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Service Manual
A85
Issue 2.0
DiVA A85, P85 & P85/3
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 digital pots Z108D and Z108A control the bass and treble Pre-amplifier circuit description respectively. This is done by moving the wiper connected to the frequency-sensitive impedance between the non-inverting and inverting terminals of Z112A, effectively changing the ratio of The A85 preamplifier is a high-performance, DC coupled design feedback boost and feed-forward attenuation of the circuit at the with microprocessor control of input select, two independent tape desired freque
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Star point SP100 is the ground ‘mecca’ for the entire amplifier Amplifier & PSU Circuit Description (comprising all three PCBs within the unit). All of the separately named grounds are joined explicitly at this point. Different named grounds are used to ensure that no two ‘different’ grounds share L882PB is the printed circuit board that provides the power supply copper, which could compromise the noise, distortion or crosstalk and output stage amplifiers for the A85 integrated and p
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SK201B is a 13VDC signal trigger output which is active whenever the amplifier is powered up. R218 and DZ207 / C223 The input to the amplifier is limited to ±5.4V via back-to-back provide a reference voltage which is buffered by TR200. TR201 zener diodes DZ302 and DZ303. This is to prevent the user from and R217 act as a current limit and prevent damage due to a short grossly overdriving the input to the amplifier and possibly causing circuit on the output of SK201B. The maximum current is
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both halves of the following stage receive an equal AC signal C313 locally couples the ‘high frequency’ and loudspeaker ground component at high frequency. returns together at the output to overcome the effects of track inductance back to the star point. C309 couples the ‘high TR310 and TR307 are the ‘pre-driver’ transistors, which act to frequency’ and signal grounds together at the input for the same buffer the outputs from the preceding stage and drive the reason. Darlington output pow
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SK103 connects to the micro controller and display PCB. The 14 pin connector is numbered as follows: No Name Type Description 1 +5V_D O/P 5 volt digital supply (for micro) 2 0V_D O/P Digital ground 3 +49V O/P Main power supply for VFD (via fusible resistor) 4 STANDBY I/P Mains relay control signal (HIGH = ON) 5 SPKR1 ON I/P Speaker 1 relay control signal (HIGH = ON) 6 SPKR2 ON I/P Speaker 2 relay control signal (HIGH = ON) 7 THERMPROT O/P Over temperature protect (HIGH = FA
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A85, P85, P85/3 Service Guide Build History ECO Date Description of Change Number 00_1089 02/10/00 A85 – Fascia position changed to prevent display buttons sticking 00_1129 01/11/00 A85, P85, P85/3 – Improved stability under heavy clipping of amplifier R345, R346, R445, R446 changed from 100R to 0R link C307, C308, C407, C408 changed from 47P to 100P capacitors 00_1138 27/11/00 A85, P85, P85/3 – C303, C304, C403 changed from 10uF to 100uf capacitors – this prevents protection circui
