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NAD S250, Service Manual, Page: 5 / 18

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NAD S250 Service Manual Download Page 5

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 for 3 minutes to allow the idle currents to stabilize.  Re-adjust R27
     as necessary to obtain a reading of 4.4mV ±0.5mV.

ALIGNMENT PROCEDURE

ADJUSTMENT POINTS

Summary of Contents for S250

Page 1: ...SERVICE MANUAL S250 S250 FIVE CHANNEL POWER AMPLIFIER FIVE CHANNEL POWER AMPLIFIER...

Page 2: ...506 0 12 5A 250V Time Lag 6 3x32mm UR F1 C 5120 0025 0 6 3A 250V HBC Time Lag 5x20mm SEMKO VDE Amp Board F1 F2 AH 5120 0040 0 6 3A 250V Time Lag 5x20mm UL F1 F2 C 5120 0025 0 6 3A 250V HBC Time Lag 5x...

Page 3: ...tning flash with an arrow point within a triangle signifies that there is dangerous voltage within the unit and it posses a hazard to anyone removing the cover to gain access to the interior of the un...

Page 4: ...125W 100W 20kHz 5 ch for 8 ohms 4 ch for 4 ohms 4 ohms 125W 100W 3 Clipping Power 135W 110W 4 S N Ratio A wtd 96dB 93dB maximum Audio BPF 89dB 86dB 5 Frequency Response 0 0 1dB 0 0 25dB 6 Input Sensit...

Page 5: ...ut 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 for 3 minutes to allow the idle...

Page 6: ...RED BLK BLU BRN WHT YEL YEL YEL BRN 230V BRN 230V BRN BLU BLU 230V BLU 230V RED WHT BLK RED RED WHT BLK RED RED WHT BLK RED RED WHT BLK RED RED WHT BLK RED S1 S2 S3 S4 S5 S6 M1 M2 M3 M4 M5 M6 RED BLK...

Page 7: ...PSU BOARD COMPONENT SIDE PSU BOARD SOLDER SIDE...

Page 8: ...PCB LAYOUT AMP BOARD COMPONENT SIDE AMP BOARD SOLDER SIDE...

Page 9: ...05 5V6 D11 IN4745A D10 IN4745A D12 IN4745A D13 IN4745A R10 3K9 2W R6 300R FP R1 300R FP R9 390R 5 2 4 1 6 3 SW3 SOFT CLIPPING R7 10K 2W LED1 POWER LED2 LED CLIP LED3 PROTECT Q102 2SC1815 R112 10K C9 3...

Page 10: ...K C20 22u 25V D22 IN4148 D21 IN4148 R73 20K R75 510K R74 20K 12V R80 825R R79 1K R81 15K 1 R78 2K21 1 R77 11K5 1 R85 100R 12V PROTECT 1W FP 20 2 1W FP V V 20 20 50V 50V 50V 50V 1 NTC 1 2W FP 20 20 C26...

Page 11: ...20 R32 100 FP D5 IN3070 D6 IN3070 R87 680 Q12 2SC3423 R59 100 Q10 MPSA06 Q11 MPSA56 R33 100 R88 680 D7 IN3070 C22 0 01 R82 100 C23 0 01 R20 R8 R31 3K3 D9 IN3070 Q13 2SA1360 D8 IN3070 R30 3K3 C14 C15...

Page 12: ...1 AT R3 R4 4715 225A 2 RMF 1 4W 2 2M 1 AT R6 R10 R19 R86 4715 301J 2 P RMF 1 4W 300R 5 AT FP R29 4715 330A 2 RMF 1 4W 33R 1 AT R53 4715 331A 2 RMF 1 4W 330R 1 AT R25 4715 392A 2 RMF 1 4W 3 9K 1 AT R8...

Page 13: ...3520 0 TRANS EI35 115 230V DC Location Part Number Description TERMINAL 0103 2113 1144 0 AC INLET J17 J19 M1 M6 PSL 2101 1231 0 SPADE TERMINAL 6 3X0 8 PSN S1 S6 SS1 SS2 J1 J5 2101 2171 0 PCB CONN CEN...

Page 14: ...200 3251 0 01 SLIDE SW DPDT VERT 4MM PROTECT LED PCB PCB ASSEMBLY 1300 PCB N0920C LED PCB ASSY PROTECT LED WAFER J24 2102 031R 004 WAFER 3P P2 5 RIGHT LED LED3 3700 3538 B LED 3MM FLAT TOP BLUE LED2 3...

Page 15: ...EXPLODED VIEW N A D SO FT CL IPP IN G PR OT EC TIO N F iv e C ha nn el P ow er A m pl ifi er S 25 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: ...AP 4 16 1806 3520 0 STANDBY TRANSFORMER 1 17 4554 0052 POWER TRANSFORMER 1 18 C 1806 3519 0 EMI FILTER 20DBAG5 1 19 5200 3441 0 POWER SWITCH 1 20 2113 1206 0 RCA JACK 5 21 4208 001 SPEAKER TERMINAL BL...

Page 17: ...059 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 PAIR 39 AH 4150 0009 POWER CORD 120V 1 39...

Page 18: ...L1W 3K1 No portion of this publication may be reproduced without the written permission of NAD Electronics International Many of the circuits and software programs described within are covered by pat...

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