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A65/75
Service Manual
Issue 1.0
DiVA A65, A75 & P75 Plus
Amplifi ers
A ARCAM RCAM
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Contents List ! Contents list ! Circuit description ! Service guide ! Circuit diagrams ! Component overlays ! Circuit board parts list ! General assembly parts list
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The input pair (Q606,607,618,619,706,707,718,719) are in a A65/75/75P Plus Circuit Description Darlington configuration to lower input current offset which in turn will lower DC offset at the output, as the impedances seen on the input nodes are necessarily high for the wide bandwidth required. PSU The output stage is a simple bipolar darlington (Q614,615,714,715). In order get the output devices to turn fully on and achieve the However, the devices used are Darlington devices with in
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A65, A75 & P75 Service Guide Fault diagnostics Fault Action No power Check mains fuse Check transformer connections Check power supply rails Stuck in protection Check power supply rails Check protection circuit voltages Check for dry joints on o/p devices Intermittent audio on one channel Check for dry joints around o/p devices Fails to respond to commands Check supply to remote circuit Check IC Z900 Check remote flex foil cable Check for dry joints on selector pcb Volume cont
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LEFT CHANNEL L942C5_1.0.SCH PROTECTION SP2_SEND_L SP2_RETN_L A1 A1 PWRLEFT OP_L PHONO & INPUTS L942C3_1.0.SCH TONE CONTROL L942C4_1.0.SCH SELOPL SELOPL SELOPR SELOPR PWRLEFT ACSENSE HPSW2 HPSW2 PWRRIGHT TAPECONTROL TAPOL PROT_OP_L TAPOL TAPOR PROT_OP_R TAPOR SP2_SEND_L PROTECTION MUTE SP2_RETN_L HPSW1 HPSW1 OP_L RIGHT CHANNEL OP_R L942C6_1.0.SCH SP2_SEND_R SP2_RETN_R PWRRIGHT PREMUTE AVCONTROL A1 SP2_SEND_R A1 SP2_RETN_R REMOTE CONTROL L942C7_1.0.SCH AVCONTROL OP_R MUTE ACLT1 MUX1 MUX2 MUX3 PROT
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+38V_L +37V + + C600 C603 C614 C613 100U EL 100V 100U 50V YXF LOW Z 100N PE 100V R601 R602 R615 100N PE 100V 100R MF 100R MF 47R MF 0V_HF 0V_HF D601 0V_HF ZENER 400MW 27V Q601 Q600 Q602 BC556B BC556B BC556B C609 R621 22N CD 680R MF Q605 SPLS600 BC556B SP2_RETN_L Bot+ R629 PROTECTION SK600B 47K MF R622 D603 C620 10K MF 1N4003F 470P CD SPKSKT_G Q604 Q603 2SA970GR 2SA970GR Bot- R625 A1 C608 6K8 MF C604 100P PPW D605 R634 100P PPW 1N4148 SK600C 470K MF 0V_LS_L Q614 CHASS SAP15N Bias-L + R627
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D907 MOTSUP900 + 1N4003F C918 C920 1M0 25V 100N CD Z905 0V_DIG 0V_DIG BA6109 3 CC1 VOLM901 2 MD1 +5v 5 MC1 VOLMOT900 C913 10N CD 1Y271 SK900 R905 4 1 FFC10V REF GND 33K MF C912 Q900 0V_DIG R901 BC556B 6 10N CD MC2 12K MF VOLM900 Disp H Disp F Disp D + 10 Disp B Z907A MD2 9 0V_DIG 74HC4051 +5v C901 CC2 Disp A R915 100U EL 13 3 Disp I Disp GDisp EDisp C X0 X 14 220R MF X1 R900 15 ACLT1 MOTOR DRIVER VOLUME DRIVE X2 0V_DIG 12 1R0 FU X3 +5v 1 D906 X4 5 C900 1N4003F X5 2 X6 10N CD 4 TAPECONTROL X7 MOT
