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Service Manual
A32
Issue 1.0
FMJ A32, P35 & P35/3
Amplifi ers
A ARCAM RCAM
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Contents List ! Phono board L870 o Circuit description o Component overlay o Parts list o Circuit diagrams ! Amplifier & PSU board L882 o Circuit description o Component overlay o Parts list o Circuit diagrams ! Display board L928 o Component overlay o Parts list o Circuit diagrams ! Preamplifier board L937 o Circuit description o Component overlay o Parts list o Circuit diagrams rd ! 3 Channel Amplifier board L911 o Component overlay o Parts list o Ci
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Phono Board L870 Contents ! Circuit description ! Component overlay ! Parts list ! Circuit diagrams
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AV8 Phono Board Circuit Description Refer to circuit diagram L870 sheet 1 The phono board is a simple single stage RIAA amplifier and consists of two channels of high gain amplification, and the ability to switch between moving magnet (MM) and moving coil (MC) settings. PSU The unit derives its + 15V regulated rails from the unit it is fitted into with only local decoupling capacitors on board. Interface The unit connects to the host unit via a 8 way connector. Amplif
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L870 Phono Board Parts List Issue 2.0 DesignatorPart Description C1 2A410 CERD 100N 63V -20% +80% RA C100 2N622 ELST 22U 63V C101 2D210 PPRO 1N0 5% 63V RA C102 2P710AS ELEC 100U 25V SILMIC C103 2P710AS ELEC 100U 25V SILMIC C104 2K410 PEST 100N 63V 10% C105 2K410 PEST 100N 63V 10% C106 2K410 PEST 100N 63V 10% C107 2K410 PEST 100N 63V 10% C108 2D147W PPRO W 470P 63V 5% RA C109 2D110W PPRO W 100P 63V 5% RA C110 2D247N PPRO 4N7 63V 5% RA C111 2D310 PPRO 10N 63V 1% AXIAL C112 2D310 PPRO 10N 63V 1% AX
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L870 Phono Board Parts List Issue 2.0 DesignatorPart Description R117 1H522 RES MF W4 1% 2M2 R118 1H022 RES MF W4 1% 22R R119 1H022 RES MF W4 1% 22R R120 1H022 RES MF W4 1% 22R R121 1H022 RES MF W4 1% 22R R122 1H339 RES MF W4 1% 39K R123 1H010 RES MF W4 1% 10R R124 1H256 RES MF W4 1% 5K6 R200 1H133 RES MF W4 1% 330R R201 1H110 RES MF W4 1% 100R R202 1H110 RES MF W4 1% 100R R204 1H110 RES MF W4 1% 100R R205 1H110 RES MF W4 1% 100R R206 1H110 RES MF W4 1% 100R R208 1H347 RES MF W4 1% 47K R209 1H31
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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
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1 2 3 4 5 6 7 8 +15V Q_102 + C102 C104 100U SILMIC 100N PE C119 0V_HF 0V_SIG D D R100 R101 R102 330R MF 100R MF 100R MF 100P PP C101 TR100 TR102 BC556B TR103 1N0 PP BC556B BC556B C110 TR101 BC556B + C100 4N7 PP 22U EL C120 1N0 PP R109 12K MF C112 TR108 TR109 BC546B BC546B 10N PP AX C111 R115 R110 15K MF 12K MF 10N PP AX R118 LEFT IN R112 22R MF D100 100K MF SW100B 1N4148 C106 C C 100N PE 4PCO C113 C105 C115 100N PE R116 LEFT OUT 1N3 PP 1U0 PE 2M2 MF R119 TR106 TR107 IC100 22R MF R122 2SA1085 2SA
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1 2 3 4 5 6 7 8 +15V Q_202 + C202 C204 100U SILMIC 100N PE C219 0V_HF 0V_SIG D D R200 R201 R202 330R MF 100R MF 100R MF 100P PP C201 TR200 TR202 BC556B TR203 1N0 PP BC556B BC556B C210 TR201 BC556B 4N7 PP + C200 22U EL C220 1N0 PP R209 12K MF C212 TR208 TR209 BC546B BC546B 10N PP AX C211 R215 R210 15K MF 12K MF 10N PP AX R218 RIGHT IN R212 22R MF D200 100K MF SW100A 1N4148 C206 C C 100N PE 4PCO C213 C205 C215 100N PE R216 RIGHT OUT 1N3 PP 1U0 PE 2M2 MF R219 TR206 TR207 IC200 22R MF R222 2SA1085 2
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Amplifier + PSU Board L882 Contents ! Circuit description ! Component overlay ! Parts list ! Circuit diagrams
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rails will vary with mains input and load conditions. The Amplifier & PSU Circuit Description current is around 20mA per relay. Refer to L882 circuit diagrams Star point SP100 is the ground ‘mecca’ for the entire This is the printed circuit board that provides the power amplifier (comprising all three PCBs within the unit). All supply and output stage amplifiers for the A32 integrated and of the separately named grounds are joined explicitly at P35 power amplifiers. this point. Differe
