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PRIMARE
A32 Power Amplifier Service Manual
1. Technical Description.
2. Error codes.
3. Bias Adjustment.
4. Schematics.
5. Technical Specifications.
Confidential ! This document is not allowed to show for third part without written permission from Primare Systems AB. This document is subject to change without notice. Author: Bjorn Holmqvist Primare Systems AB bjorn@primare.net
A32 Functional Description Features The Primare A32 power amplifier is a fully balanced design, this means that the negative speaker terminals are active, not ground as on an unbalanced design. When performing measurements, test equipment (such as Audio Precision) that can handle balanced amplifiers must be used. The input impedance is 15K and the gain is 26dB. It is possible to obtain just above 250 undistorted watts at an 8R load (both channels driven). The frequency response are flat, the A32 will drop down only -2dB at 100Khz. Standby The A32 is equipped with two standby modes, where standby mode 2 is the power save mode. In power save mode only the standby circuit will be powered by the small standby transformer placed on the digital PCB. Digital control and monitoring When power is first applied and the standby button on the front panel are pressed down the A32 are going to initiate the startup sequence. Relay K1 will be turned on where after a small delay will follow before relay K2 goes active to disable the inrush limiters. At the same time bias are turned on by shutting down the voltage supplied to the optocouplers on the amplifier channels. After a 20 second startup delay for the amplifier to settle down the speaker relays are turned ON. During the startup sequence all safety parameters such as DC-offset and fuses will be monitored, if an error is spotted the amplifier will refuse to start and the standby LED will flash rapidly to indicate that an error has occurred. The error code can be read out by pressing the error check switch (SW1). Description of the error codes can be found on the next page. If the standby switch is pressed when the amplifier is in operate mode it will go to standby mode 1, which means that bias and speaker relay will be switched off. The standby LED is going to half light intensity to indicate that the amplifier is in this standby mode. If the standby button are pressed down for more than one second the amplifier are shutting down into standby mode 2 which means that bias, speaker relay and the two power relays K1, K2 are switched off. Only the standby circuit is still powered consuming just a few watt of energy. Temperature protection When temperature has reached 70 centigrade at the temperature sensors the speaker relay and bias are going to be switched off, when the temperature have decreased 10 centigrade the A32 are going to be restarted. In practice this will mean that the warmest part of the heatsink will be around 75-80 centigrade when over- temperature protection cuts in.
General Protection During operation mode DC-offset, fuse, temperature and AC-loss are constantly monitored, any abnormal function from these will immediately disengage the speaker relay and the standby LED will start to flash rapidly indicating that an error has been spotted. The error code can be checked by pressing the error check button (SW1), if more than one error at the same time a repeated press of the button will display the next error. DC-offset and over temperature will automatically resume to normal operation after a delay if the error recovers. Fuse error will not (latch), here the amplifier must be turned off and the fuses replaced before normal operation is possible. Trigger. If a 3.5mm teleplug are connected to the left trigger input (the right connector is the output) the function of the standby button are being changed to only be able to turn the amplifier into standby mode 2 directly. The standby button cannot turn the amplifier on while the trigger is connected (trigger mode enable). The circuit will trigger at 2.5V and are highly immune against disturbances. The trigger are only able to control the amplifier between operate and standby mode 1. RS232 The RS232 port can be used for firmware upgrading as well as controlling by Crestron compatible RS232 codes. Fuses Due to the large capacitance of the electrolytics bank, turn off the mainspower and wait minimum 15minutes before replacing a blown fuse. Make sure to replace a blown fuse with exactly the same type and value. Error codes LED Nr
3 2 1 Error 0 0 0 All OK 0 0 1 DC L+ 0 1 0 DC L- 0 1 1 DC R+ 1 0 0 DC R- 1 0 1 Fuse Rch 1 1 0 Fuse Lch 1 1 1 Overheated
Bias Adjustment Critical for the adjustment are that the mainsvoltage is 230V or 120V exactly. The temperature in the facility must be constant during the adjustment procedure.
Use the Bias test points and potentiometers (R1, R2) to adjust bias on each channel. The lower potentiometer is accessible thru a hole in the bottom of the amplifier.
Bias test points
Compare the voltage drop over all of the emitter resistors.
These steps describe the Bias adjustment procedure, which is the same for both L& R channels. 1. Switch the amplifier on or if it has been on burn-in (test), disconnect input signal and
loads. The A32 amplifier must be in operate mode, bias will be switched off in standby. 2. Let the amplifier run for 1h, without input signal. 3. Adjust the bias to 17mV measured on JP3, JP4 or JP2, JP1. 4. Check the maximum difference (voltage drop) over emitter resistors (R241, R243,
R245, R247, R239, R237, R235, R233, R240, R238, R236, R234, R242, R244, R246, R248). The difference between them should not exceed 7mV. Higher difference might be due to a faulty transistor or Emitter resistor, also check and that the screw are tightened.