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Fault Diagnostics Fault Action No power Check fuses Check power supply rails Unit functions ok but no audio Check preamp fuses Check RL100A (volume control mute relay) Check +5V supply rail Check mute signal line Volume control locks up Check software version is 2.0 or higher DC offset Check equipment connected to amp for DC on the audio leads Check alterations as per ECO 01_1101 have been fitted Unit fails to respond to commands Check ribbon cable from display to main board Che
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1 2 3 4 5 6 7 8 L882C3 0V_SIG L882C3_3.2.SCH L SIG VIPROT_L 0V_TRIG 5 6 0V_HF_R INPUT VIPROT D 0V_SIG DCPROT_L D 0V_SIG DCPROT TP121 0V_LS_L LS L 0V_D 1 2 0V_LS_R 0V_LS OUTPUT L882C2 0V_HF_L 0V_HF +49V 0V_D L882C2_3.2.SCH 0V_HF_L 8 7 0V_LS_L VPOS -49V 0V_PSU +5V_D VNEG 0V_D +5V(D) SP100 +49V 0V_PSU 0V_PSU VPOS STAR_8 STANDBY -49V PWRON VNEG VIPROT_L THERMPROT VIPROT_L THPROT_uC VIPROT_R VIPROT VIPROT_R VIPROT_uC L882C4 0V_TRIG AC PRESENT 0V_TRIG AC_PRES L882C4_3.2.SCH DCPROT_L DCPROT DCPROT_L DC
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1 2 3 4 5 6 7 8 NEUTRAL SK204 TP203 4 8 3 7 HS200 2 6 TO220HS08REG D D TX200 1 5 1 0V 9VRMS IC201 +5V_D MOLEXPWR8 F202 7805 TP204 5 I O RLY200A Vin Vout +5V(D) 9V TP205 D200 D202 T750mA SM 1N4003F 1N4003F DPDT5V NF SK203 LIVE SW200B VR200 IEC3 NO RIVETS N E L C207 VOL SEL SLIDE VDR 115V C225 C226 EMC Shield F200 100N CD 100N CD TP202 + C228 3N3 MAINS C224 2 115V + 1000u 10V 0V 100N CD 3 6 C227 C205 SH200 AS2A 7 TP201 3N3 MAINS 3300u 25V EMCMAINS 9V C206 NEUTRAL SW200A RLY200B D201 D203 3N3 MAINS
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1 2 3 4 5 6 7 8 VPOS D D R319 100R SM R315 R316 R300 100R SM 100R SM PRE DRIVER 10K SM PNP CURRENT MIRROR TR310 TR300 TR301 FMMT497 FMMT597 FMMT597 R301 10K SM + R321 TR302 C300 DZ300 TR309 22R SM FMMT597 100U EL 15V 350MW SM FMMT497 TR321 FMMT597 OUTPUT STAGE V-I PROTECTION VI PROTECT R338 R329 R305 SIGNAL TO MICRO 150R SM 4K7 SM 10K SM D301 C307 TP307 R333 BAS16W SM 0V_HF TR318 R334 VIPROT SAP15N 22K SM 3K3 SM 100P SM DZ305 TR311 R306 + C305 TP305 R341 D303 4V7 350MW SM FMMT497 C317 TR312 TR31
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1 2 3 4 5 6 7 8 VPOS D D R419 100R SM R415 R416 R400 100R SM 100R SM PRE DRIVER 10K SM PNP CURRENT MIRROR TR410 TR400 TR401 FMMT497 FMMT597 FMMT597 R401 10K SM + R421 TR402 C400 DZ400 TR409 22R SM FMMT597 100U EL 15V 350MW SM FMMT497 TR421 FMMT597 OUTPUT STAGE V-I PROTECTION VI PROTECT R438 R429 R405 SIGNAL TO MICRO 150R SM 4K7 SM 10K SM D401 C407 TP407 R433 BAS16W SM 0V_HF TR418 R434 VIPROT SAP15N 22K SM 3K3 SM 100P SM DZ405 TR411 R406 + C405 TP405 R441 D403 4V7 350MW SM FMMT497 C417 TR412 TR41
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1 2 3 4 5 6 7 8 DISP1 DISP SSV-07MS09 Q_26 R1 10K SM K4 Q_27 R210K SM D K3 (was POWER) D SW1 SW2 SW3 SW4 SW5 SW6 SW7 F1 F2 SKIP> > BAS16W SM D1 Q_1 BAS16W SM D2 SW8 Q_2 <
