly to the digital board.
D-AMP BOARD: The D-Amp board is the digital amplifier. On this boardare the PCM/PWM processor ICs, which convert the PCM signal into aPWM signal. The PWM signal drives a digital amplifier IC, booster/switching transistors and associated low-pass filter (all located on the D-Amp board). The resulting analog audio signal then leaves the D-Ampboard to drive the speakers. Also located on this board is the other SubMicroprocessor (IC1800). The Sub Microprocessor performs the directcontrol of all the PCM/PWM processors, the supply voltage to the poweramplifier output stages for volume control, and also the monitoring of theOver-Current and Voltage protection circuits.REG BOARD: As the name implies, on this board are mounted the +/- 5V,+/-10V, +3.3V and +9V regulators. Also located on this board are some ofthe switching circuits for the volume control and the D/A converter, whichfeeds the Pre-Out board.
PRE-OUT BOARD: The Pre-Out board performs the tone/electrical volumeand line amplification for all the Pre-Outs, including the Sub-Woofer output.
VIDEO BOARD: The Video board provides all composite video inputswitching. All composite video input and output jacks are mounted directly
to the video board. This board also performs all video signal processing,producing Y/C signal from a Composite signal and Y/B-Y/R-Y componentsignal from a Y/C signal.
OSD/Video output switching is performed on the Video board. Theswitching relays (RY3304, 3303, 3305, 3306) for selecting ComponentDVD or TV IN, and the switching relays (RY3301, 3302) for selectinginternally produce or external component signals for component outputare all located on the Video board.S-VIDEO BOARD: This board includes the switching ICs for all the S-Video inputs. The S-Video inputs jacks are mounted directly to this board.
VIDEO 3 BOARD: Mounted to this board are the S-Video, Digital Optical,Composite and L/R analog audio front input jacks.
CIS BOARD: The CIS board provides the interface for the Control-S,Trigger Out and IR Remote connections on the rear of the unit. The frontIR sensor also comes into this board; a selector IC switches between frontand rear remote IR sensors.
FL BOARD: This is the display board with fluorescent tube and drivecircuitry. The front IR Sensor is also located on this board.
NOTE: All front panel board control signals feed through the FL board.
FUNCTION BOARD: The rotary Input Selector control is mounted on thisboard.
JOG BOARD: The Bass, Treble, Main Menu, Menu and +/- controls aremounted on this board.
VOL. BOARD: The Master Volume control is mounted on this board.
KEY BOARD: The Music, Movie, A.F.D and 2CH buttons are mounted onthis board.
POWER SW BOARD: The IR Transmitter LEDs and drive transistors arelocated on this board. NOTE: The Power Switch signal does pass throughthis board.
POWER SW SUB BOARD: The Main Power Switch is mounted on thisboard.
THERMISTOR BOARD: This is the small PCB and temperature sensormounted to the regulator’s heat sink on the REG board.TUNER: AM/FM demodulator.
5
2. Power Supply (Switching Regulator)
Chapter 2 - Power Supply (Switching Regulator)
OverviewThis chapter covers the power supply section of the AV receiver, whichconsists of the Switching Regulator and the Regulator board (or REGboard). As the names imply, the Switching Regulator provides all theswitch-mode power supply circuitry and the AC Relay. The REG boardcontains all voltage regulators except for three (+12V, -12V and –9V),which are located on the Switching Regulator board.
Switching RegulatorNOTE: The Power Supply or Switching Regulator board is not componentlevel repairable. The board is replaced as complete assembly.
This section provides a troubleshooting procedure with the following goalsin mind.
To determine if:
1) The Switching Regulator itself has failed.
2) The Switching Regulator is being turned ON.
3) There is an excessive load on the Switching Regulator when inservice.
6
2. Power Supply (Switching Regulator)
FIGURE 2-1 - POWER SUPPLY OVERALL BLOCK A126.2-1 6/17/04
REG BOARD
NOTE:THIS DIAGRAM ISDIRECTLY FROM THE SM.
V+B
TEMP (P)
V+5V
VOL-DC
VOL-DC AMPIC903
5 7 3 1
DISCHARGEQ909
Q908+
+BSWITCH
Q904
BUFFERQ905, 906
2
3 +
-1
ERROR AMPOC103
DRIVERQ101, 102
+6V REGULATORD203, Q202
VOL-SWVOL-SW
V+12V
V-9W
A+5V+5V
REGULATORIC691
+5VREGULATOR
IC910
+3.3VREGULATOR
IC909
+9VREGULATOR
IC905
+5VREGULATOR
IC904
+B SWITCHQ913
+5V DSP
+3.3V DSP
+5V
+9V 4 3
5
2
4 3
Q911
+B/-B SWITCHIC1913
V POWER
-5VV-5V
REGULATORIC906
-12V
+12V
+3.3VB
+5VB
+3.3VREGULATOR
IC911
+5VREGULATOR
IC912
+10V+10V
REGULATORIC4001
-10VREGULATOR
IC4002-10V
+12VREGULATOR
IC200
D201RECT
-9VREGULATOR
IC202
D202RECT
D210RECT
Q201
JL903
D301RECT
D302, 303RECT
SWITCHINGQ004
T002POWER TRANSFORMER
D013RECT
ISOLATORPC002
-12VREGULATOR
IC201
D405
POW RY
POW CHG
STOP
D401RECT
SHUNTREGULATOR
IC401
D402D021RECT
T003POWER TRANSFORMER
ISOLATORPC005
ISOLATORPC006
ISOLATORPC007
D101RECT
D102
ISOLATORPC002
ISOLATORPC004
ISOLATORPC001
D006
Q003
SWITCHINGQ001, 002
D032
TH002
D002RECT
SWITCHING REGULATORIC002
5
6
2
4
8OUT
VCC
CS
GNS
SWITCHING REGULATORIC001
5
6
2
4
8OUT
VCC
CS
GNSFB
FB
TH002
D002RECT
L002 L001
ACOUTLET
POWER ON/OFFRELAY DRIVER
Q401
RY001
Q912
SWITCHINGREGULATOR
IC003D014, 019
RECT
D015-018RECT
L010
-AC IN
SWITCHINGREGULATOR
BOARD
FROMMAIN MICRO
IC2601
7
2. Power Supply (Switching Regulator)
Troubleshooting ProceduresDead Unit (Testing Switching Regulator Loaded)
1) Check Standby Power Supply section.
a. Apply AC Power to AC IN connector (Reference Fig. 2-1).
b. Locate CN8 on Switching Regulator board (Reference Fig.A-5, Appendix A) .
c. Check for the following voltages:
i. CN8/pin3 +12V
d. If the voltages are missing or incorrect, the SwitchingRegulator is possibly defective. Go to “Testing SwitchingRegulator Unloaded” (Page 9) in the next section to
determine if the Regulator is defective or if there is anexcessive loading problem.
e. If CN8 voltage is correct, check the voltage output ofregulators IC912 and IC911 on the REG Board (ReferenceFig. 2-2)
8
2. Power Supply (Switching Regulator)
POWER CHG
FIGURE 2-2 - POWER SUPPLY/REGULATORS A126.2-2 6/17/04
SWITCHINGREG. BOARD
8
7
6
5
3
1
P-RELAY
STOP-12V+12VB+12V
CN908
CN8
POWER CHANGE Q914INVERTER
POWER RELAY
STOP
V POWER TO Q912
1
2
3
4
5
7
8
9
11
IC912+5V
1 3IC911+3.3V1 3
+5VB
+3.3VB
IC909+3.3V
1 3+3.3VDSP
IC910+5V1 3 +5VDSP
CN909
TODIGITALBOARDCN2701
REG. BOARD
4CN3 RY +12VCN1852 FRONT A/B
RELAY
TORY1680
&RY1690
1CN7+12V
CN851TO ZONETRIGGERCIRCUIT
D-AMPBOARD
CIS BOARD
8
7
6
5
3
1
2
4
2
4
DSP GROUND
FL GROUND
1
2 5GRND
1
2 2
+12V
+12V
+12V
2.6V
4V0.156V
GRND
9
2. Power Supply (Switching Regulator)
FIGURE 2-3 - AC JUMPER CABLEA126.2-3 6/2/04
ZIP-CORD
AC TWO-PRONG PLUGS
Testing Switching Regulator UnloadedTest Standby Power Supply Section
1) Completely unload the Switching Regulator. Disconnect the cablesto the following connectors on the Switching Regulator board:
CN1, CN2, CN3, CN4, CN5, CN7, CN8 (Reference Fig. A-5,Appendix A)
2) Apply AC Power to AC IN connector (Reference Fig. 2-1).
3) Locate CN8 on Switching Regulator board (Reference Fig. A-5,Appendix A) .
4) Connect Chassis Ground to CN8/pin 2.
5) Check for the following voltages:
a. CN8/pin3 +12V
6) If the voltages are missing or incorrect, the Switching Regulator isdefective
7) If the voltages are correct (unloaded), check for shorted conditionon the REG board at CN8 connector. This causes the voltages tosag when connected. Alternatively, the Switching Regulator circuitis defective and cannot handle the normal load. In this situation,the complete assembly must be replaced.