5. Wait 1h. 6. Measure the bias and if needed readjust to 17mV measured on JP3, JP4 or JP2, JP1. 7. Wait 1h. 8. Measure the bias and if needed readjust to 17mV measured on JP3, JP4 or JP2, JP1. 9. Wait 1h. 10. Measure the bias and if needed readjust to 17mV measured on JP3, JP4 or JP2, JP1. Repeat step 5-9 until the bias are stabile.
1 2 3 4 5 6 7 8
A
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Title
Number RevisionSize
A3
Date: 14-Nov-2005 Sheet of File: C:\WORK\..\P2005-3D.SCH Drawn By:
C4
2200
U/2
5V
S1
T500mAD12
BRIDGE1
123456789
10
J1
CON10
Bias LSPK Relay LXLR/RCA L+15V L
Temp1 LTemp2 L
GND L
Fuse LDC-Check+ LDC-Check- L
123456789
10
J2
CON10
Bias RSPK Relay RXLR/RCA R+15V R
Temp1 RTemp2 R
GND R
Fuse RDC-Check+ RDC-Check- R
R50R
R60R
R7536R
R8560R
R9
2K2
R21510R
R2410R
R26
4K7
R332R2
R342R2
SW B
AL/
UN
BA
L
Q1
BCV46
R10
2K2
R25
2K2
C1+ 1
V+ 2
C1- 3
C2+ 4
C2- 5
V- 6
T2OUT 7
R2IN 8
R1IN13
R1OUT12
R2OUT9
VCC16
GND15
T1OUT14
T2IN10 T1IN11
U2
MAX3232ECAE
1234
P2
HEADER 4
123F1
NMF40
123 F2NMF40
C8
100N
C9
100N
C10100N
C11100N
C12100N
+3.3V
RS2
32
NO
11
N02
8
C1
2C
27
NC
13
NC
26
CO
IL4
CO
IL5
K1RELAY DPDT3
786
3
2
5
4
1
D1KB2855
R37NTC 7R
R38NTC 7R
R39NTC 7R
NO
11
N02
8
C1
2C
27
NC
13
NC
26
CO
IL4
CO
IL5
K2RELAY DPDT3
240V
120V
Q2 BCV46
R11
470R
Q4 BCV46
R12 470R
D2BDY17D
D3BDY17D
P2.0/ICB/DAC0/ADC031
P2.1/OCD/AD022
P0.0/CMP2/KBI0/AD013
P1.7/OCC/AD004
P1.6/OCB5
P1.5/RST6
VSS7
P3.1/XTAL18
P1.0/TXD 18
P0.5/CMPREF/KBI5 22
VDD 21
P0.1/CIN2B/KBI1/AD10 26
P0.3/CIN1B/KBI3/AD12 24
P0.6/CMP1/KBI6 20
P0.2/CIN2A/KBI2/AD11 25
P1.1/RXD 17
P3.0/XTAL2/CLKOUT9
P1.4/INT110
P1.3/INT0/SDA11
P1.2/T0/SCL12
P2.5/SPICLK 16
P0.4/CIN1A/KBI4/AD13 23
P2.2/MOSI13
P2.3/MISO14
P2.7/ICA 28
P0.7/T1/KBI7 19
P2.4/SS 15
P2.6/OCA 27
U3
P89LPC935
R13
10K
R14
10K
R15
10K
R16
10K
R27
10K
R28
10K
C13
100U/6.3V
C14
100U/6.3V
C15
100U/6.3V
C16
100U/6.3V
+3.3VD
X2
4MHZ
C1710p
C1822p
SER14
SRCLK11
SRCLR10
RCLK12
E13
O0 15
O1 1
O2 2
O3 3
O4 4
O5 5
O6 6
O7 7
Q7 9
VCC16
GND8
U5
74LVC595
+3.3VD
R29
3K3
R30
3K3
R31
3K3
D9LED
D10LED
D11LED
R40 412R
R41 110R
+3.3VD
C22100N
D4LL4148
D5LL4148
R32
4K7Q5BC846
4
2
3
1SW1
SW-B3
R18
10K
+3.3VD
Check error
+3.3V
D6LL4148
D7LL4148
C23
100N
12345678910
J3CON10
12345678910
J4CON10
S2NC
123
S3SW-SPDT
+3.3VStandby mode
R19
4K7
+3.3V
+3.3VD
+3.3VD
R42
470KC24
330N
D8
LL4148
+3.3VD
1234
P5 HEADER 4
SW2
R20
1K
PIN4 ON P5
PIN3 ON P5
PIN2 ON P5PIN1 ON P5
PCB 2
PCB3 PCB4
P6
PLUG
P7
PLUG
C147nF/275V X2
C2
47nF/275V X2
P1
PLUG
P3
PLUG
P4
PLUG
P8
PLUG
P9
PLUG
P10
PLUG
1
8
15
13
9
11
4
5
T1
TRANSF53X44
16
2
3
5
4SW3
SW120-240
240V
To mains Transformer
C19100N
C20100N
C2510N
R4310R
