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NAD C 272 Service Manual

Manual is about: Stereo Power Amplifier

Summary of C 272

  • Page 1

    Nad ser vice manual c 272 stereo amplifier c 27 2 stereo amplifier.

  • 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 (c272) i. Initial adjustment (no load connected) a. Output offset voltage 1. Connect a dc millivoltmeter to l channel tp2 (dc) and tp8 (gnd). 2. Turn unit “on” and adjust vr301 (100ohms) to get a reading of 0v+/-30mv. 3. Connect a dc millivoltmeter to r channel tp5 (dc) and tp7, ...

  • Page 5

    Draft c702 22n/250v c703 22n/250v c715 c716 q703 c1815 q702 a1015 tc701 tic116d tc702 tic116d r707 1k r713 22k r709 100 r711 1k r712 1k r708 1k r710 100 r714 22k r716 0.025/3w 10% r717 100 mf 1% q706 a1015 q707 a1015 r718 9k1 mf 1% r719 220k ! ! ! ! Red gry blk org vio ! ! ! ! H1 h2 l1 l2 52.1v ac 1...

  • Page 6

    Draft cin 11 cout 9 cout 10 rst 12 q4 7 q5 5 q6 4 q7 6 q8 14 q9 13 q10 15 q12 1 q13 2 q14 3 vcc 16 gnd 8 u801 cd4060 clk 11 d 12 sd 10 cd 13 q 9 q 8 u803b 74hc74 clk 3 d 2 sd 4 cd 1 q 5 q 6 7 14 u803a 74hc74 8 9 u802d 74hc14 10 11 u802e 74hc14 1 2 7 14 u802a 74hc14 3 4 u802b 74hc14 5 6 u802c 74hc14 ...

  • Page 7

    Wiring diagram.

  • Page 8

    F001 f002 f003 f004 f005 f006 f007 f008 f009 c001 c002 c003 c004 c005 c006 c007 r002 r003 r001 c008 c016 c010 c009 c011 c012 c015 c014 c013 c017 c018 r006 r004 c020 c021 c022 c019 c023 c024 c025 c026 c027 c028 c029 c030 c031 c032 c033 c034 c035 c036 c037 c038 c039 t001 c041 s001 s002 s001 s001 s001 ...

  • Page 9

    Ref.No part no. Description qty. Ref.No part no. Description qty. C001 66-026002-1 chassis 1 f001 67-026001-0 fascia 1 c002 66-005004-0 base cover 1 f002 67-018001-0 end cap l 1 c003 75-010004-1 foot 4 f003 67-018002-0 end cap r 1 c004 78-001002-0 foot pad 4 f004 76-003001-0 led lens 6 c005 66-00500...

  • Page 10

    Electrical parts list ref. No. P/n power amp board l channel (assembled amp pcb 01-27220-01 with heatsink) amp raw pcb 16-27220-01 cem-1 transistors q305, q309, q326, q316 31-01015-00 2sa1015gr to-92 transistors q301, q306, q307, q330 31-00872-00 2sa872a to-92 transistors q302, q303, q304, q329 31-0...

  • Page 11

    Electrical parts list ref. No. P/n description r328 07-20101-10 100ohms 1/4w ±5% metal film r309, r323 07-21000-10 100ohms 1/4w ±1% metal film r321 07-21001-10 1kohms 1/4w ±1% metal film r358 07-20101-21 100ohms 0.5w ±5% metal film r317 07-21500-10 150ohms 1/4w ±1% metal film r318 07-24702-10 47kohm...

  • Page 12

    Electrical parts list ref. No. P/n description r471 07-10222-00 2.2kohms 1/6w ±5% carbon film r413 07-10393-00 39kohms 1/6w ±5% carbon film r424 07-10104-00 100kohms 1/6w ±5% carbon film r408, r420, r436, r440 07-10330-10 33ohms 1/4w ±5% carbon film r404, r406, r412, r414, r470 07-10101-10 100ohms 1...

  • Page 13

    Electrical parts list ref. No. P/n description tc701, tc702 33-60116-00 tic116d/bt151-500r to-220 thyristor ics ic702 03-00317-00 lm317m to-220 regulator ic703 03-00337-00 lm337m to-220 regulator ic704 03-00082-00 tl082cp/d dip8 dual opamp ic705 03-01237-00 upc1237ha sip8-ic protection ic capactors ...

  • Page 14

    Electrical parts list ref. No. P/n description r748 07-10104-10 100kohms 1/4w ±5% carbon film r719 07-10224-10 220kohms 1/4w ±5% carbon film r751, r752 07-10105-10 1mohms 1/4w ±5% carbon film r102, r104, r202, r204 07-10225-00 2.2mohms 1/6w ±5% carbon film r101, r201 07-20221-00 220ohms 1/6w ±5% met...

  • Page 15

    Electrical parts list ref. No. P/n description diodes d701 33-44148-02 1n4148 sw diodes b705 33-30142-00 db104 rectifier bridge ic ic701 03-07805-00 7805 to-220 regulator capactors c766 05-47242-00 4n7 400v ±20% ceramic disk c707 24-10461-00 0.1uf 63v ±20% ceramic disk c710 24-10461-00 0.1uf 63v ±20...

  • Page 16

    Electrical parts list ref. No. P/n description resistor r815, r816, r817, r819 07-10103-13 10kohms 1/4w 5% carbon film resistor r802, r803, r804, r805, r806, r807, r808, r809, r818 07-10103-10 10kohms 1/4w 5% carbon film resistor r810, r811 07-10104-10 100kohms 1/4w 5% carbon film resistor r814 07-1...

  • Page 17: Ser

    Ser vice manual © nad 200 4 c 27 2 stereo am plifie r nad electronics international toronto.