Test Main Power Supply Section1) The Switching Regulator should be completely unloaded asdescribed in Step 1 of the previous test procedure.
2) Construct a AC jumper cable with a zip cord and two male twoprong plugs at either end (Reference Fig. 2-3)
10
2. Power Supply (Switching Regulator)3) Insert one end of the AC Jumper Cable into the AC Outlet connectoron the rear of the AV Receiver.
!!!!Caution!!!! Never plug one end of the AC Jumper Cable intothe AC power source first and leave other end unconnected.Always connect to AV Receiver first and then connect to theAC power source.
4) Connect other end of AC Jumper Cable to AC power source.5) Steps 1 and 2 are performed to bypass the AC Relay RY001 on theSwitching Regulator board. NOTE: The AC Relay cannot be bypassedwith the Switching Regulator board connected due to timing problemswith system control. The AC relay will just pulse ON and OFF.6) Connect chassis ground to the following connector/pin and checkto the voltages on the associated connector pins (Reference Fig. 2-4):
a. CN1/pin 1 (Grnd)i. CN1/pin 2 (33V)
b. CN2/pin 2 (Grnd)i. CN2/pin 1 (+12V)
ii.CN2/pin 3 (-9V)c. CN4/pin 2 (Grnd)
i. CN4/pin 1 (+12V)ii.CN4/pin 3 (-12V)
d. CN5/pin 2 (Grnd)i. CN5/pin 1 (-12V)ii.CN5/pin 3 (+12V)iii. CN5/pin 5 (-12V)
7) If the voltages are correct (unloaded), check for shorted conditionon the REG board at CN8 connector that is causing the voltages tosag when connected. Alternatively, the Switching Regulator circuit isdefective and can handle the normal load. In this situation, the completeassembly must be replaced.
11
2. Power Supply (Switching Regulator)
FIGURE 2-4 - POWER SUPPLY/REGULATOR DIAGRAM A126.2-4 6/18/04
SWITCHINGREGULATOR BRD.
CN5
RY -12V+12V
-12V
CN4001
+12V 1
CN2
AC STOPVOL - SW
-9V
CN9015
4
3
CN4
+12 V-12V
1
3
CN906
CN12
V+BCN905
CN6 NOT USED ON 3000(CHECK 2000, 5000)
CN8 GO TO FIG. 2-2
CN3 GO TO FIG. 2-2
CN7 GO TO FIG. 2-2
IC4001+10V
1 2
3
IC4002-10V2 1
3 1
3
5
CN4002
TOAUDIOBOARDCNP605
+
-
SCREWTERMINALS
+
Q904
C913
R914+C910
Q905
R914
R917Q906
IC9031 5R918R920
R921Q908
Q909 4
3
1
2
5
2
1 TEMP5V
THERMISTORBOARD
2
1
R907 CN910
CN902
R908
TO D-AMPBOARDCN1853
IC905+9V
1
3
IC906-5V
2 3
IC904+5V
1
3
IC913-5V
6 1
3 4
5 2
-5V
+9V
Q913-5V SW
Q911
D901
D902+9V SW
Q9124
CN909
4
3
1
-5V
+9V
+12V
TOVIDEOBOARDCN3803
CN907
(V POWER)FROM
DIGITALBOARDCN2701
REG BOARD
1
3
5
2
3
5
1
2
2
11
5
4
3
1
2 2
1
3
2 2
+12V+10V
33V TO 68V(-0db) (-20db) (+0db)6.7V / 33V / 68V
38,8V (-0db)START INCREASE (-20db)68V (+0db)
-10V
VOL DC
AC-STUPVOL-SW
(-20db) (+10db) 0.5V 5V
+12V
+9V
+5V
-12V+5V
TO D-AMPBOARD
(-0db) (110db) 1V 11V
TOD-AMPBRD
GRND
GRND
GRND
GRND
12
2. Power Supply (Switching Regulator)
Testing REG BoardWhen troubleshooting the regulators on the REG board, keep in mind thatsome regulator output feeds other regulator inputs, and that all regulatorsare not ON all the time. Some regulators are switched ON only for specificfunctions (e.g. Video Output function). Voltages to the Video board CN3803are present only when the video outputs are selected.
The following is a description of the configuration of the regulators andhow to confirm proper operation.
Regulator ConfigurationReference Figures 2-2 and 2-4 for the following descriptions:
1) IC912 (+5V) and IC911 (+3.3V) are the Standby Voltage regulatorsand they will be ON constantly. Both regulator inputs come fromthe Switching Regulator on separate outputs.
2) IC909 (+3.3V) and IC910 (+5V) are the DSP’s voltage source. Theyboth are supplied +12V directly from the Switching Regulator.These regulators are switched ON with the AC Relay.
3) IC4001 (+10V) and IC4002 (-10V) are the Audio board voltagesource. They are supplied +12V and -12V respectively directlyfrom the Switching Regulator. These regulators are switched ONwith the AC Relay.
4) IC905 (+9V), IC906 (-5V) and IC904 (+5V) are the Video boardvoltage source. Both IC905 and IC906 inputs come directly fromthe Switching Regulator on separate outputs. IC904 receives itsinput from IC905’s output. Notice that although the regulators areON constantly, their outputs are switched going to CN907 throughIC913 or Q913. These outputs are applied to CN907 only whenVideo 1, 2 or 3 functions are selected. Q912 and Q911 provide theswitching signals when the VPOWER signal is supply from themicroprocessor.
Switching Circuit for Audio-Output Circuit Voltage Source (Mid-Range Volume Control)
Reference Figure 2-4The volume control for the STA-DA5000, 3000 and 2000 is performed inthree stages.
The first volume stage range is –0db to –30db (ref. meter on display).The control of the volume is achieved in this range by varying the outputpulse width of the separate PCM/PWM processors.
The second volume stage range (or Mid-Range) is –30db to –10db.The control of the volume is achieved in this range by varying the source(or rail) voltage to the audio output stages, the Digital Amp and MOSFETswitching transistors to be exact.
The third volume stage range is –10db to +10db. The control of thevolume is achieved in this range by further varying the output pulse widthoutput of the separate PCM/PWM processors.
The first and third volume stages are accomplished through the MainVolume Control – Main Micro – PCM/PWN serial data communication.
The second volume stage (mid-range) is accomplished through the MainVolume Control – Main Micro – Control Circuit (reference Figure 2-4).The Control Circuit consists of IC903, Q906, Q908, Q909, Q905 and Q904.Q906, Q905, Q904 and C913 are used to increase the volume.
Q908, Q909 and C913 are used to decrease the volume.
13
2. Power Supply (Switching Regulator)Testing the Volume Control Circuit:Reference Fig. 2-4.
1) Check overall operation. Check Q904 output (drain) voltage asthe volume is varied. The voltage should track the “db” level (viewthe db meter on the display) as follows: If the voltage is notreasonably tracking the db level, proceed to the next step.
a. 6.7V at –0db
b. 33V at –20db
c. 68V at +0db
d. 68V for remain volume increase
2) Check control voltages at IC903. The input to IC903/pin 5 (VOL-DC) is the mid-range volume control signal from the Main Microand should track as follows:
a. Increase linearly from 0.5V to 5V starting at –20db to +10db.
b. The output IC903/pin 1 increases linearly from 1V to 11V.
3) Decreasing volume check. Probe the base of Q908 and begindecreasing the volume. The base voltage should pulse low whichwill turn OFF Q908 and turn ON Q909. When Q909 is turned ON,the voltage on C913 is decreased, which decreases the supplyvoltage to the audio output stages. This decreases the volume.
14
3. Analog & Digital Audio System
Chapter 3 - Analog & Digital Audio System
OverviewThe following sections will cover the 2-Channel, Multi-Channel andDigital-Channel audio processes. Clear and simplified signal pathdiagrams are presented for easier signal tracing for all three audio channelstypes. First, an overall block including all channels is presented, theneach separate channel type is considered in more detail in succeedingsections and diagrams. A board level diagnosis flow-chart accompanieseach section.
The troubleshooting process presented in this chapter is laid out to firstuse the flow-charts and overall block diagram to diagnose the problem toboard level, and then proceed to the specific detailed board diagram totroubleshoot to component level. The main troubleshooting tools are theaudio inputs and outputs.
15
3. Analog & Digital Audio System
IC1401PCM/PWM
IC1950DIGITALFILTER
DATA7.1
4CH
IC2502BUFFER
DATA7.1
4CH
IC2426GPR
DATA7.14CH
IC2251DSP
IC2201DSP
(NOISEGEN.)
