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NAD S250 Service Manual

Other manuals for S250: Specifications, Owner's Manual

Summary of S250

  • Page 1

    S e r v ic e m a n u a l s 2 5 0 s250 five channel power amplifier f iv e c h a n n e l p o w e r a m p l if ie r.

  • Page 2: Contents

    Contents front panel / rear panel view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 alignment procedure / alignment points . . . . . . . . . . . . . . . ....

  • Page 3

    1. Level control 5. 12v trigger input 2. Input jack 6. Speaker terminals 3. Soft clipping switch 7. Ac inlet 4. Auto trigger switch five channel power amplifier s250 3 4 1 2 nad soft clipping protection 1. Power switch 3. Protection indicator 2. Power indicator 4. Soft clipping indicator front panel...

  • Page 4: Specifications

    Specifications s p e c i f i c a t i o n s a r e m e a s u r e d i n a c c o r d a n c e w i t h i h f s t a n d a r d i h f - a - 2 0 2 , 1 9 7 8 . Nominal limit 1. Thd #0.02% #0.03% 2. Continuous power output 8 ohms $125w $100w 20khz, 5 ch. For 8 ohms, 4 ch. For 4 ohms) 4 ohms $125w $100w 3. Clipp...

  • Page 5: Alignment Procedure

    R44 r40 r41 tp1 tp2 relay r27 j1 r45 idle current alignment for every power amplifier module 1. Remove the load and the input signal. 2. Connect a digital voltmeter between tp1 and tp2. 3. Switch the amplifier on and, after one minute, adjust r27 to obtain a reading of 5mv ±0.5mv. 4. Leave power on ...

  • Page 6: Wiring Diagram

    Wiring diagram j2 j3 + j4 - + j1 1 channel 5 amp board 1 j2 j3 + j4 - + j1 1 channel 4 amp board 1 j2 j3 + j4 - + j1 1 channel 3 amp board 1 j2 j3 + j4 - + j1 1 channel 2 amp board 1 j2 j3 + j4 - + j1 1 channel 1 amp board 1 psn psl s1 s2 s3 s4 s5 s6 m1 m2 m3 m4 m5 m6 ss1 ss2 1 1 1 1 1 1 j18 j17 j19...

  • Page 7

    Psu board - component side psu board - solder side.

  • Page 8

    Pcb layout amp board - component side amp board - solder side.

  • Page 9

    F1 t6.3a 250v semko/vde sw1 r102 33 c2 0.1u c3 0.1u c8 33000uf/80v c1 47nf 250v c4 0.1u c6 0.1u r101 6r8 1w r106 1k r103 1k c5 0.01u c7 0.01u 1 2 4 3 5 m101 line filter for 230v version only 1 2 ac1 ac inlet power switch t1 main power transformer d1 dio-bridge1 j1 j2 j3 j4 j5 j6 j7 j8 j9 j10 1 2 3 u...

  • Page 10

    J1-1 j1-2 j1-3 j1-4 j1-5 j1-6 j1-7 j1-8 j1-9 j1-10 f1 t6.3a 250v f2 t6.3a 250v c24 0.1 c25 0.1 r63 1r q26 mpsa06 q25 2n6488 r65 7k5 c33 100u/16v d19 in4744 d20 in4744 c34 100u/16v r66 7k5 q27 mpsa56 q28 2n6491 r64 1r r67 2k2 r68 2k2 c35 470u/16v c36 470u/16v 1 6 7 + - u2a lm339 2 4 5 + - u2b lm339 1...

  • Page 11

    Protect d90 in4148 r53 330r led1 green red r90 560r r50 2k2 r84 4k7 rydry c3 1u/50v 1 3 2 + - u1a ne5532 r4 2m2 r5 1k 1% ampout r1 1k 1% j2 c1 120pf r71 50k c2 0.1u/50v r3 2m2 q20 2sc2362k q21 2sa1016k c8 10 c6 10 r86 300 r6 300 100v 100v fp fp -vctl +vctl q2 2sc2362k q3 2sc2362k r7 1k5 c4 470pf r11...

  • Page 12

    Location part number description power amp pcb pcb assembly 1000*ah pcb-n0920c-amp pcb assy power amp 1000*c pcb-n0921c-amp pcb assy power amp capacitors c39 150n-103m-5-ss cc 1kv 0.01u 20% rl c1 150n-121k-5-ii cc 1kv 120p 10% rl 5x5 c16 150n-270k-5-ii cc 1kv 27p 10% rl 5x5 c4,c5 150n-471k-5-ii cc 1...

  • Page 13

    Location part number description q10,q26 4860-8890-0 tr mpsa06 vce 80v ns q11,q27 4860-8910-0 tr mpsa56 vce 80v ns vr vr71 4750-9606-1 vr rk09k111 50ka lm=25mm svr27 4755-1026-3-14 svr 1k evm-31g 6mm dust fuse f1,f2*ah 5120-0040-0 fu t6.3a 250v 5x20 ul f1,f2*c 5120-0025-0 fu t6.3a hbc 5x20 miscellan...

  • Page 14

    Location part number description fh1*c 4132-1011-0 fuse holder gnd1 4132-6221-0 bracket, grounding trigger sw pcb pcb assembly 1200 pcb-n0920c-sw pcb assy trigger switch wafers/jacks j2 2101-2191-0 dc jack 3.5 j22 2102-081r-004 8 pin right angle wafer resistor j2c 4715-472a-2 rmf 1/4w 4.7k 1% at swi...

  • Page 15: Exploded View

    Exploded view n a d s o ft c l ip p in g p r o t e c t io n f iv e c h a n n e l po w e r a m p lif ie r s 2 5 0 2 1 3 4 5 6 7 8 9 10 12 13 14 15 16 17 18 19 20 21 22 23 24 27 26 25 28 30 29 11 30

  • Page 16: Exploded View Parts List

    Exploded view parts list location part number description quantity 1 s100-2011-3 power button 1 2 s250-2002-1 front panel 1 3 s250-2003-3 subfascia 1 4 s250-2014-3 left side panel 1 5 s250-2024-3 right side panel 1 6*ah s250-2006-2 rear panel 120v 1 6*c s250-2006-2 rear panel 230v 1 7 s250-2057-1 re...

  • Page 17: Packing Diagram

    33 33 38 38 37 37 36 36 39 39 34 34 32 32 31 31 packing diagram ref. No. Part number description qty. 31 8700.0058 left cushion 1 32 8700.0059 right cushion 1 33 8700.0057 wrapping sheet 1 34 860129 inner carton box 1 35 860135 outer carton box 1 36 8120.0189 warranty card 1 38 8700.0056 gloves 1 pa...

  • Page 18

    S e r v ic e m a n u a l s 2 5 0 f iv e c h a n n e l p o w e r a m p l if ie r copyright 200 3 nad electronics international 633 granite court pickering, ontario canada l1w 3k1 no portion of this publication may be reproduced without the written permission of nad electronics international. Many of ...