S250 FIVE CHANNEL POWER AMPLIFIER

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1 SERVICE MANUAL S250 FIVE CHANNEL POWER AMPLIFIER S250 FIVE CHANNEL POWER AMPLIFIER

2 CONTENTS FRONT PANEL / REAR PANEL VIEW SPECIFICATIONS ALIGNMENT PROCEDURE / ALIGNMENT POINTS WIRING DIAGRAM PCB LAYOUT SCHEMATIC DIAGRAM ELECTRICAL PARTS LIST EXPLODED VIEW EXPLODED VIEW PARTS LIST PACKING DIAGRAM Replacing the Fuses SERVICE SAFETY PRECAUTIONS CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE. REFERENCE NO. PART NUMBER DESCRIPTION PSU Board F*AH! A 250V Time Lag 6.3x32mm UR F*C! A 250V HBC Time Lag 5x20mm SEMKO/VDE Amp Board F-F2*AH! A 250V Time Lag 5x20mm UL F-F2*C! A 250V HBC Time Lag 5x20mm SEMKO/VDE NOTE: *AH : North American version only *C : European version only 2. Safety-check out (North American model only) Before returning the product to the customer, make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from the supply circuit. Parts marked with the symbol! are critical with regard to the risk of fire and electric shock. Replace only with parts recommended by the manufacturer.

3 FRONT PANEL / REAR PANEL VIEW FRONT PANEL CONTROLS NAD Five Channel Power Amplifier S250 PROTECTION SOFT CLIPPING 2. POWER SWITCH 3. PROTECTION INDICATOR 2. POWER INDICATOR. SOFT CLIPPING INDICATOR 3 The graphic symbol of a lightning 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 unit. Only qualified service personnel should make such attempt. The graphic symbol of an exclamation point within an equilateral triangle warns a user of the device that it is necessary to refer to the instruction manual and its warnings for proper operation of the unit. REAR PANEL CONNECTIONS AUTO TRIGGER 2V TRIGGER IN AC MAINS INPUT 20V 6 7. LEVEL CONTROL 5. 2V TRIGGER INPUT 2. INPUT JACK 6. SPEAKER TERMINALS 3. SOFT CLIPPING SWITCH 7. AC INLET. AUTO TRIGGER SWITCH

4 SPECIFICATIONS Specifications are measured in accordance with IHF standard IHF-A-202, 978. NOMINAL LIMIT. THD 0.02% 0.03% 2. Continuous Power Output 8 ohms 25W 00W 20kHz, 5 ch. for 8 ohms, ch. for ohms) ohms 25W 00W 3. Clipping Power 35W 0W. S/N Ratio A-wtd 96dB 93dB maximum) Audio BPF 89dB 86dB 5. Frequency Response 0 ~ -0.dB 0 ~ -0.25dB 6. Input Sensitivity 00 ± 2 mv 00 ± 3 mv maximum) 7. Channel Separation khz 77dB 70dB 20kHz 67dB 50dB 8. Soft Clipping Output Reduction 0. ~ 0.6 db 0.3 ~.0 db THD 5 ~ 6.5% ~ 0%

5 ALIGNMENT PROCEDURE IDLE CURRENT ALIGNMENT FOR EVERY POWER AMPLIFIER MODULE. Remove the load and the input signal. 2. Connect a digital voltmeter between TP and TP2. 3. Switch the amplifier on and, after one minute, adjust R27 to obtain a reading of 5mV ±0.5mV.. Leave power on for 3 minutes to allow the idle currents to stabilize. Re-adjust R27 as necessary to obtain a reading of.mv ±0.5mV. ADJUSTMENT POINTS R27 RELAY R R0 R TP2 R5 J TP