LCH IC321AMP
IC322AMP
IC326SWITCH
IC327BUFFER
IC341INPUT
SELECT
LCH RY641IC643LINEAMP
IC642TONE/VOL
IC641BUFFER
FIGURE 3-1 - 2CH, MULTI-CH & DIGITAL SIGNAL PATH OVERALL BLOCK A126.3-1 6/18/04
PHONO IC301(EQ)
CD/SACD IC611
MD/DAT IC613
TAPE IN IC615
TV/SAT IC616
DVD IC617
VIDEO 2 IC619
VIDEO 1 IC621
IC401 INPUT SELECT (LCH)
MD/DAT OUT
TAPE OUT
VIDEO 2 OUT
VIDEO 1 OUT
IC612
IC614
IC618
IC620
BUFFERS
J605
J606
J607
J608
BUFFERS
2CHINPUTS
2CH OUT(LCH)
ZONE 2J609
AUDIO BOARD
2CH OUT(LCH)
DIGITAL BOARD2CH IC3010
A/D (PCM)
DATA7.1
4CH
TO REGBRD (D/A)AND THEN
PRE-OUT BRDDIGITALAUDIO INPUTS
IC2204CONT. FROM
FIG. 3-7
IC1906BUFFER
IC1511DED
IC1521DED
Q1651
Q1671
Q0330
Q1681
LEFT/A SPK +
LEFT/A SPK -
IC1531DIG.AMPS
IC1541DIG.AMPS
IC111ANALOG SUB BOARD
IC1910 IC2501IC2401GPR
IC2012A/D
D-AMP BOARD
ANALOG AUDIOOUTPUTS
MULTI-CHANNEL1 & 2
2CH
MULTI-CHANNEL1 & 2
16
3. Analog & Digital Audio System
Overall Audio Block DiagramNOTE: Only Left (L) audio signal path is shown for simplicity in the diagram.All other signal paths follow a similar route with only a change in IC pinnumbers.
The overall block diagram in Figure 3-1 gives a simplified view of the 2-Channel, Multi-Channel and Digital-Channel audio signal paths. NOTE:The overall systems block diagram (Ref. Fig. 1-1) gives an even simplerview and can be used to troubleshoot this section to board level.
The main thing to notice in Figure 3-1 is how the three input sources (2-Ch, Multi and Digital) divide the block into three distinct sections.
Reference Figure 1-1
1) Signals from the 2-Channel inputs will test the complete audioprocessing path from inputs to speaker outputs.
2) Signals from the Multi-Channel inputs bypass the 2-Channelselector and the DSP processing circuits. The signals are thenapplied directly to the PCM/PWM processor and speaker drivecircuits.
3) The Digital (or Optical) inputs are applied directly to the firstDSP IC and completely bypasses the Audio board.
These are key ideas to keep in mind when troubleshooting. They providethe means of diagnosing a problem quickly to a particular section or board.
The following two flow-charts (Flow Chart 1 and 2) are step-by-step boardlevel troubleshooting tools derived from the above three “divide andconquer” concepts. Notice that at the point where the flow-chart predictsa defective board, it then points to a particular figure for detailed componentlevel troubleshooting of the suspect defective board.
Flow Chart 1 is based on using the 2-Channel inputs as the initial signalsource and then midway through it uses the Digital inputs to further dividethe system. NOTE: There is not separate flow-chart for the Digital inputsignal path. The 2-Channel (Flow Chart 1) flow-chart can be used fromthe mid-point on to troubleshoot the digital path.
Flow Chart 2 in based on using the Multi-Channel inputs as the initialsignal source and then towards the end, the 2-Channel inputs are used tofurther divide and troubleshoot the path.These troubleshooting flow-charts are obviously especially good for noaudio output defects, but they can also be very effective in tracking downat what point in the circuit a audio distortion is being introduced. Onceagain, the “divide and conquer” method is used to apply various inputsand bypass circuits to determine if the distortion is still present.
17
3. Analog & Digital Audio System
DEFECT OND-AMP BRD.
DEFECTIVEIC2010 ON
DIGITAL BRD.
YES
CHECK AUDIO ONCNP601/PINS 1 & 3CN621/PINS 5 & 3
(ANALOG SUB. BRD.)
DEFECT ONAUDIO BOARD
NOGO TO FIGS 3-2THRU 3-4 FORCOMPONENTLEVEL DETAIL
FLOWCHART 3-1 - FLOWCHART FOR AUDIO (2CH) PATH BOARD LEVEL DIAGNOSTICS
*UNIT POWERS UP WITH NOAUDIO
NOTE:*INPUT AUDIO SIGNALINTO SEPARATEMULTI-CH INPUTS TOTEST SEPARATECHANNELS ( ORSPEAKERS).*MULTI--CH AUDIOGOES THROUGH THEAMPLIFIERS ONANALOG SUB. BOARD.
NO OR DISTORTED2CH AUDIO OUTPUT
SPEAKERS
INPUT 2CH AUDIO(E.G. CD/SACD)
YES
YES
Go to Appendix A forBoard & Connector
Locations
Check SpeakerAudio Output
(Present?)
INPUT AUDIOAT DIGITAL (OPTICAL)
INPUTS (E.G., CD/SACD)
NOTE: THE ANALOG SUB BRD. IS ONLY AFEEDTHROUGH FOR 2CH AUDIO
GO TO FIG. 3-6FOR COMPONENTLEVEL DETAIL
NO
Check Pre-OutAudio Output
(Present?)
DEFECT ONDIGITAL OR
PRE-OUT BRD.OR REG.
NOCHECK ANALOGPRE-OUT AUDIO
INPURTS. REF. FIG.3-8 (PRESENT?)
DEFECTON
PRE-OUTBRD.
GO TO FIG. 3-8FOR COMPOUND
DETAILDEFECT OND-AMP BRD.
GO TO FIGS. 3-9 & 3-10FOR COMPONENT DETAIL
YESNO
YES
Check SpeakerAudio
(Present?)
NO DEFECT ONREG. BRD.
GO TO FIG. 3-8FOR COMPONENT
DETAIL
YES
Go to Appendix A forBoard & Connector
Locations
2 CHANNEL TEST FLOWCHART
DEFECT ONANALOG SUB
BOARD
NOGO TO FIG. 3-6COMPONENTLEVEL DETAIL
CHECK AUDIO ONCNP620/CNP622 INPUT
ANALOG SUB BRD.(PRESENT?)
DEFECT ONAUDIO BOARD
NO GO TO FIG. 3-5COMPONENTLEVEL DETAIL
FLOWCHART 3-2 - FLOWCHART FOR MULTI-CH AUDIO PATH BOARD LEVEL DIAGNOSTICS
NOTE: HEADPHONE OUTPUT CAN BEUSED TO CHECK THE OUTPUT OFIC1401 (L/R) PCM/PWM PROCESSORAND BYPASS OUTPUT CIRCUITAFTER IC1401 INCLUDING THESWITCHING DRIVE MOSFETS FORTHE L&R SPEAKER OUTPUTS.REF. FIGs. 3-9 & 3-10
NO/DISTOREDAUDIO OUTPUT
INPUT MULTI 1 OR 2AUDIO SIGNALS
YES
CHECK AUDIO ONCNP601 & CNP602
OUTPUT ANALOG SUBBOARD
(PRESENT?)
YES
INPUT A 2CH SIGNAL.CHECK SPEAKER AUDIO.
(PRESENT?)
DEFECT ONDIGITALBOARD
YES
DEFECT OND-AMP BRD.
GO TO FIGS. 3-9 & 3-10COMPONENT LEVEL
DETAIL
NO
REF.FIG. 3-6
REF.FIG. 3-6
GO TO FIG. 3-5COMPONENTLEVEL DETAIL
MULTI-CHANNEL TEST FLOWCHART
18
3. Analog & Digital Audio System
Troubleshooting Tips Per BoardAudio BoardReference Fig. 3-1 (Overall Block)
Troubleshooting the Audio board is just a matter of analog audio signaltracing. The Audio board can be further divided to isolate a defect bymonitoring the analog outputs (e.g. MD/DAT) and Zone 2.
Apply a signal to any 2-Channel input.
1) Check analog outputs (e.g. MD/DAT).
a. No audio. Defect at Input/Output Buffers or Switching IC501and/or IC401 (Ref. Fig. 3-2).
b. Audio Present. Go to next step.
2) Check Zone 2 output.
a. No audio. Defect in Zone 2 signal path from IC641 to RY641(Ref. Fig.3-3).
b. Audio Present. Go to next step.
3) Check audio signal path from IC341 to IC321. This is the audiosignal path for the Pre-Out and Speaker outputs (Ref. Fig. 3-4)
19
3. Analog & Digital Audio System
FIGURE 3-2 - 2CH SIGNAL PATH A126.3-2 6/7/04
IC501INPUT SELECT (R)
2
3
40
5
38
7
36
8
55
9
34
PHONO
CD/SACD IN
MD/DAT IN
TAPE IN
TV/SAT IN
DVD IN
4
6
10
12
15
16
28
MD/DAT OUT
TAPE OUT
VIDEO 2 OUT
VIDEO 1 OUT
L COMOUT
11 32 13 30 29
VIDEO 1IN
VIDEO 1IN TUNER IN
IC401INPUT SELECT (L)
2
3
40
5
38
7
36
8
55
9
34
PHONO
CD/DVD
MD/DAT IN
TAPE IN
TV/SAT IN
DVD IN
4
6
10
12
15
16
27
28
MD/DAT OUT
TAPE OUT
VIDEO 2 OUT
VIDEO 1 OUT
L COMOUT
13 30 14 29
VIDEO 1IN
TUNERINVIDEO
AUDIOIN
IC6215
3
L
R1
7
VIDEO 2AUDIO
INIC619
5
3
L
R
1
7
DVDAUDIO
INIC617
5
3
L
R
1
7
TV/SATAUDIO
INIC616
5
3
L
R 7
1
TAPEIN
IC6155
3
L
R
1
7
MD/DATIN
IC6135
3
L
R
1
7
PHONOIN
IC301(EQ)
3
5
L
R
7
1
CD/SACDIN
IC6115
3
L
R
1
7
11
32
VIDEO 2IN
TO IC612
TO IC614
TO IC618
TO IC620
TO IC641(GO TOFIG. 3-3)
TO IC341(GO TOFIG. 3-4)
TO IC612
TO IC614
TO IC618
L
R
L
R
R
R
R
L
R
L
R
L
R L
L
L
L
L
L
L
L
R COM OUT
R COM OUT
R
R
R
R
CN617 CNP920 TUNER
TUNER RTUNER R
3
1
7
9
AUDIO BRD.ANALOG
SUB BRD.