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1 2 3 4 D D C C Main signal path Power supply L937C2_1.1.SCH L937C3_1.1.SCH B B USE EXCLUDE NF WHEN USING RUNOUT SHEET PROGRAM DRAWING TITLE Integrated amplifier preamp PCB1 Circuit Diagram PCB A A 23425 Notes: 01_E014 JBR 28/11/01 Fuses uprated to 2A 1.1 A & R Cambridge Ltd. L937PB_1 Pembroke Avenue 01_1142 JBR 14/8/01 First production release 1.0 Denny Industrial Centre ECO No. INITIALS DATE DESCRIPTION OF CHANGE ISSUE Waterbeach Drawn by: Filename Date Printed Cambridge CB5 9PB Sheet 1 of 3 D
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1 2 3 4 5 6 7 8 D100 D105 +15V -15V +5V BAV99W DUAL SM BAV99W DUAL SM +15V +15V -15V D103 Z100 BAV99W DUAL SM Z109A AUX L 4 13 R110 X0 V+ TL072 SM SK2A +15V CD L 5 2K2 SM CDL1 CDL X1 SK4B R100 CD INPUT 1 CD L TUNER L 6 8 3 Z111A 0V_SIG X2 D R108 TAPEO1 AV L 7 1 TAPE OUTPUT Z112A TL072 SM 1K0 SM X3 Z111_3 R112 F C104 DVD L 12 R106 2 3 Z111_1 Z112B TL072 SM X4 47R SM Z112_3 R114 R103 C101 100N SM 11 1M0 SM F 1 3 TL072 SM 22K SM X5 Z112_1 100K SM 470P FKP2 VCR IN L 10 C108 2 1 5 C117 +5V 22K SM X6
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1 2 3 4 D302 D304 BAS16W SM BAS16W SM Z301 Q305 +15V LM317T +5V 2SA1964 I O Vin Vout +5V +15V3 D D Q306 SK300 BC846B D305 MOLEXPWR4 UR+ R303 D300 D301 BAS16W SM Q300 470R SM S1D S1D + J112 C300 +3.75V C304 1000u 35V 100N SM F300 AC1 R300 + R302 + C306 + 330R SM D310+ 1K2 SM C303 470U EL 25V C305 T2A SM 3300u 25V 10U EL C307 C308 D310 R307 470N PE 100N SM 15V 350MW SM 220R SM C314 + C302 1N0 PP 220U EL +15V SK301 + C312 C309 1 C315 220U EL 100N SM D311 F301 2 1N0 PP C AC2 C 15V 350MW SM 0V_PSU 3
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1 2 3 4 5 6 7 8 A85 DISPLAY PCB D D L865C2_2.0 L865C2_2.0.SCH UDB Update Box (Small) MICRO UPDATE_SML FD_1 FD_2 FIDUCIAL FIDUCIAL FIX7 FIX2 FIX10 FIX4 FIX5 FIX6 FIXING HOLE FIXING HOLE FIXING HOLE FIXING HOLE FIXING HOLE FIXING HOLE C C C39 CHASSIS 1 1N0 SM (BY SK3) C40 C41 C42 C43 C44 0V_D 1N0 SM 1N0 SM 1N0 SM 1N0 SM 1N0 SM 0V_D 0V_D 0V_D 0V_D 0V_D FIX1 FIX8 FIX9 FIX3 FIX11 FIXING HOLE FIXING HOLE FIXING HOLE FIXING HOLE FIXING HOLE C45 1N0 SM C46 C47 CHASSIS 2 C48 C49 1N0 SM 1N0 SM (BY SK1) 0V
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G R 1 2 3 4 5 6 7 8 +5V Q2 Q1 BC847B BC847B R1 R2 R3 R4 R5 R6 R7 R8 R68 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R25 R24 R23 R31 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 1K5 SM 1K5 SM 1K5 SM 1K5 SM 1K5 SM 1K5 SM 1K5 SM 1K5 SM 1K5 SM 1K5 SM SW6 TACTSW SM SW8 SW7 TACTSW SM TACTSW SM TACTSW SM A1506 TACTSW SM SW1 SW4 SW2 SW5 SW3 SW10 SW9 A1509 SW12 SW11 A1509 A1509 SW13 SW14 SW15 SW17 SW16 A1509 A1509 A1509
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1 2 3 4 5 6 7 8 D D C C LEFT CHANNEL L870C2_2.0.SCH +15V Q_1 Q_3 SK1 LEFT IN LEFT OUT PHONO2HG SK2 Q_5 1 1 2 3 4 0V_SIG 5 EMC Q_2 C1 RIGHT CHANNEL 6 100N CD L870C3_2.0.SCH 7 Q_4 Q_6 8 RIGHT IN RIGHT OUT 0V_SIG AMPCT8 Q_7 Q_8 -15V 0V_SIG 0V_HF B B DRAWING TITLE PCB1 EL1 A A A85 PHONO STAGE - TOP LEVEL PCB Update Box Circuit Diagram UPDATE_BOX L870PB_2 23425 Notes: 01_1070 JAG 17/4/01 updated pcb and scm 2 A & R Cambridge Ltd. Pembroke Avenue 00_1051 JAG 22/3/01 PRODUCTION ISSUE 1 Denny Industrial