C26100U/25V
J5
PHONEJACK STEREO SW
J6PHONEJACK STEREO SW
C27100N
R4410R
C28
47u/16V
R12K2
R2NC
R3NC
Q6BC846
Q7BC846
R4
4K7
R22
4K7+3.3VD
R23
10K
R45
10K
R46
10KQ3
BCV46
R47
10K
C29100U/6.3V
C30100U/6.3V
Vin3
AD
J1
Vout 2
U4LD1085V33
C31100nC32
100n
C33
100U/6.3V
+3.3VD
+3.3VD
D13
LL4148D14
LL4148D15
LL4148
D16
LL4148
D17
LL4148
D18
LL4148
D19
LL4148
D20
LL4148
D21LL4148 D22
LL41
48
D23
LL41
48
D24
LL4148
1 2 3 4 5 6 7 8
A
B
C
D
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B
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Title
Number RevisionSize
A2
Date: 7-Dec-2005 Sheet of File: C:\WORK\..\P2005-8C.SCH Drawn By:
Q12SC2240
Q92SA970
Q13BD677A
Q152SC5171
Q662SA1930
R11K
Q69
2SA1943
Q77
2SC5200
R333K
R710K
R11110R
R13
470R
D1
1N41
48
D2
1N41
48
C10.1U
R31
5K6
R32
5K6
R355K6
R403K3
Q10
2SA970
R4215K
R4312K
C1422PF
Q22SC2240
Q32SC2240
Q42SC2240
R46133R
R481K5
R14
470R
R207
1K
R209
22K
C84
39P
D3
1N4148
D41N4148
C2
0.1U
R15
470R
R213220R
R217100R
R16
470R
R221
4K7
R222
4K7
R223
4K7
R229470K
A1
K2
C 4
E 3
Q85
OPTOISO1
1
2
3
Q87BS107
R214
330R
R231680R
R2242K2
R491K1
Q172SC5171
R1756R
R1856R
C40.1U
C86
220U/16V
R19220R
R20220R
R2330.22R
R2340.22R
R249
22R
R250
22R
R251
22R
R252
22R Q70
2SA1943
Q78
2SC5200
R2350.22R
R2360.22R
R253
22R
R254
22R
R255
22R
R25622R
S1
6.3A
S2
6.3A
C88100N
C89100N
R210
22K
R2831K
C50.1U
C901U
R296
1M
+15V
-15V
C60.1U
C940.1U
C96100U/63V
C97100U/63V
R2984R7
C70.1U
R21
470RBIAS
Q89A2SK389
Q89B2SK389
+50V
-50V
U1
TL071
R284
1K1C110NC
12
JP3
C98
100U
/63V
C99100U/63V
Q71
2SA1943
Q79
2SC5200
R2370.22R
R2380.22R
R257
22R
R258
22R
R259
22R
R260
22R
Q72
2SA1943
Q80
2SC5200
R2390.22R
R2400.22R
R261
22R
R262
22R
R263
22R
R26422R
R285
1K
R30015K
R218
100R
R286
1K
R219
100R
R287
1K
R301
22K
R30222K
C112330P
C113330P
C114330P
3
21
84
U9AOPA2134
5
67
U9BOPA2134
3
21
84
U10AOPA2134
5
67
U10B
OPA2134
S4A
SW SPDT
S4B
SW SPDT
45
S4C
R288
1K
R289
1K
R290
1K
R291
1K
R30347K
R30447K
R265
22R
R266
22R
Q52SC2240
Q112SA970
Q14BD677A
Q182SC5171
Q672SA1930
1
W
2R21K
Q73
2SA1943
Q81
2SC5200
R433K
R810K
R12110R
R22
470R
D17
1N41
48
D18
1N41
48
C80.1U
R37
5K6
R38
5K6
R395K6
R413K3
Q12
2SA970
R4415K
R4512K
C15 22P
Q62SC2240
Q72SC2240
Q82SC2240
R47133R
R501K5
R23
470R
R208
1K
R211
22K
C85
39P
D19
1N4148
D201N4148
C9
0.1U
R24
470R
R215220R
R220100R
R25
470R
R225
4K7
R226
4K7
R227
4K7
R230470K
A1
K2
C 4
E 3
Q86
OPTOISO1
1
2
3
Q88BS107
R216
330R
R232680R
R2282K2
R511K1
Q642SC5171
R2656R
R2756R
C100.1U
C87
220U/16V
R28220R
R29220R
R2410.22R
R2420.22R
R267
22R
R268
22R
R269
22R
R270
22R Q74
2SA1943
Q82
2SC5200
R2430.22R
R2440.22R
R271
22R
R272
22R
R273
22R
R27422R