6 WIRING DIAGRAM J2 J2 J2 J2 J2 J - J3 J - J3 J - J3 J - J3 J - J3 CHANNEL AMP BOARD CHANNEL 2 AMP BOARD CHANNEL 3 AMP BOARD CHANNEL AMP BOARD CHANNEL 5 AMP BOARD J J J J J J8 J7 J9 J5 J J3 J2 J PSU BOARD M M2 M3 M M5 M6 J27 J28 PSN PSL BRN BLU 20V MAIN TRANSFORMER BRN BLU SS SS2 230V S3 S5 M2 S2 YEL YEL S M5 S S2 S3 S S5 S6 J26 M S VIO ORN GRY BLU BRN 20V STANDBY TRANSFORMER S6 M M3 M6 BRN BLU 230V TRIGGER SWITCH BOARD J22 GRN-YEL (230V ONLY) J2 PROT/SC LED BD CHASSIS J25 PWR LED BD YEL YEL STANDBY TRANSFORMER BRN BLU BRN BLU BLU (20V) BRN BLU VIO AC INLET L E N BLU (230V) BRN (230V) BRN (20V) EMI FILTER BLU (230V) BRN (230V) POWER SWITCH MAIN TRANSFORMER ORN GRY

7 PSU BOARD - COMPONENT SIDE PSU BOARD - SOLDER SIDE

8 RETURN TO CONTENTS PCB LAYOUT AMP BOARD - COMPONENT SIDE AMP BOARD - SOLDER SIDE

9 SW LINE FILTER FOR 230V VERSION ONLY M0 AC 3 NEUTRAL Line 2 2 Filter LIVE AC INLET POWER SWITCH R06 K T6.3A 250V SEMKO/VDE R U02B HEF0 0 U02A HEF0 R0 6R8 W C 7nF 250V R03 K MAIN POWER TRANSFORMER T C2 0.u C3 0.u C 0.u C6 0.u D DIO-BRIDGE C5 0.0u C7 0.0u C uF/80V J J2 J3 J J5 J6 J7 J8 J9 J0 8 9 F POWER SUPPLY 7 5 5V R HEF0 J2 DC IN D03 IN8 R07 K R08 0K U02D SW2 U02C D0 IN8 D05 5V6 HEF0 AUTO POWER SW R05 R D202 IN8 DGND 3 U03 IN 78L05 OUT GND C03 0.u 2 C02 70u/25V T02 STANDBY TRANSPORWER MAIN TRANSFORMER M M2 M3 M M5 M6 20V 230V BRN BRN BLU BLU STANDBY TRANSFORMER S S2 S3 S S5 S6 20V 230V BLU BRN BRN BLU FUSE T2.5A 250V UL/CSA 5V C 0u/00V NP DGND C2 0u/00V NP Q0 TRIAC 20A U0 TLP3063 R8 3K9 2W D IN75A D0 IN75A R 300R FP R 750R /2W R2 750R /2W R9 390R ON OFF SW3 SOFT CLIPPING CLIP SWITCH PCB R6 300R FP R0 3K9 2W D2 IN75A D3 IN75A POWER LED PCB V K A LED POWER VCTL R7 0K 2W CILP PROTECT PCB K A V LED2 LED CLIP LED3 PROTECT -VCTL K A V- R2 R FP R3 R FP D2 IN00 D3 IN00 R 0K 2W C0.7u 00V R 560R Q02 2SC85 V V- C uF/80V R5 0K 2W 5V R2 0K CH-5 V VCTL V- -VCTL GND PROTECT LED

10 J- F T6.3A 250V V R63 R FP Q25 2N688 V J-2 C2 0. Q26 MPSA06 J-3 J- VCTL R65 7K5 W R67 2K2 C35 70u/6V 20% V- J-5 J-6 F2 T6.3A 250V C25 0. C33 00u/6V D9 IN7 2% -VCTL GND COM J-7 J-8 C26 R60 D C3 00u/6V 20% D20 IN7 UC NE5532 J-9 D23 AGND GND R66 7K5 W R68 2K2 C36 70u/6V 20% PROTECT LED J-0 PROTECT Q27 MPSA56 V- R6 R FP Q28 2N69 7 INSERT BUSS WIRE JUMPER FOR R22. R50 5. SIGNIFIES SAFETY CRITICAL COMPONENTS REFER TO THE SAFETY INFORMATION SECTION OF THE SERVICE MANUAL FOR COMPLETE INFORMATION. COMPONENTS NOT INSTALLED: C0. C2. C. C5. C2. C26. D. D2. D3. D. D23. D2 R8. R20. R9. R52. R53. R60. R67. R68 AND R ABBREVIATION: FLAME PROOF = FP. ALL FP DESIGNATED PARTS ARE SAFTEY CRITICAL REFER TO NOTE 5. ALL CAPACTORS ARE IN MICROFARADS. 0%. 00V. ( DEFAULT VOLTAGE ) ALL RESISTORS ARE IN OHWS /W 5% 8 2V C37 0.u C27 0.u 2 0 U2A LM339 U2D LM339 3 U2C LM339 U2B LM339 RYDRV 50V 50V U2E LM339 C38 0.u C28 0.u 50V 50V GND AGND -2V 2V 2V AMPOUT 2V ILIMIT 2V R75 50K R76 5K C20 22u/25V 20% R69 00K R72 5K R62 20K D7 IN00 R57 M C3 22u/25V 20% R78 2K2 % R8 5K % R80 825R R79 K % NTC D2 IN8 AGND D22 IN8 R73 20K R7 20K C8 22u/25V 20% D8 IN8 R70 200K D5 IN8-2V R83 2K2 % R6 20K R56 M R58 200K D6 IN8 AGND R77 K5 % R5 20K R55 200K 2V R85 00R /2W FP Q 2N SCHEMATIC DIAGRAM POWER AMP