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+ + + +15V LK101 10MM LINK Z100A + C145 LED100 NE5532 C101 10U EL G LK100 C131 100N CD 3 LK100A L856CA +37V D134 C124 1 R146 1 1 Z100C 0V_SIG 2 2 2 2K7 1W CF 47P CD 22U EL NE5532 5V6 400MW 3 3 R147 0V_SIG + C146 2K7 1W CF 10U EL C102 0V_HF R110 R112 D129 3WAY CABLE HOLDER 100N CD R 680K MF 56K MF LED RED/GRN 3MM R114 R116 1N4003F D131 C127 C129 -15V R108 8K2 MF 18K MF 5V6 400MW 470R MF 4N7 PP 1N3 PP +15v D101 D103 C125 22U EL 1N4148 1N4148 SK100A -15v +37V 1 PHINL R117 F 0V_SIG AUXOL ACSENSE PRO
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+ R311 10R FU C304 Q300 Q304 D300 R301 BC546B BC546B 4K7 MF 1N4003F 47U EL 100V +38V_R +38V_L C310 + + C312 100U EL 100V D301 C317 D304 C319 1N4003F +37V_L 100N CD ZENER 500MW 39V 220U EL 50V +38V_R 100N CD ACLT1 AC MAINS INPUT SK303 0V_PSU 0V_HF C311 C320 SK300 1 + 100U EL 100V Grey D302 + C313 C318 -37V_R -37V_L D305 100N CD IEC3 2 C305 1N4003F 100N CD Grey ZENER 500MW 39V 47U EL 100V 220U EL 50V Q302 -38V_R -38V_L D303 CAGECLAMP2 Q305 R302 0V_DIG BC556B N E L BC556B 4K7 MF TX300 R312 1N4003F
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+38V_R +37V + + C700 C706 C714 C713 100U EL 100V 100U 50V YXF LOW Z 100N PE 100V R701 R702 R715 100N PE 100V 100R MF 100R MF 47R MF 0V_HF 0V_HF D701 0V_HF ZENER 400MW 27V Q701 BC556B Q700 Q702 BC556B BC556B SPLS700 SP2_RETN_R Bot+ C720 SK700B 470P CD D703 Q703 SPKSKT_G 2SA970GR 1N4003F Q704 2SA970GR Bot- R725 A1 C708 6K8 MF C704 100P PPW D705 R721 100P PPW 1N4148 SK700C 470K MF 0V_LS_R Q714 SAP15N CHASS Bias-R + R727 Q712 SPKSKT_G 2SC2240GR 430R MF C723 SPLD700 R705 100N PE 100V SET BIAS T
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+ + Case C197 10P CD R212 68K MF BASS Z160A R204 R200 R210 R202 RV166A 2 C200 SW163A 4K7 MF SELOPL 4K7 MF 10K LIN POT 1 2PCO 24K MF 10K MF 3 47U EL 35V RV167A C204 C206 4560D 10K LIN POT 220N PE 220N PE SW162A PROT_OP_L 0V_SIG 2PCO Z161A R205 4 LK170 LK171 Tone controls : 3 C202 HPSW1 R161 4K7 MF 5 1 1 8dB cut and boost 1 L HPSW2 SP2_SEND_L 2 2 330R 1W CF 2 SP2_RETN_L 2 3 3 10U EL LHC R232 3 4 4 RHC SP2_RETN_R 4560D R162 100K MF 1 5 5 C208 SP2_SEND_R 6 6 330R 1W CF 4N7 PP 0V_SIG SK162 OP_L 6 7 7
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LEFT CHANNEL L940C5_1.0.SCH PROTECTION SP2_SEND_L SP2_RETN_L A1 A1 PWRLEFT OP_L PHONO & INPUTS L940C3_1.0.SCH TONE CONTROL L940C4_1.0.SCH SELOPL SELOPL SELOPR SELOPR PWRLEFT ACSENSE HPSW2 HPSW2 PWRRIGHT TAPECONTROL TAPOL PROT_OP_L TAPOL TAPOR PROT_OP_R TAPOR SP2_SEND_L PROTECTION MUTE SP2_RETN_L HPSW1 HPSW1 OP_L RIGHT CHANNEL OP_R L940C6_1.0.SCH SP2_SEND_R SP2_RETN_R PWRRIGHT PREMUTE AVCONTROL A1 SP2_SEND_R A1 SP2_RETN_R REMOTE CONTROL L940C7_1.0.SCH OP_R AVCONTROL MUTE ACLT1 MUX1 MUX2 MUX3 PROT
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+38V_L +37V + C600 C614 + C613 C606 100U EL 100V R601 R602 R615 100N PE 100V 100N PE 100V 100U 50V YXF LOW Z 100R MF 100R MF 47R MF 0V_HF D601 0V_HF ZENER 400MW 27V 0V_HF Q601 Q600 BC556B Q602 BC556B BC556B C609 R621 22N CD 680R MF Q605 SPLS600 BC556B SP2_RETN_L Bot+ R629 PROTECTION SK600B 47K MF R622 D603 C620 10K MF 1N4003F 470P CD SPKSKT_G Q604 Q603 2SA970GR 2SA970GR Bot- R625 A1 C608 6K8 MF C604 100P PPW D605 R634 100P PPW 1N4148 SK600C 470K MF 0V_LS_L Q614 CHASS SAP15N Bias-L + R627
