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NAD C 372 Service Manual

Manual is about: Stereo Integrated Amplifier

Summary of C 372

  • Page 1

    Nad ser vice manual c 372 stereo amplifier c 37 2 stereo amplifier november 2006.

  • Page 2: Specifications

    Specifications stereo mode continuous average power = 150 w (21.8 dbw) output into 8 ohms or 4 ohms (min. Power per channel, 20 hz – 20 khz, both channels driven, with no more than rated distortion) rated distortion = 0.03% (thd 20 hz – 20 khz) clipping power = 170 w (maximum continuous power per ch...

  • Page 3

    Alignment procedure (c372) i. Initial adjustment (no load connected) a. Output offset voltage 1. Connect a dc millivoltmeter between tp303 & tp304 (pin 1 of ic 301a & gnd), then adjust vr303(50kohms) to get a reading as close as 0v as possible, +/-3v. 2. Connect a dc millivoltmeter between tp403 & t...

  • Page 4: Main Board

    Main board 4.

  • Page 5

    5.

  • Page 6

    B649 e c b 2sb649 2sd669 port2/0 port2/1 port2/2 port2/3 port2/4 port2/5 port2/6 port2/7 vcc xtal2 xtal1 port3/1 port3/2 port3/3 port0/0 port0/1 port0/2 gnd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 z86c0812psc 1 2 3 4 5 6 7 8 9 10 11 12 13 14 gnd vcc 74ls00 ic902: qp0 qp1 qp2 qp3 qp4 qp5 qp6 qp7...

  • Page 7

    C25 2n2 c26 2n2 chassis chassis to star gnd to star gnd rlo2a rlo4a r vsp sp0r sp0l l vsp power amp from right to speakers l offset l phones r phones r offset la lb la- lb- ra- rb- ra rb cb1 spk-out rlo3a rlo1a power amp from left 2sa1943 b c e 2sc5200 2sa872 2sa1015 2sc1815 a872 e c b b649 tl431 lm...

  • Page 8

    S004 s003 c005 c004 c003 s004 s003 s002 c001 s002 s001 s002 s006 s006 s007 s006 s006 s008 s009 s008 f002 s009 f004 f005 f006 f001 f003 s009 f012 f010 f011 f009 f008 f007 s010 t001 r001 r002 r003 s009 f008 f016 f015 f014 f013 s013 s014 f019 f017 f018 f021 f020 f022 s015 c012 s017 c015 c014 s016 c009 ...

  • Page 9

    Exploded view parts list ref. No part no. Description qty. Ref. No part no. Description qty. C001 67-005010-0 transformer shielding box 1 f007 76-001001-0 ir lens 1 c002 01-37205-10 assemblied pre amp module 2 f008 76-003001-0 led lens 12 c003 18-37371-22 transformer c version 1 f009 77-002002-1 ton...

  • Page 10

    Electrical parts list ref. No. Part no. 16-37202-01 l channel raw pcb 01-37202-01 assembled l channel pcb diodes d303, d304, d305, d306, d309 33-44148-02 1n4148 switch diode d302 33-11800-00 18v 1/2w zener diode d301 33-11800-01 18v 1/2w zener diode d307, d308 33-40021-01 bav21 switch diode transist...

  • Page 11

    Electrical parts list ref. No. Part no. Description r393 07-20243-10 24k ¡ 1/4w ±5% metal film resistor r305, r313 07-20273-10 27k ¡ 1/4w ±5% metal film resistor r321, r378, r327 07-20393-10 39k ¡ 1/4w ±5% metal film resistor r318 07-20473-10 47k ¡ 1/4w ±5% metal film resistor r324, r326 07-20104-10...

  • Page 12

    Electrical parts list ref. No. Part no. Description ics 4ic1, 4ic2 03-00431-00 tl431/ka431 ic, regulator ic401 03-00082-00 tl082d ic, op-amp capacitors c405, c407 05-22052-00 22pf 500v ±20% cermatic disk capacitor c402 05-68152-00 680pf 500v ±20% cermatic disk capacitor c425, c426 05-47152-00 470pf ...