11 PROTECT D90 IN8 R53 330R LED GREEN R90 560R R50 2K2 R8 K7 RYDRY C3 u/50v UA NE5532 R 2M2 R5 K % AMPOUT R K % J2 C 20pF R7 50K C2 0.u/50V R3 2M2 Q20 2SC2362K Q2 2SA06K C8 0 C6 0 R R V 00V FP FP -VCTL VCTL Q2 2SC2362K Q3 2SC2362K R7 K5 C 70pF R 82 R2 82 Q5 2SA06K Q6 2SA06K R7 K5 R8 00 C5 70pF R5 82 R6 82 R3 7K5 R 7K5 Q 2SA360 R0 300 R23 00K C7 68pF D3 IN8 D IN8 R25 3K9 Q7 2SC323 R9 300 R2 00K C9 68pF R26 K C30 0.u /50V Q8 2SC323 R27 K D D2 R22 JPR FDBK R9 00R -2V 2V % % % % % % FP % CW R29 33 Q9 2N03 R28 20K C 22u/25V 20% R32 00 FP D5 IN3070 D6 IN3070 R Q2 2SC323 R59 00 Q0 MPSA06 Q MPSA56 R33 00 R D7 IN3070 C R82 00 C R20 R8 R3 3K3 D9 IN3070 Q3 2SA360 D8 IN3070 R30 3K3 C C5 Q 2SC793 R38 0 FP R2 0 FP R3 K R36 00 FP Q6 2SD975 R35 00 Q5 2SA837 R37 00 FP R3 0 FP R39 0 FP Q7 2SB R B J3 W3 C2 R8 57K6 FDBK RL D2 IN00 C7 0./250V R7 2R7 R6 57K6 C6 27pF Q8 2SD975 R0 0.22R R 0.22R R 0.22R R Q9 2SB37 C D0 IN00 D IN00 ILIMIT AMPOUT V- V W FP 000V FP 5% /2W FP /2W FP /2W 20% 2W RYDRV TEST LOCATION 5W 5W 5W 5W 000V % % 7 TEST LOCATION 2 000V 000V 000V 000V UB % CHGND GND CW B-COLOUR AGND CHGND CHGND R5 Jumper D2 Jumper GND FP GND C0.7uF/00V GND -2V AGND POWER AMP 2