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D907 MOTSUP900 + 1N4003F C920 C918 1M0 25V 100N CD Z905 0V_DIG 0V_DIG BA6109 3 CC1 VOLM901 2 MD1 +5v 5 MC1 VOLMOT900 C913 10N CD 1Y271 SK900 R905 4 1 FFC10V REF GND 33K MF C912 Q900 0V_DIG R901 6 BC556B 10N CD MC2 12K MF VOLM900 Disp H Disp F Disp D + 10 Disp B Z907A MD2 9 0V_DIG 74HC4051 +5v CC2 Disp A R915 C901 13 3 100U EL Disp I Disp GDisp EDisp C X0 X 14 220R MF X1 R900 15 ACLT1 MOTOR DRIVERVOLUME DRIVE X2 0V_DIG 12 1R0 FU X3 +5v 1 D906 X4 5 C900 1N4003F X5 2 X6 10N CD 4 TAPECONTROL X7 MOTE
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+ + + +15V LK101 10MM LINK LED100 + C145 G LK100 Z100A C101 LK100A L856CA D134 +37V 10U EL NE5532 R146 C131 100N CD 3 1 1 SW100D C124 1 2 2 2K7 1W CF Z100C 5V6 400MW 4PCO 0V_SIG 2 3 3 R147 47P CD 22U EL NE5532 2K7 1W CF 0V_SIG + 0V_HF C146 3WAY CABLE HOLDER R 10U EL C102 R110 R112 SW100B 100N CD LED RED/GRN 3MM 4PCO D129 680K MF 56K MF D131 R114 R116 5V6 400MW 1N4003F C127 C129 -15V 8K2 MF 18K MF R108 470R MF 4N7 PP 1N3 PP +15v D101 D103 C125 22U EL +37V 1N4148 1N4148 SK100A -15v 1 ACSENSE PROTE
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+ R311 10R FU C304 Q300 D300 Q304 R301 BC546B BC546B 4K7 MF 1N4003F 47U EL 100V +38V_R +38V_L C310 + + C312 100U EL 100V D301 C317 D304 C319 1N4003F +37V_L 100N CD ZENER 500MW 39V 220U EL 50V +38V_R 100N CD ACLT1 AC MAINS INPUT SK303 0V_PSU 0V_HF C311 C320 SK300 1 + 100U EL 100V Grey D302 + C313 -37V_R -37V_L D305 C318 100N CD IEC3 2 C305 1N4003F Grey ZENER 500MW 39V 100N CD 47U EL 100V 220U EL 50V Q302 -38V_R -38V_L D303 CAGECLAMP2 Q305 R302 0V_DIG BC556B N E L BC556B 4K7 MF TX300 R312 1N4003F
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+38V_R +37V + + C700 C706 C714 C713 100U EL 100V 100U 50V YXF LOW Z R701 R702 R715 100N PE 100V 100N PE 100V 100R MF 100R MF 47R MF 0V_HF D701 0V_HF 0V_HF ZENER 400MW 27V Q701 Q700 BC556B Q702 BC556B BC556B SPLS700 SP2_RETN_R Bot+ C720 SK700B D703 470P CD 1N4003F SPKSKT_G Q704 Q703 2SA970GR 2SA970GR Bot- R725 A1 C708 6K8 MF C704 100P PPW D705 R721 100P PPW 1N4148 SK700C 470K MF 0V_LS_R Q714 CHASS SAP15N Bias-R + R727 Q712 SPKSKT_G 2SC2240GR 430R MF C723 SPLD700 R705 100N PE 100V C710 R720
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+ + Case C197 10P CD R212 68K MF BASS Z160A R200 R210 R202 RV166A R204 2 C200 SW163A SELOPL 4K7 MF 10K LIN POT 4K7 MF 1 2PCO 24K MF 10K MF 3 47U EL 35V C204 C206 4560D 220N PE 220N PE RV167A 10K LIN POT SW162A PROT_OP_L 0V_SIG 2PCO Z161A R205 4 LK170 LK171 Tone controls : 3 C202 HPSW1 R161 4K7 MF 5 1 1 8dB cut and boost 1 L HPSW2 SP2_SEND_L 2 2 330R 1W CF 2 SP2_RETN_L 2 3 3 10U EL LHC R232 3 4 4 RHC SP2_RETN_R 4560D R162 100K MF 1 5 5 C208 SP2_SEND_R 6 6 330R 1W CF 4N7 PP 0V_SIG SK162 OP_L 6 7 7
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1 2 3 4 5 6 7 8 D D SW1 ALPS_ENCODER 12NOTCH SK1 FFC10H C C R903 R904 220R MF 220R MF B B LED901 LED902 LED903 LED904 LED905 LED906 LED907 LED GREEN3.1 MMLED GREEN3.1MM LED GREEN3.1MM LED GREEN3.1MM LED GREEN3.1MM LED GREEN3.1MM LED GREEN3.1MM Phono CD Tuner VCR AV/DVD TAPE AV/FIXED GAIN PCB PCB L885PB_1 DRAWING TITLE A A DISPLAY PCB FOR A75 AMP N/A CL 31-08-00 PRODUCTION RELEASE 1 N/A ES 31-07-00 CORRECTED TO MATCH MAIN PCB C Circuit Diagram Notes: N/A ES 14-06-00 ADD FLEXFOIL CONNECTORS AND CH
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