  • Page 13

    Electrical parts list ref. No. Part no. Description r467 07-70471-08 t0=80 c degree pth9m04bf471ts2f333 ptc r466 07-70022-09 t0=90 c degree st-22 90c thermal breaker vr402 09-02501-00 500 ¡ variable resistor vr401 09-02503-00 50k ¡ variable resistor inductors l401, l402 08-02100-00 10uh inductor con...

  • Page 14

    Electrical parts list ref. No. Part no. Description 14 connections cz501 14-37208-00 8p2.54-a50b connection cb502 13-22504-00 xhb 2.54a-4a connection 16-37205-00 pre amp module raw pcb 01-37205-00 assembled pre amp module pcb transistors q804, q809 31-00209-00 2sk209gr j-fet q801, q807 31-01312-00 2...

  • Page 15

    Electrical parts list ref. No. Part no. Description 15 ic906 03-02400-00 at24c01 ic, eeprom ic901 03-07400-00 74ls00 n ic, logic ic ic904, ic905 03-04094-00 hef4094/cd4094 ic, logic ic ic902 03-86812-05 z86e0812psc/g ic, mcu used with ic906 at24c01 ic902 03-86812-06 z86e0812psc/g i c, mcu used with ...

  • Page 16

    Electrical parts list ref. No. Part no. Description d719, d720 33-14709-00 4.7v 1/2w zener diode d714 33-16809-00 6.8v 1/2w zener diode d729 33-11000-00 10v 1/2w zener diode d700 33-11300-00 13v 1/2w zener diode d741, d742 33-11800-00 18v 1/2w zener diode d721 33-12400-02 (24v, with 24v relay) 5w ze...

  • Page 17

    Electrical parts list ref. No. Part no. Description c736, c737 06-47012-00 47uf, cd110 100v ±20% alu electrolytic capacitor c738, c739 06-10121-02 100uf, cd263 25v ±20% alu electrolytic capacitor c112, c213 06-22121-00 220uf, cd110 25v ±20% alu electrolytic capacitor c781 06-33111-01 330uf, cd110 16...

  • Page 18

    Electrical parts list ref. No. Part no. Description r729, r731 07-22202-10 22k ¡ 1/4w ±1% metal film resistor r751 07-22702-10 27k ¡ 1/4w ±1% metal film resistor r758 07-26202-00 62k ¡ 1/6w ±1% metal film resistor r767 07-23903-10 390k ¡ 1/4w ±1% metal film resistor r102, r104, r106, r108, r110, r11...

  • Page 19

    Electrical parts list ref. No. Part no. Description 16-37206-00 relay board raw pcb 01-37206-01 relay board with components (c version) 01-37206-02 relay board with components (ah version) diodes d712 33-44148-02 1n4148 switch diode capacitors c702 05-47242-00 4.7nf, 400v, ±20%, ct81 high-voltage ce...

  • Page 20

    Electrical parts list ref. No. Part no. Description 18-37371-22 td-230-0300a(c version) main transformer 18-37371-12 main transformer 18-37060-01 td050-e103s standby transformer 15-10125-00 t582-ah(ah version) ac cord 15-10250-00 t582-c(c version) ac cord td-120-0300b(ah version) others 20

  • Page 21

    Protect ic change r19 56k r10 100k q13 2sc1815gr q14 2sc1815gr 1 2 3 4 5 6 7 8 j10 con8 d10 1n4148 r15 10k q10 2sa1015gr r16 10k r11 100k r13 10k q15 2sc1815gr r22 820k r20 220k q16 2sc1815gr q17 2sc1815gr r25 4.7k r24 180k q11 2sa1015gr r12 10k r21 220k q18 2sc1815gr q12 2sa1015gr r17 100k d12 1n41...

  • Page 22: Ser

    Ser vice manual © nad 200 4 c 37 2 stereo am plifie r nad electronics international toronto.