12 ELECTRICAL PARTS LIST Location Part Number Description POWER AMP PCB PCB ASSEMBLY 000*AH PCB-N0920C-AMP PCB ASSY POWER AMP 000*C PCB-N092C-AMP PCB ASSY POWER AMP CAPACITORS C39 50N-03M-5-SS CC KV 0.0u 20% RL C 50N-2K-5-II CC KV 20P 0% RL 5X5 C6 50N-270K-5-II CC KV 27P 0% RL 5X5 C,C5 50N-7K-5-II CC KV 70P 0% RL 5X5 C7,C9 50N-680K-5-II CC KV 68P 0% RL 5X5 C3 53F-05J-5-NUN CM 50V u 5% RL 7.5X C22,C23 53H-03J-5-MMN CM 00V 0.0u 5% RL 7X7 C2,C25 53H-0J-5-TXN CM 00V 0.u 5% RL 0.5X C2,C27,C28,C30, 53I-0J-5-NMN CM 63V 0.UF RL (7.5X7) C37,C38 C7 53R-0J-5-YRM CM 250V 0.u 5% RL C35,C36 57D-77M-5-OVK CE 6V 70UF 20% RL C33,C3 57E-07M-5-KUK CE 25V 00UF 20% RL C,C3,C8,C20 57F-226M-5-IUK CE 50V 22uF 20% RL 5X C6,C8 57H-06M-5-OVH CE 00V 0u 20% RL IC U IC NE5532 OP AMP PHILIPS U IC LM339N QUAD OP-AMP LED D RG LED /GREEN 5.0 RELAY RL RELAY 2VDC 30A RESISTOR R63,R J-2-P RMF /W R 5% AT FP R38,R39,R2,R J-2-P RMF /W 0R 5% AT FP R32,R33,R36,R J-2-P RMF /W 00R 5% AT FP R J-2-P RMF /W K 5% AT FP R RMF /W.5K % AT R7,R J-2-P RMF /W.5K 5% AT FP R,R2,R5,R RMF /W 82R % AT R28,R5,R6,R62, A-2 RMF /W 20K % AT R73,R7 R78,R RMF /W 2.2K % AT Location Part Number Description R A-2 RMF /W 2.2K % AT R3,R A-2 RMF /W 2.2M % AT R6,R0,R9,R J-2-P RMF /W 300R 5% AT FP R A-2 RMF /W 33R % AT R A-2 RMF /W 330R % AT R A-2 RMF /W 3.9K % AT R A-2 RMF /W.7K % AT R72,R A-2 RMF /W 5K % AT R A-2 RMF /W 50K % AT R A-2 RMF /W 560R % AT R6,R RMF /W 57.6K % AT R87,R A-2 RMF /W 680R % AT R3,R RMF /W 7.5K % AT R RMF /W 825R % AT R RMF /W 9.53K % AT R35,R J-2-P RMF /2W 00R 5% AT FP R30,R A-2 RMF /2W 3.3K % AT R65,R J-2-X RMF W 7.5K 5% AT METAL R7 79-2R7J-2-X RMF 2W 2.7R 5% AT METAL R9,R8,R59,R82 7G-0A-2-E RMF 0.6W 00R % AT R,R5,R2,R26 7G-02A-2-E RMF 0.6W K % AT R23,R2,R69 7G-0A-2-E RMF 0.6W 00K % AT R56,R57 7G-05A-2-E RMF 0.6W M % AT R55,R58,R70 7G-20A-2-E RMF 0.6W 200K % AT R0,R,R,R5 7B-R22J--E RWR 5W 0.22R 5% AL AL05 DIODES D5-D DIODE BAV2 AT D0-D2,D DIODE IN00 AL D3,D,D5,D6, DIODE N8 AT D8,D2,D22,D90 D9,D V6-2 DZ W 5V AT TEMIC TRANSISTOR Q,Q TR 2N03 PNP HFE Q7,Q8,Q TR 2SC323 (Y) RL Q6,Q TR 2SD975 S.P RL Q7,Q TR 2SB37 S.P RL Q TR 2SA RL Q TR 2SC RL Q TR 2N688 T022B RL Q TR 2N69 T022B RL Q,Q TR 2SA360 (Y) RL Q5,Q6,Q TR 2SA06K (G) HFE Q2,Q3,Q TR 2SC2362K (G) HFE