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The circuitry around SK201A and IC200 is to receive and the feedback resistors that sets the overall gain of the demodulate remote control commands sent in via the rear amplifier. panel jack socket. This is for multi-room applications. L200 and C200 form a parallel resonant circuit at approximately IC300B acts as an inverting integrator and its purpose is to 37kHz. The output from this bandpass filter is passed into remove DC from the loudspeaker output. Any positive DC IC200A where it is
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C307 and C308 with R333 and R335 provide the compensation necessary to ensure stability when the loop is R308, R314 and C320 form a low pass filter from which closed. They are Miller capacitors which dramatically reduce the DC detection circuits can sense excessive DC at the the transimpedance (i.e. current to voltage gain) of the current loudspeaker outputs. If there is any positive DC present, mirrors at high frequencies. The present value of 47pF then TR316 will turn on, which turns on T
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L882 Amplifier and PSU Board Parts List Issue 3.0 Designator Part Description BR200 3BGBU8D BRIDGE RECTIFIER 8A 200V C100 2C210 MLC 1N0 50V X7R 10% SM C200 2D168 PPRO 680P 5% 63V RA C201 2C410 MLC 100N 50V X7R 10% SM C202 2C410 MLC 100N 50V X7R 10% SM C203 2C410 MLC 100N 50V X7R 10% SM C204 2C410 MLC 100N 50V X7R 10% SM C205 2K233 SUPPR CAP 3N3 250V C206 2K233 SUPPR CAP 3N3 250V C207 2K233 SUPPR CAP 3N3 250V C208 2K233 SUPPR CAP 3N3 250V C209 2N910A ELST 10m 63V RA 35mm C210 2N910A ELST 10m 63V
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L882 Amplifier and PSU Board Parts List Issue 3.0 Designator Part Description C403 2N710 ELST 100U 25V C404 2N710 ELST 100U 25V C405 2N610 ELST 10U 50V C406 2N710B ELST 100U 100V C407 2C110 MLC 100P 50V NPO 5% SM C408 2C110 MLC 100P 50V NPO 5% SM C409 2C410 MLC 100N 50V X7R 10% SM C410 2C410 MLC 100N 50V X7R 10% SM C411 2H410 PCRB 100N 100V 10% RA 5mm C412 2C310 MLC 10N 50V X7R 10% SM C413 2C410 MLC 100N 50V X7R 10% SM C414 2C410 MLC 100N 50V X7R 10% SM C415 2C410 MLC 100N 50V X7R 10% SM C416 2D
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L882 Amplifier and PSU Board Parts List Issue 3.0 Designator Part Description IC202 5J7414D SURFACE MOUNT HEX SCHMITT TRIGGER IC300 5B072D IC AUDIO SM DUAL TL072 IC400 5B072D IC AUDIO SM DUAL TL072 L200 7D327 27mH INDUCTOR L300 7D002C INDUCT 2U2 12x20mm L400 7D002C INDUCT 2U2 12x20mm PCB L882PB_3 PRINTED CIRCUIT BOARD PL100 8K6201 2WAY MOLEX VERT MALE CONNECTOR PL101 8K6201 2WAY MOLEX VERT MALE CONNECTOR PL300 8K6201 2WAY MOLEX VERT MALE CONNECTOR PL400 8K6201 2WAY MOLEX VERT MALE CONNECTOR R100
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L882 Amplifier and PSU Board Parts List Issue 3.0 Designator Part Description R310 1A247 RES SM W4 1% 4K7 1206 R311 1A310 RES SM W4 1% 10K 1206 R312 1A310 RES SM W4 1% 10K 1206 R313 1A310 RES SM W4 1% 10K 1206 R314 1A247 RES SM W4 1% 4K7 1206 R315 1A110 RES SM W4 1% 100R 1206 R316 1A110 RES SM W4 1% 100R 1206 R317 1A110 RES SM W4 1% 100R 1206 R318 1A110 RES SM W4 1% 100R 1206 R319 1A110 RES SM W4 1% 100R 1206 R320 1A110 RES SM W4 1% 100R 1206 R321 1A022 RES SM W4 1% 22R 1206 R322 1A022 RES SM W4
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L882 Amplifier and PSU Board Parts List Issue 3.0 Designator Part Description R416 1A110 RES SM W4 1% 100R 1206 R417 1A110 RES SM W4 1% 100R 1206 R418 1A110 RES SM W4 1% 100R 1206 R419 1A110 RES SM W4 1% 100R 1206 R420 1A110 RES SM W4 1% 100R 1206 R421 1A022 RES SM W4 1% 22R 1206 R422 1A022 RES SM W4 1% 22R 1206 R423 1A022 RES SM W4 1% 22R 1206 R424 1A210 RES SM W4 1% 1K0 1206 R425 1A210 RES SM W4 1% 1K0 1206 R426 1A210 RES SM W4 1% 1K0 1206 R427 1A322 RES SM W4 1% 22K 1206 R428 1A247 RES SM W4