C91100N
C92100N
R212
22K
R2921K
C110.1U
C931U
R297
1M
+15V
-15V
C120.1U
C950.1U
C100100U/63V
C101100U/63V
R2994R7
C130.1U
R30
470RBIAS
Q90A2SK389
Q90B2SK389
+50V
-50V
3
26
74
U8
TL071
R293
1K1C111NC
C102
100U
/63V
C103100U/63V
Q75
2SA1943
Q83
2SC5200
R2450.22R
R2460.22R
R275
22R
R276
22R
R277
22R
R278
22R
Q76
2SA1943
Q84
2SC5200
R2470.22R
R2480.22R
R279
22R
R280
22R
R281
22R
R28222R
C3
2200
U/5
0V
C17
2200
U/5
0V
C18
2200
U/5
0VC
1922
00U
/50V
C11
910
0NC
120
100N
R306
10R
R307
10R
C127
220U/35V
C128
220U/35V
+15V
-15V
Vin1
GN
D2
OUT 3
U117815
Vin2
GN
D1
OUT 3
U127915
Q65 2SC4793
Q682SA1837
R522K2
R2062K2
C129470U/35V
C130470U/35V
D2324V
D2424V
C13110U/50V
C13210U/50V
+50V-POWER
-50V-POWER
+50V-POWER
-50V-POWER
+50V-POWER +50V
-50V-50V-POWER
C121
100N
+15V
+15V
-15V
-15V
-15V
+15V
C122100N
C123100N
C124100N
C125100N
C126100N
C133220U/50V
C134220U/50V
12
JP4
C106
100U/63V
C107
100U/63V
C108
100U/63V
C109
100U/63V
123456789
10
J6
CON10
BIASSPK-RELAY
FUSE-ERROR
R520K
R620K
FUSE-ERROR
DC-CHECK +
DC-CHECK -
DC-CHECK -DC-CHECK +
Q91BC846
D21
1N4007
R309560R/3W
12
3
4 5
S8
RELAY-SPDT
R310100K
R2944K7
SPK-RELAYQ92BC846
D221N4148
R311100K
R295
4K7XLR/RCA
+15VR312
100R
XLR/RCA
R9
10K
R10
10K
C16
NC
C83
NC
+15V
C20
2200
U/5
0V
C21
2200
U/5
0V
C22
2200
U/5
0V
C23
2200
U/5
0V
C24
2200
U/5
0V
C25
2200
U/5
0V
C261U/250V
C271U/250V
C28
100N
C29
100N
C30100n
C31100n
C32100n
C33100n
RV1KTY81
OUT(+)
OUT(-)
C34100N
C35100N
C3610N
R3310R
R340R
R360R
R53
100R
R54
100R
R55
100R
GNDXLR+
XLR-
RCA INRCA-GND
C37
100U/50V
R56
1KR57
1K
R581K
R591K
12
JP1
12
JP2
R6010R
R6110R
R6210R
R6310R
1 2 3 4
A
B
C
D
4321
D
C
B
A Title
Number RevisionSize
A4
Date: 7-Dec-2005 Sheet of File: C:\WORK\..\P2005-4B.SCH Drawn By:
D1
BRIDGE1
C115000/63V
C215000/63V
C315000/63V
C415000/63V
C515000/63V
C615000/63V
D2
BRIDGE1
D3
BRIDGE1
C715000/63V
C815000/63V
C915000/63V
C1015000/63V
C1115000/63V
C1215000/63V
D4
BRIDGE1
P1
PLUG
P2
PLUG
P3
PLUG
P4
PLUGP5
PLUG
P6
PLUG
P7
PLUG
P8
PLUG
P9
PLUG
P10
PLUG
P11
PLUG
P12
PLUG
P13
PLUG
P14
PLUG
R1MRS25
R2MRS25
R322k
R422k
Performance Data 2000VA Torodial Transformer. A total of 180 000 uF electrolytes in the powersupply. Dual set of Speakerterminals for each channel. Balanced (RCA) and Unbalanced (XLR) inputs. Input impedance 15K, RCA and XLR Output Power (both channel driven): 2x250W 8Ohms load 20Hz-20Khz 2x400W 4Ohms load 20Hz-20Khz THD+N below 0.05% in both cases. Frequency response: 20Hz-100Khz –0.5dB Noise, below –100dBV THD+N: 1K 250W 8R load below 0.01%. Gain: 26dB unbalanced, 20dB balanced. Trigger input range: 4-15V.
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