CNP601 CN2052
10
8
CN20519
11
1
3
R
L
DIGITALBOARD
L COMOUT
27
14
TO IC641GO TOFIG. 3-3
TO IC341GO TOFIG. 3-4
L
R
L
R
L
R
20
3. Analog & Digital Audio System
+C442
+C542
IC642VOL/TONE
CONTINUEDFROM
FIG. 3-2
FIGURE 3-3 - 2 CH SIGNAL PATH (ZONE 2 OUTPUT) A126.3-3 6/7/04
IC641BUFFER
5
3
7
1
L
R
FROMIC401/PIN 15
FROMIC501/PIN 15
20
9
25
23
24
5
6
4
IC643AMP
5
6
2
3
C543
C443+
+
INFB
FB
OUTIN
IN OUT
FB
7
1
L OUT
R OUT
RY641
L
R
J609ZONE 2
OUT
AUDIO BOARD
FBIN
21
3. Analog & Digital Audio System
+C122
+C222
+C126
+C226
+C127
+C227
CONTINUEDFROM
FIG. 3-3
FIGURE 3-4 - 2 CH SIGNAL PATH A126.3-4 6/7/04
L
R
FROMIC401/27
FROMIC501/27
IC327BUFFER
5
3
7
1
IN
IN
L OUT
R OUT
IC341INPUT
SELECT
40
3
37
6
IN
IN
L OUT
R OUT
IC326VOL
37
6
41
2
IN
IN
L OUT
R OUT
IC322AMP
2
6
1
7
IN
IN
L OUT
R OUT
AUDIO BOARD
IC321AMP
2
6
1
7
IN
IN
L OUT
R OUT
L
R
5
7
5
3
CNP617 CNP620
ANALOG SUBBOARD
1
3
4
6
CNP601 CNP2052
DIGITALBOARD
LR
TO IC2010GO TOFIG. 3-5
22
3. Analog & Digital Audio SystemAnalog Sub BoardReference Fig. 3-5Troubleshooting the Analog Sub board is just a matter of analog audiosignal tracing. The 2-Channel audio signal passes through the AnalogSub board with no processing, while each Multi-Channel signal is appliedto an amplifier on the Analog Sub board.
This configuration can be used to quickly troubleshoot this board for a NoAudio symptom.
Assuming that the Audio board has been confirmed good per thetroubleshooting tips in the previous section, if there is speaker audio witha 2-Channel signal, but not with one of the Multi-Channel signal outputsthen that would indicate a failed amplifier on the Analog Sub board (Ref.Fig. 3-5). Each signal path of the Multi-Channel input can be checkedusing the internal Noise Generator.
23
3. Analog & Digital Audio System
IC341INPUT
SELECT
4
35
8
L
R
SLSR
6
IC2401GPR
20
22
24
37
J601J602J603
MULTI.CH.INPUT 1
7.1
FIGURE 3-5 - MULTI-CH INPUT SIGNAL PATH (AUDIO/ANALOG SUB/DIGITAL BOARDS) A126.3-5 6/16/04
39
31BL
12BR
27C
33
21
19
16W
5
34
9
LR
SLSR
J604MULTI.CH.
INPUT 25.1
38
26C
17W
IC327BUFFER
5
3
7
1
L
RIC326
SELECT
37
6
30
31
IC312AMP
3
5 7
1C
W
L
R
29
SL
SR
SBL
SBR
AUDIO BOARD
10
14
IC311BUFFER
3
5 7
1
IC313BUFFER
3
5 7
1
C
W
SL
SR
SBL
SBR
IC11161
7
IC21167
1L
R33
10
+L-L
+R-R
+C-C
+W-W
+SL-SL
+SR-SR
+SBL-SBL
+SBR-SBR
19
16
15
14
13
DSD L 2
3DSD R
4DSD C
5DSD W
5DSD SL
5DSD SR
5DSD SBL
5DSD SBR
DSD LDSD RDSD CDSD WDSD SLDSD SRDSD SBLDSD SBR
IC2501BUFFER
13
11
12
14
15
16
17
18
9
8
7
6
5
4
3
2
DSD LDSD RDSD CDSD WDSD SLDSD SRDSD SBLDSD SBRDSD SBRDSD SBLDSD SRDSD SLDSD WDSD CDSD RDSD L
ANALOGSUB BOARD
TO D-AMPBOARDIC1910GO TOFIG. 3-9
TO REG BOARDTHEN PRE-OUT
IC941GO TOFIG. 3-8
DIGITAL BOARD
IC16161
7
IC26161
7
IC14161
7
IC24161
7
IC18161
7
IC28161
7
CN619 CN6221 4
2 3
6 2
7 1
CNP618 CNP621
3 2
4 1
CNP619 CNP622
8 2
9 1
CNP617 CNP620
IC2012A/D
(DSD)
17
16
4
5
DSD L
DSD R
12
11
IC2014A/D
(DSD)
17
16
4
2
DSD C
DSD W
12
11
IC2013A/D
(DSD)
17
16
4
2
DSD SL
DSD SR
12
11
IC2015A/D
(DSD)
17
16
4
2
DSD SBL
DSD SBR
12
11
DIGITAL BOARD
6 9
5 8
7 10
8 11
CNP601 CN2052
7 7
6 6
8 8
9 9
CNP602 CN2053
2 2
3 3
4 4
5 5
11 11
10 10
12 12
13 13
24
3. Analog & Digital Audio SystemDigital Board
Reference Figure 3-6 and 3-7Internal Pink/White Noise Generator: The internal noise generator islocated in the first DSP IC2201. This generator can be used to troubleshootthe circuits on the Digital board.
Noise signals are sent sequentially to all the speaker outputs or to a fixedspeaker output depend on the menu setting. The signal path will befrom IC2201 DSP to the Speaker Outputs
The noise generator will divide the system at the point where the Digital(Optical) input is applied to the DSP IC2201. The noise generator can beused to determine if a Digital Optical Input or the DSP section is defective.If a signal is applied to the Digital Optical Input and no speaker audio ispresent, but audio is present when the Noise Generator is activated, thenthis would indicate a defect in the Digital Optical Input circuit (Ref. Fig. 3-7), which consists of the following ICs:
Digital Optical Input Circuit:
IC2001 thru IC2004 and IC2006
Coax Input
IC2005
IC2007
IC2121
IC2204
If the noise is not present a the speaker outputs, then this would indicatea defect in one of the DSP IC2201 or IC2251 and the succeeding circuit ofIC2426 and IC2502 (Ref. Fig. 3-6).
25
3. Analog & Digital Audio System
IC2251DSPPCMFROM
IC321CONT.FROM
FIG. 3-4CN2052
FIGURE 3-6 - 2 CH SIGNAL PATH A126.3-6 6/7/04
L
R
IC2201DSP
18
30
IN
OPTICALDIGITALIN
OUT
IC2010A/DPCM
1
2
12IN
IN
OUT
DIGITAL BOARD
FROMIC2121CONT.FROM
FIG. 3-8
OUT
OUT
OUT
27
28
35
39
IN
IN
OUT
OUT
OUT
OUT
IN
IN
DATA L/R23
24
25
26
DATA C/W
DATA SL/SR
DATA SBL/SBR
L/R60
61
25
26
C/W
SL/SR
SBL/SBR
IC2426GPR35
36
37
38
IN
IN
OUT
OUT
OUT
OUT
IN
IN
L/R22
21
20
19
C/W
SL/SR
SBL/SBR
IC2502BUFFER
9
8
7
6
IN
IN
OUT
OUT
OUT
OUT
IN
IN
11
12
13
14
9 12 144 139
13 12 11 10
23 24 25 26
D-AMP BOARD SBL/SBRSL/SRC/WL/R
SBL/SBRSL/SRC/WL/R
TOIC1900GO TOFIG. 3-9
TOIC9400GO TOFIG. 3-8
22 23 24 25
4 3 2 1
REG BOARD
X220113.5 MHX
X225113.5 MHX CN2006
CN1901
CN1902
CN911
26
3. Analog & Digital Audio System
FIGURE 3-7 - DIGITAL SIGNAL INPUT DIAGRAM A126.3-7 6/15/04
MO/DATINPUT
IC2007BUFFER
3 6IC2001
OPTICALOUT
3
IC2004OPTICAL
IN1
IC2003OPTICAL
IN1
DVDINPUT
TV/SATINPUT
IC2002OPTICAL
IN1
IC2000OPTICAL
IN1CD/SACD
INPUT
MD/DATINPUT
IC2005 INPUT
SELECT
1
3
2
4
12
14
15
IN
IN
IN
IN
IN
IN
IN
5OUT IC2007SWITCH
72IC2121
I/FRECEIVER
16DSD
3IC2204D-0UT
SWITCH613
DSDDIGITALAUDIOGO TOFIG. 3-6
COAXIALINPUTS
DVD
CD/SACD
IC2006WAVE
SHAPER69
IC2006WAVE
SHAPER213
IC1006OPTICAL
IN
VIDEO 3INPUT
J2000
27
3. Analog & Digital Audio System
IC940BUFFER
2
9
8
7
DATA LR
DATA CW
DATA SL/SRDATASBL/SBR
DSDW
11
DSDW
CW
SL/SR
SBL/SBR
IC941BUFFER
9
7
6
5
DSD L
DSD R
DSD C
DSD W
DSDW
12
L/R
DSD L
DSD R
DSD C
8
DSD SL
4DSD SR
3DSD SBL
2DSD SBR
13
14
11
12
13
18
DSD SL
DSD SR
DSD SBL
DSD SBR
15
16
17
18
FROMIC2502DIGITALBOARD
FROMIC2501DIGITALBOARD
IC2801D/A
43
48
46
49
47
40
41
42
38
39
44
45
10
9
11
29
28
31
L
R
SL12
SR
SBL
SBR
C
W
IC937LOW PASS
FILTER
5
3
7
IC936LOW PASS
FILTER
5
3
7
1
IC935LOW PASS
FILTER
5
3
7
1
IC934LOW PASS
FILTER
5
3
7
1
IC2912TONE/
VOLUME
9
20
30
5
23
6
24
IC2862TONE/
VOLUME
9
20
5
23
6
24
IC2812TONE/
VOLUME
9
20
5
23
6
24
IC2962TONE/
VOLUME
9
20 6 IC2963LINEAMP
1
7
2
5
3
6
IC2913LINEAMP
1
7
2
5
3
6
IC2863LINEAMP
1
7
2
5
3
6
IC2813LINEAMP
1
7
2
5
3
6
LR
SL
SR
SBL
SBR
C
W
REG BOARD PRE-OUT BOARD
L
R
SL
SR
SBL
SBR
C
W
J2957
J2915
J2875
J2815
SUB-WOOFEROUTPUT FOR
ALL SURROUNDMODES
FIGURE 3-8 - 2CH & MULTI-CH SIGNAL PATH (REG/PRE-OUT BOARDS)
1
5
23
24
11 11
13 13
7 7
9 9
3 3
5 5
1 1
CN913 CN2903
CN914 CN2904
CONT.FROM
FIG. 3-5
CONT.FROM
FIG. 3-5
A126.3-8 6/7/04
6 6
REG and PRE-OUT BoardsReference Figure 3-8The audio processing circuits on the REG board convert digital Multi-Channel information from the Digital board to analog signals, which thenare applied to the PRE-OUT board. The procedure for troubleshooting
the REG and PRE-OUT boards is described towards the end of Flow-Chart 3-1. Troubleshooting the PRE-OUT board and the output of theREG board is just a matter of analog audio signal tracing.
28
3. Analog & Digital Audio SystemD-Amp BoardReference Figures 3-9 and 3-10The digital audio circuits on the D-AMP board perform the PCM/PWMconversion and the Digital Power amplification processes. The process iscompletely digital right up to the speakers. The PCM audio signal (Ref.Waveform 3-1) from the Digital board is first converted to a comparablePWM signal (Ref. Waveform 3-2). The PCM/PWM processors produce adifferential (High and Low signal) to eliminate distortion. The differentialsignals are finally used to drive the Output Switching MOSFETs.
Power amplification is accomplished through two methods: 1) by varyingthe pulse-width of the PWM signal; and 2) by varying the supply voltage tothe Digital Amplifier ICs and the Output Switching MOSFET transistors.This process is described in more detail in Chapter 2 (Power Supply) inthe “Switching Circuit for Audio-Output Circuit Voltage Source (Mid-RangeVolume Control)” section.
Immediately after the Output Switching MOSFET, the PWM signal is appliedto a low-pass filter. The filter removes the high frequency component andwhat’s left is an analog audio signal to drive the speakers (Ref. Waveform3-7).
The Headphone outputs come from IC1401/pins 24, 18, 10 and 4 (Ref.Fig. 3-9 and 3-10). Checking these outputs will divide the output sectionin half for the Left and Right audio outputs. Notice that the headphoneoutputs will test the outputs of IC1401 only. Consequently, if there is a NoSpeaker Output condition on the Left or Right outputs then checkingheadphone outputs will determine if IC1401 PCM/PWM processor is atleast working properly.
The other PCM/PWM processors (IC1402, IC1403 and IC1404) outputswill have to be probed for the proper digital signal (Ref. Waveform 3-2).
Both High and Low-outputs of the DED ICs are fixed 5Vpp and applied tothe input of each Digital Amplifier (Ref. Waveform 3-3).
The supply voltage to the Digital Amplifiers and Output Switching MOSFETsis varied to control the output signal for the Mid-Volume range.
The High-output of the Digital Amplifiers are fixed 15Vpp (Ref. Waveform3-4) until the start of the mid-volume range (approx. –20db), where it willincrease to 75Vpp at maximum volume. The Low-output remains fixed at10Vpp (Ref. Waveform 3-5) over the complete volume range.
Example Output Speaker Drive Circuit Function:
The Digital amplifier IC1531/pin 3 high-output drives Q1651/gate with thesignal amplitude range of 15Vpp to 75Vpp depending on the volume setting.The high-side MOSFET provides the actual speaker drive signal. Thelow-output IC1531/pin 8 a fixed 10Vpp signal drives Q1671/gate. Thelow-side MOSFET insures a constant 0Vdc reference level for the outputdrive signal at the common MOSFET output (Ref. Waveform 3-6). TheOutput Switching MOSFETs are wired to form a half-bridge configurationvery similar to the configurations found in a switch-mode power supplyoutput stage. The MOSFETs alternately switch ON and OFF. For example,when Q1651 is ON, Q1671 is OFF and visa-versa.
29
3. Analog & Digital Audio System
H OUT Q1666G S
Q1686G DL OUT
H OUT Q1656G S
Q1676G DL OUT
H OUT Q1664G S
Q1684G DL OUT
H OUT Q1654G S
Q1674G DL OUT
IC1910BUFFER
3
4
6
DSD L
DSD R
DSD C
DSD SL
17
IC1900BUFFER
3
4
5
DATA L/R
DATA C
DATA SL/SR
2
DATA BL/BR
16
15
18
14
18
FROMIC2501DIGITALBOARD
FROMIC2502DIGITALBOARD
FIGURE 3-9 - 2CH & MULTI-CH (LEFT CHANNEL & CENTER) SIGNAL PATH (D-AMP BOARD)A126.2 6/16/04
2
7DSD SR
8DSD SBL
9DSD SBR
12
11
17 IC1950DIGITALFILTERDC CUT
41
42
43
44
IC1401PCM/PWM
PROCESSOR
50
49 21
18
24
15
43
IC1402PCM/PWM
PROCESSOR
50
21
18
24
15
43
16
13
IC1403PCM/PWM
PROCESSOR
50
21
18
24
15
49
43
IC1404PCM/PWM
PROCESSOR
50
21
18
24
15
49
43
DSD L
DSD R
DATA L/R
DSD C
DATA C
DSD SL
DSD SR
DATA L/R
DSD SBLDSD SBRDATA L/R
IC1511DEDTIME
12
2
8
6
IC1521DEDTIME
12
2
8
6
IC1513DEDTIME
12
2
8
6
IC1523DEDTIME
12
28
6
IC1514DEDTIME
12
2
8
6
IC1524DEDTIME
12
2
8
6
IC1516DEDTIME
12
2
8
6
IC1526DEDTIME
12
2
8
6
IC1531DIGITALPOWER
AMP
5
6
3
8
IC1541DIGITALPOWER
AMP
5
6
3
8
IC1533DIGITALPOWER
AMP
5
6
3
8
IC1543DIGITALPOWER
AMP
5
6
3
8
IC1534DIGITALPOWER
AMP
5
6
3
8
IC1544DIGITALPOWER
AMP
5
6
3
8
IC1536DIGITALPOWER
AMP
5
6
3
8
IC1546DIGITALPOWER
AMP
5
6
3
8
H OUTQ1651G S
Q1671G DL OUT
H OUT Q1661G S
Q1681G DL OUT
H OUTQ1653G S
Q1673G DL OUT
H OUT Q1663G S
Q1683G DL OUT
L/A SPK+
L/A SPK-
C+
C-
SL+
SL-
BL+
BL-
CONTINUEDFROM
FIG. 3-5
CONTINUEDFROM
FIG. 3-6
REF.WAVEFORM 3-1
REF.WAVEFORM 3-2
REF.WAVEFORM 3-3
REF.WAVEFORM 3-4
REF. WAVEFORM 3-5REF. WAVEFORM 3-6
D-AMP BOARD
30
3. Analog & Digital Audio System
FIGURE 3-10 - RIGHT CHANNELS SIGNAL PATH A126.4 6/7/04
+
-
IC1401PCM/PWM
PROCESSOR
10
7
4
1
+
-
+
-
IC1403PCM/PWM
PROCESSOR
10
7
4
1
+
-
+
-IC1404
PCM/PWMPROCESSOR
10
7
4
1
+
-
IC1512DEDTIME
12
2
8
6
IC1522DEDTIME
12
2
8
6
IC1515DEDTIME
12
2
8
6
IC1525DEDTIME
12
2
8
6
IC1517DEDTIME
12
2
8
6
IC1527DEDTIME
12
2
8
6
IC1542DIGITAL
AMP
5
6
3
8
IC1532DIGITAL
AMP
5
6
3
8
IC1545DIGITAL
AMP
5
6
3
8
IC1535DIGITAL
AMP
5
6
3
8
IC1547DIGITAL
AMP
5
6
3
8
IC1537DIGITAL
AMP
5
6
3
8
Q1682
Q1662G
G
S
DR A & B
SPEAKER -
Q1672
Q1652G
G
S
DR A & B
SPEAKER +
Q1685
Q1665G
G
S
DSR-
Q1675
Q1655G
G
S
DSR+
Q1687
Q1667G
G
S
DSBR-
Q1677
Q1657G
G
S
DSBR+
49DSDRFROMIC1910
43DATA/LRFROMIC1950CONTINUED FROMFIG. 3-9
49DSD SRFROMIC1910
43DATA SL/SRFROMIC1950CONTINUED FROMFIG. 3-9
49DSD SBRFROMIC1910
43DATA BL/BRFROMIC1950CONTINUED FROMFIG. 3-9
CONTINUED FROMFIG. 3-9
CONTINUED FROMFIG. 3-9
CONTINUED FROMFIG. 3-9
31
3. Analog & Digital Audio System
WAVEFORM 3-1
3Vpp
2V/div2 S/divu
WAVEFORM 3-2
5Vpp
2V/div2 S/divu
WAVEFORM 3-3
5Vpp
2V/div2 S/divu
WAVEFORM 3-4
14Vpp
5V/div2 S/divu
WAVEFORM 3-5
9Vpp
5V/div2 S/divu
WAVEFORM 3-6
6.5Vpp
2V/div2 S/divu
WAVEFORM 3-7SPEAKER OUTPUT TERMINALS
10Vpp
u5V/div500 S/div
32
4. Video Processing System
Chapter 4 - Video Processing System
Overall Video BlockReference Fig. 4-1
IC3751SWITCH
FIGURE 4-1 - VIDEO SIGNAL PATH OVERALL BLOCK
COMPOSITVIDEOINPUTS
A126.4-1 6/16/04
IC3421INPUT
SELECT
V VVIDEO OUT2ND ZONE
IC3431INPUT
SELECT
VVIDEO 1 & 2OUTV
IC702C-INPUTSELECT
IC701Y-INPUTSELECT
IC3651OSD/VIDEO
SELECT
IC3521VIDEO
BUFFER
IC3501OSDAMP
IC3641AMP
MONITOROUT (V)
IC3641AMP
IC3601COMBFILTER
V
Y/C
OSDV & Y/C
Y/C
Y/C
S-VIDEO
IC3661SWITCH
IC3701CHROMADECODER
RY3301RY3302
S-VIDEOMONITOROUT(S-VIDEOBOARD)
Y/C Y/C
Y/B-Y/R-YCOMPONENTOUT
S-VIDEOINPUTS
Y/C
Y/C
IC3321VIDEOAMP
VIDEO BOARD
S-VIDEOBOARD
IC2601MAIN
MICRO
DIGITAL BRD.OSDDATA
TV & DVDCOMPONENTINPUTIC3741
Y/C
IC3671VIDEOAMP
OverviewReference Fig. 4-1The AV receiver accepts Composite, S-Video and Component inputs.The video process system can perform the following conversions:
• Composite > S-Video > Component
• S-Video > Component
NOTE: It does not perform any processing or conversions on componentvideo inputs, such as converting component to s-video or composite.
The receiver also generates its own OSD for all menus, which isgenerated by the Main Microprocessor IC2601
33
4. Video Processing System
Overall Video BlockReference Fig. 4-1
As illustrated on the overall block, all video processing and switching (exceptfor the S-Video switching) is performed on the Video board. The S-Videoinput switching is performed on the S-Video board. Consequently, if avideo problem exists, the most likely area where the defect is locatedwould be on the Video board. The next section provides a troubleshootingflow-chart and diagrams for troubleshooting.
The main feature to notice about Figure 4-1 is how the diagram can bedivided into separate sections depending on the input applied and theoutput viewed.
For example:
1) The Composite, S-Video, or OSD inputs can be applied to bypassswitching section. For example, applying a signal to the compositeinput bypasses the S-Video input select circuit and visa-versa. TheOSD will bypass both the composite and s-video input selectcircuits. NOTE: The S-video input bypasses the Comb-Filter andgoes directly to the switch IC3751.
2) The Video outputs (1, 2 and 2nd Zone) can be used to check theswitching ICs only. If these outputs are present, the Input Selectcircuit is OK.
3) The Monitor Out (V) when viewed divides the video processingsection basically in half. This confirms all ICs to the left of IC3651on Figure 4-1 (including IC3651) are OK.
4) The S-Video Monitor and Component Outputs can be used tobypass each other.
Video Section TroubleshootingNOTE: Reference Figure 4-1, the overall block diagram, while followingFlow-Chart 4-1. The idea is to use the troubleshooting flow-chart 4-1 toboard level diagnosis. The flow-chart will then point to a more detaileddiagram to troubleshoot to component level if necessary.The initial symptom at the start of flow-chart 4-1 assumes “No Video” atthe Component and/or S-Video outputs. Although the “No Video” symptomis used to start flow-chart 4-1, it can be substituted with “Distorted Video”to diagnose a distortion issue.
34
4. Video Processing System
INPUT S-VIDEOSIGNAL
DEFECT IN IC3651OR IC3641
NOGO TO FIG. 4-2COMPONENTLEVEL DETAIL
FLOWCHART 4-1 - FLOWCHART FOR VIDEO PATH COMPONENT LEVEL DIAGNOSTICSA126FLOWCHART.4-1 6/8/04
NO COMPONENT OR S-VIDEO MONITOR OUT
NOTE: REFERENCE VIDEO SIGNAL PATH OVERALL BLOCK FIG. 4-1 WHILE FOLLOWING FLOWCHART
"NO VIDEO"
INPUT COMPOSITE(V) SIGNAL
CHECKVIDEO 1 & 2
OR ZONE 2 OUTPUT(PRESENT?)
DEFECT IN IC3421OR IC3431
NOGO TO FIG. 4-2COMPONENTLEVEL DETAIL
YES
CHECKMONITOR OUT (V)
(PRESENT?)
YES
CHECKCOMPONENT& S-VIDEO
MONITOR OUTPUT(PRESENT?)
YESGO TO FIGS. 4-2& 4-3COMPONENTLEVEL DETAIL
NO S-VIDEOMONITOR (ONLY)J701
DEFECT IN IC3641OR IC3601
DEFECT IN IC3661OR IC3671
GO TO FIG. 4-3COMPONENT LEVEL DETAIL
DEFECT INONE OF
FOLLOWINGCOMPONENTS:IC3741, IC3701,IC3321, RY3301
RY3302
GO TO FIG. 4-3COMPONENT LEVEL DETAIL
NOTE: S-VIDEO BOARD MUST BE CONNECTED INORDER FOR SELE CT LINES TO FUNCTION.ALL PULL-UP RESISTORS ARE LOCATED ONS-VIDEO BOARD.
DEFECTIVEIC3751
GO TO FIG. 4-3COMPONENT LEVEL DETAIL
NO COMPONENTOUTPUT
J3301(ONLY)
NO VIDEO ,S-VIDEO,OR COMPONENT
OUTPUT
35
4. Video Processing System
FIGURE 4-2 - COMPOSITE VIDEO SIGNAL FLOW
C3401
A126.4-2 6/15/04
C3403
C3405
C3407
IC3421INPUT
SELECT
3
5
9
13
7
IN
IN
IN
IN
IN
IC3431INPUT
SELECT
3
5
9
13
7
IN
IN
IN
IN
IN
TV/SAT
DVD/LD
VIDEO 2
VIDEO 1
CNS741
S-VIDEOBRD.
CN5742
15
3
J1002
CN1019
VIDEO 3BRD.
VIDEO 3INPUT
1OUT J3403 (2ND ZONE)
11
15
1
J3402 (VIDEO 2 OUT)
J3402 (VIDEO 1 OUT)
OUT
OUT
OUT
IC3641OSD/VIDEO
SWITCH
12 IN 14 IC3641VIDEOAMP
1 4C3643
+
+IC3451VIDEOAMP
1 4
TOJ3401MONITOROUT(COMPOSITE)
C3645+
C3647+
C3606+
Q3641BUFFER
TO IC3601GO TO FIG. 4-3
VIDEO BOARD
CN3804
2
8
+
+
+
+C3428
+
C3402+
C3404+
C3406+
C3408+
C3436+
C3452WAVEFORM4-1
WAVEFORM4-2
R3643R3644
WAVEFORM4-10
36
4. Video Processing System
IC3701CHROMADECODER
Y IN
C INY
B-Y
R-Y
IC3321VIDEOAMP
Y
B-Y
R-Y
FIGURE 4-3 - COMPOSITE VIDEO SIGNAL PATH
IC3601COMBFILTER
VINFROMQ3641CONT.FROMFIG. 4-2
A126.4-3 6/16/04
2
9
7
Y
C
Q3621B EC3622
Q3631B EC3632
Q3622B E
Q3632B E IC3751SWITCH
5
12
3
13
From Q3651S-Video DierectContinued FromFig. 4-4
C IN
Y IN
4
C IN
Y IN
C OUT
14Y OUT
C3741 C3743
7C3325
18
4C3324
7
1C3323
6
32
34C3713
+
11
13
15
Y
B-Y
R-Y
RY3301
RY3302
J3301
Y/B-Y/R-YOUT
IC3741 VIDEO AMP
8 1
Y IN5 C IN
COUT
4
IC3661 MODE
SELECTIN
5IN
12
4
14
C3673
C3671
IC3671 VIDEO
AMPIN
1IN
8
5
4
C3672
C3675
YOUT
+
+
+
OUT
OUT
C
Y C702
C
Y
TOJ701S-VIDEOMONITOROUT
1
2
17
16
CN3804 CNS741
LPF SECTION
VIDEO BRD. S-VIDEO BRD.
+
WAVEFORM4-3
WAVEFORM4-4
WAVEFORM4-7
7) WAVEFORM 4-86) WAVEFORM 4-9
WAVEFORM4-6
+ +
WAVEFORM 4-5
37
4. Video Processing System
IC3651OSD/VIDEO
SWITCH
TV/SAT
FIGURE 4-4 - S-VIDEO SIGNAL PATH A126.4-4 6/7/04
S-VIDEO BOARD
IC702C-INPUTSELECT
22 C IN
1
16
14
19
10
5
8
C IN
C IN
C IN
C IN
C OUT
C OUT
COUT
IC701Y-INPUTSELECT
3 Y IN
5
9
13
7
1
11
15
Y IN
Y IN
Y IN
Y IN
Y OUT
Y OUT
YOUT
C713
C716
C726
C736
C741
DVD/LD
VIDEO 2
VIDEO 1
VIDEO 3(FROMVIDEO 3BOARD)
5
2
14
13
4
5
C
Y
C
Y
C
YCY
4C OUT
Y OUT 15
TO IC3751GO TOFIG. 4-3
TO J703VIDEO 2 OUT
TO J704VIDEO 1 OUT
VIDEO BOARD
CNS741 CN3804S-Video Inputs
38
4. Video Processing System
1.0Vp-p
WAVEFORM 4-1
IC3431/PIN 1
1.0Vp-p
WAVEFORM 4-2
IC3651/PIN 14
1.1Vp-p
WAVEFORM 4-3
IC3601/PIN 9
0.75Vp-p
WAVEFORM 4-4
IC3601/PIN 7
39
4. Video Processing System
1.4Vp-p
WAVEFORM 4-5
IC3701/PIN 32
1.2Vp-p
WAVEFORM 4-6
IC3701/PIN 34
1.2Vp-p
WAVEFORM 4-7
IC3701/PIN 8
1.7Vp-p
WAVEFORM 4-8
IC3701/PIN 7
40
4. Video Processing System
1.7Vp-p
WAVEFORM 4-9
IC3701/PIN 6
1.0Vp-p
WAVEFORM 4-10
IC3451/PIN 4
41
5. System Control System
Chapter 5 - Protection Circuits
FIGURE 5-1 - IRREGULAR OUTPUT CURRENT PROTECTION - L CHANNEL A126.5-1 6/7/04
L-
Q1661
Q1681
IC1541H-OUT
IC1541L-OUT
L+
Q1651
Q1671
IC1531H-0UT
IC1531L-OUT
R1711 C1731
6.7V
Q1721
FROM ALL OTHERPROTECTION
CIRCUITS LISTEDIN TABLE 5-1 R1701
R1893 C1892+
0V
3.3V TO SUB-MICRO
IC1800/PIN 1
33V TO 68V SUPPLYFROM REG BOARD
CHANNEL PROTECTION CIRCUIT L Q1721, R1631, R1641 R Q1722, R1632, R1642 C Q1723, R1633, R1643
SL Q1724, R1634, R1644 SR Q1725, R1635, R1645 SBL Q1726, R1636, R1646 SBR Q1727, R1637, R1647
TABLE 5-1 - PROTECTION CIRCUIT PER CHANNELEXCESSIVE CURRENT
NOTE: All channels use identical circuits.Left-channel is used here as anexample
0V Q1891INVERTER
0VNORMAL OPERATION
R16311W
R16411W
6.7V
OverviewThe following five protection circuits (with error code) found in the STR-DA5000, 3000 and 2000ES models are covered in this section:
1) Excessive Output Amplifier Current – Error 11
2) Power Supply Temperature – Error 12
3) Output Amplifier Temperature – Error 13
4) Output Amplifier DC Detection – Error 21
5) Output Amplifier B+ Detection – Error 22
Excessive Output Amplifier Current (Error 11)
42
5. System Control System
FIGURE 5-2 - OUTPUT AMPLIFIER & REGULATOR BOARD TEMPERATURE PROTECTION A126.5-3 6/16/04
TH1781
9V
MOUNTED NEAREACH AMPLIFIERSECTION
R1791Q1791
Q1781 TO SUB-MICROIC1800/PIN 35
R1781C1616
TH901
+5V
THERMISTORBOARD
MOUNTED ONREGULATORHEATSINK
R907 C906
TO SUB-MICROIC1800/PIN 3
TABLE 5-2 - AMPLIFIER TEMPERATUREPROTECTION CIRCUITS PER CHANNEL
D-AMPBOARD
REG BOARD
9V
R1771 R1761
Q1771+0.18V
+0.7V1CN910
+4V
L TH1791 & Associated Transistors R TH1792 “ “ “ C TH1793 “ “ “ SL TH1794 “ “ “ SR TH1795 “ “ “
SB/SBR TH1796 “ “ “
Transistor Q1721 and associated circuitry shown in Figure 5-1 monitorsthe flow of current through the output MOSFET transistor for the Left-Channel. There is an identical protection circuit connected to all the otheroutputs; these are listed in Table 5-1.
The current supplied to the output MOSFETs flows directly through thetwo 1W resistors, in the case of Figure 5-1 R1631 and R1641. These tworesistors are directly across the base/emitter junction of Q1721. Thevoltages on the base and emitter are equal in normal operation (6.7V). Asthe current increases due to a possible defective output, the voltage at the
emitter of Q1731 will remain constant while the voltage on the base ofQ1721 will decrease due to the voltage drop increase across R1631 andR1641. When the voltage drop reaches 0.6V, Q1721 turns ON, whichthen turns ON Q1891 and a low is applied to the Sub-Micro IC1800/pin1.
The above circuit description applies for all other excessive currentprotection circuits, only the component references change. The outputfor the other protection circuits is applied at the junction of R1893 andR1701 as shown in Figure 5-1, which then turns ON Q1891.
Regulator and Output Amplifier Temperature ProtectionCircuits (Error 12 and Error 13)
43
5. System Control System
FIGURE 5-3 - SPEAKER OUTPUT DC VOLTAGE DETECT CIRCUIT - L CHANNEL A126.5-2 6/16/04
Q1661
Q1681
IC1541H-OUT
IC1541L-OUT
L+
Q1651
Q1671
IC1531H-0UT
IC1531L-OUT
B+
B+
Q1751
D1316
0V
3.3V
3.3V
0V
3.3V
3.3V
Q1761
R1731
R1741
220K
220K
TO SUB-MICROIC1800/PIN 32
TABLE 5-3 - OUTPUT DC DETECTIONCIRCUITS PER CHANNEL
SPEAKER
L-
0Vdc
CHANNEL PROTECTION CIRCUIT L Q1751, Q1761 R Q1762, Q1752 C Q1763, Q1753 SL Q1764, Q1754 SR Q1765, Q1755 SBL Q1766, Q1756 SBR Q1767, Q1757
There is a thermistor mount near each channel’s output amplifier stage tomonitor the temperature as listed in Table 5-2. The resistance across thethermistor decreases as temperature increases. As the thermistorresistance decreases, the current trough it increases and the base voltageof Q1791 increases. Q1791 turns ON Q1781, which turns ON Q1771 andapplies a low to the Sub-Micro IC1800/pin 35.
Note: Error 12 indicates excessive temperature condition in one ofthe output channels. To determine which channel is causing theerror check the DC level at the base of each thermistor switchtransistor. For example, check the DC level at the base of Q1791 as
shown in Figure 5-2. If the voltage goes above 0.6V before the unitgoes onto protection that indicates the defective output stage.
Also shown in Figure 5-2 is the temperature monitoring circuit for theregulator board REG. Thermistor TH901 is mounted on the REG boardheat sink. The output of the thermistor is applied directly to the Sub-MicroIC1800/pin 3.
NOTE: Error 13 indicates an excessive temperature condition on theRegulator board, possible caused by a short regulator or B+ switchingtransistor (e.g. Q909 or Q904).
Output Amplifier DC detection Circuit (Error 21)
44
5. System Control System
FIGURE 5-4 - OUTPUT AMPLIFIER B+ DETECTION CIRCUIT A126.5-4 6/7/04
SBR+
FROMDIGITAL AMP
IC1537
B+
FROMDIGITAL AMP
IC1537
R1889
D18033.6V R1803
TO SUB-MICROIC1800/PIN 16
D-AMP BOARD
2.5V
Q1677
Q1657
The circuit shown in Figure 5-3 monitors for the presence of a positive ornegative 3V DC difference level across the speaker output for the Left-Channel. There is an identical protection circuit for all channels. Theseare listed in Table 5-3.
The transistors Q1751 and Q1761 are configured so that a positive ornegative DC difference level can be detected between the L+ and L-outputs.
For example, if a positive DC level is detected at the L+ output in referenceto L-, Q1761 will turn ON and apply a high through D1316 to IC1800/pin32. If a negative DC level is detected at the L- output in reference to L+,Q1751 will turn ON and apply a high through D1316 to IC1800/pin 32.This same circuit description applies for all other outputs listed in Table 5-2.
Note: An Error 21 indicates most likely a failure of a MOSFET outputtransistor.
To determine which output channel has the defective MOSFET, placea VOM across each speaker output individually, and power the unitON. A DC level (~3V) at any output before unit goes into protectionindicates a defective channel (Check the MOSFET outputs for thatchannel).
Output Amplifier B+ Detection Circuit (Error 22)
45
5. System Control SystemAs shown in Figure 5-4, B+ (33V to 68V) is applied to the Sub-Micro IC1800/pin 16 through R1889, which is used to drop B+ to approximately 2.5V(this circuit is located near the SBR speaker output circuit). This circuitdetects the presence of output stage B+ supply. If the supply is missing,IC1800/pin 16 will go low and error 22 will be displayed. The 3.6V zenerdiode D1803 protects against the line going above 3.6V.
NOTE: An Error 22 indicates a missing B+ not a defective outputstage. If this error occurs the Switching Regulator is defective, orOpen Circuit in the B+ path has occurred, and B+ is not supplied tothe output stage.
46
6. System Control
Chapter 6 - System ControlOverall Block
FIGURE 6-1 - SYSTEM CONTROL OVERALL BLOCK
IC2201DSP
IC2251DSP
IC3601COMBFILTER
IC3241
IC3431
IC702
IC701
IC3651
IC3501
IC3751
IC3661
TUNER
IC3701CHROMADECODER
IC1800SUB SYSTEMCONTROL #2
TO SWITCHREGULATOR BRD.(VOLUME CONTROL)
CONTROL
OVER CURRENTPROTECTOVER VOLTAGEPROTECT
HEADPHONE RELAY
SPEAKER A/B RELAY
POWERRELAY
S-MUTE
IC2005SWITCHER
IC401SWITCHER
IC341SWITCHER
DIGITAL
2CH
MULTI-CH
IC1401PCM/PWM
IC1402PCM/PWM
IC1403PCM/PWM
IC1404PCM/PWM
CONTROL
HEADPHONEDETECT
FL BRD.
IC2962
IC2912
IC2862
IC2812
IC326
IRFRONT
IC2601MAIN SYSTEM
CONTROL
IRREAR
IC2701SUB SYSTEMCONTROL #1 IR RX
CONTROL
IC2706SYSTEMRESET
IC2121I/F RECEIVER
CONTROLRS232INPUT
IR RX
A126.6-1 6/7/04
CONTROLCONTROL CONTROL
CONTROL
CONTROL
15 16
X27017.28 MHZ
X260116.5 MHZ
VOLUME BRD.
KEY BRD.
POWERSWITCH
JOG BRD.
FUNCTION BRD.
22 23
X18008 MHZ
VIDEOSWITCHING ICs ELECTRICAL
VOLUME ICs
5857
SWITCHINGREGULATOR
IC1005INVERTER
LED DRIVEQ1004, Q1003
D1020D1021D1022
TEMPERATUREPROTECT
IR TX
CONTROL
CONTROL
CONTROL
CONTROL
47
6. System ControlThe main item to note about the Overall System Control Block is whatcircuits are controlled by each system control. This will be very helpfulwhen determining if one of the system controls is defective.
Key Control Functions of System Control ICs:
• Main Micro:o All Key-Scan functionso Switching Regulator Control
§ Power Change Signal§ Stop Signal
o Audio & Video Switching ICso Audio & Video Processing ICso IR Receiver Processing
• Sub-Micro #1:o System Reset Generationo RS232 Interfaceo IR Transmitter Processing
• Sub-Micro #2:o All PCM/PWM Processing Controlo Switching Regulator Control
§ Power Switch Signalo All Protection Circuits Interfaceo Headphone Relay Controlo A/B Speaker Relay Control
TroubleshootingIC2601 (Main Micro) and IC2701 (Sub-Micro #1)If either of these microprocessors should fail, the unit will not power-up(no display and no functions) when the ON/OFF button is pressed. Todetermine which component is at fault, perform the following checks:
1) Apply AC Power.2) Press ON/OFF button: No Reaction.3) Check Switching Regulator Standby Power Supply 12V at CN8/
pin 3 (Reference Fig. A-5, Appendix A).a. If missing, troubleshoot Switching Regulator (Ref. Chapter
2).b. If the Standby 12V at CN8/pin 3 is Pulsing as shown in
Waveform 6-1:i. Check voltage at CN8/pin 8 and CN8/pin 6, if also
Pulsing as shown in Waveform 6-2 & 6-3, thenIC2601, the Main Micro, is defective (first confirmCrystal and Supply Voltage before replacement).
c. If Standby 12V is present and stable, go to step 44) Check REG board Standby Output Voltages at CN909/pin 7 (+5VB)
and CN909/pin 8 (+3.3VB).a. If missing, troubleshoot IC912 and IC911 regulators on REG
board (Ref. Chapter 2).b. If +5V and +3.3V are present and the unit still does not
power-up, then IC2701 Sub-Micro #1 is defective (firstconfirm Crystal and Supply Voltage before replacement).
48
6. System ControlIC1800 Sub-Micro #2If IC1800 (Located on D-Amp board) fails, the unit will still power-up, butno speaker audio is present. Perform the following checks to determine ifeither IC1800 is defective or there is a defect along the audio path:
1) Check Pre-Out audio outputs.a. If audio is present at Pre-Out and the is no audio present at
ALL speaker channel outputs, then this confirms there is adefect on the D-Amp board and also IC1800 is possiblydefective. Go to Step 2.
b. If audio is not present at random Pre-Out & SpeakerOutputs, then there is a defect along the audio path.Reference Chapter 3 for Audio troubleshooting.
2) Check any of the following functions to confirm a defective IC1800.These functions are all performed by IC1800 (first confirm Crystaland Supply Voltage before replacement):
a. Speaker A to B relay switching with Speaker Switch.b. Headphone Relay switching (plug in headphones).c. Temperature Protection circuits.
WAVEFORM 6-1
3Vpp
2V/div100 ms/div
WAVEFORM 6-2
0.9Vpp
1V/div100 ms/div
WAVEFORM 6-3
0.2Vpp
0.1V/div100 ms/div
i
Appendix A
Appendix A
S-VideoBooard
CISBoard
VideoBoard
Audio Board Analog SubBoard
(on AudioBrd)
D-Amp Board
REG Board
SwitchingRegulator
DigitalBoard
Pre-OutBoard
UnderneathAudio Board
FIGURE A-1 - OVERALL BOARD LOCATION
Front Panel
FL Board
JogBoard
HPBoard
PowerSW
& PowerBoards
LEDBoard
VOL Board
FunctionBoard
FIGURE A-2 - FRONT PANEL BOARD LOCATION
ii
Appendix A
Video Board
Audio Board
Analog SubBoard
CNP622 CNP621 CNP620
CNP602CNP601
FIGURE A-3 - ANALOG SUB BOARD CONNECTORS
REG Board
CN909CN913
CN914
FIGURE A-4 - REG BOARD CONNECTOR LOCATION
iii
Appendix A
SwitchingRegulator
Board
CN1
CN2
CN3
CN8
CN4 CN7
CN5
CN6
FIGURE A--5 - SWITCHING REG CONNECTORS
and ES® are trademarks of Sony Electronics
©2004 Sony Electronics Inc.EMCS - A Service Company
1 Sony DrivePark Ridge, New Jersey 07656
Reproduction in whole or part without written permission is prohibited. All rights reservedA1260604 6/21/04