13 Location Part Number Description Q0,Q TR MPSA06 VCE 80V NS Q,Q TR MPSA56 VCE 80V NS VR VR VR RK09K 50KA LM=25mm SVR SVR K EVM-3G 6mm DUST FUSE F,F2*AH FU T6.3A 250V 5X20 UL F,F2*C FU T6.3A HBC 5X20 MISCELLANEOUS J CENTER HEADER 3.96MM FH,FH FUSE HOLDER TP2,TP TERMINAL PIN GROUND TERMINAL R NTC THERMISTOR K (B) POWER SUPPLY PCB PCB ASSEMBLY 00*AH PCB-N0920C-PSU PCB ASSY POWER SUPPLY 00*C PCB-N092C-PSU PCB ASSY POWER SUPPLY CAPACITORS C03 50F-0K-5-II CC 50V 0.uF 0% RL 5x5 C-C7 50N-03M-5-SS CC KV 0.0u 20% RL C2,C3 53R-0J-5-YRM CM 250V 0.u 5% RL C02 57E-77M-5-SXK CE 25V 70UF 20% RL C,C2 57H-06M-5-OVH CE 00V 0u 20% RL C0 57H-75M-5-IUC CE 00V.7UF 20% RL C CAP00V 700P C8,C CE 80V 33000uF 20% DIODES D DIODE N00 AT D2,D DIODE IN00 AL D03,D DIODE N8 AT D B6-2 DZ /2W ROHM D0-D V6-2 DZ W 6V AT TEMIC D BRIDGE RECTIFIER MP250W TRANSFORMER T TRANS EI35 5/230V DC Location Part Number Description TERMINAL AC INLET J7-J9,M-M6,PSL, SPADE TERMINAL 6.3X0.8 PSN,S-S6,SS,SS2, J-J PCB CONN.(CENTER 3.96MM J S-00 2P ST.WAFER J S-00 3 PIN ST. WAFER J S-00 WAFER 8P P2.5 ST. IC U IC NJM78L05A 826 U IC TLP3063 PHOTO TRIAC U IC HFE 0BP QUADRUPLE RESISTOR R A-2 RMF /W R % AT R2,R J-2-P RMF /W 0R 5% AT FP R03,R06,R A-2 RMF /W K % AT R08,R A-2 RMF /W 0K % AT R,R J-2-P RMF /W 300R 5% AT FP R A-2 RMF /W 33R % AT R A-2 RMF /W 390R % AT R0,R 75-56A-2 RMF /W 560R % AT R0 78-6R8J--X RMF W 6.8R 5% AL METAL R,R5,R J--X RMF 2W 0K 5% AL METAL R8,R J--X RMF 2W 3.9K 5% AL METAL R,R2 7G-75A-2-E RMF 0.6W 750R % AT TRANSISTOR/TRIAC Q TR 2SC85 (G.R) RL Q TR BTA26A-600B RL FUSE F*C FU T6.3A HBC 5X20 F*AH FUSE T2.5A 250V UR HEATSINKS HEAT SINK HEATSINK FOR BRIDGE MISCELLANEOUS POWER SWITCH DPST INSULATING BOOT (ID=) FL*C EMI FILTER 20DBAG INSULATION SHEET 2X27 FH*AH FUSE HOLDER 6.5MM PITCH

14 Location Part Number Description FH*C FUSE HOLDER GND BRACKET, GROUNDING TRIGGER SW PCB PCB ASSEMBLY 200 PCB-N0920C-SW PCB ASSY TRIGGER SWITCH WAFERS/JACKS J DC JACK 3.5 J R-00 8 PIN RIGHT ANGLE WAFER RESISTOR J2C 75-72A-2 RMF /W.7K % AT SWITCH SW02,SW SLIDE SW DPDT VERT MM PROTECT LED PCB PCB ASSEMBLY 300 PCB-N0920C-LED PCB ASSY PROTECT LED WAFER J R-00 WAFER 3P P2.5 RIGHT LED LED B LED 3MM FLAT TOP BLUE LED R LED 3MM DIA POWER LED PCB PCB ASSEMBLY 00 PCB-N0920C-PSW PCB ASSY POWER LED WAFERS J R-00 WAFER 2P P2.5 RIGHT LED LED B LED 3MM FLAT TOP BLUE Parts marked with the symbol are critical with regard to the risk of fire and electric shock. Replace only with parts recommended by

15 EXPLODED VIEW SOFT CLIPPING PROTECTION Five Channel Power Amplifier S250 2 NAD

16 EXPLODED VIEW PARTS LIST Location Part Number Description Quantity S POWER BUTTON 2 S FRONT PANEL 3 S SUBFASCIA S LEFT SIDE PANEL 5 S RIGHT SIDE PANEL 6*AH S REAR PANEL 20V 6*C S REAR PANEL 230V 7 S REAR PANEL BAR B 8 S REAR PANEL BAR A 9 S HEATSINK B 0 S HEATSINK A S HEATSINK BAR 2 S TOP COVER 3 S BASE PLATE S DIECAST FOOT TIE-WRAP STANDBY TRANSFORMER POWER TRANSFORMER 8*C EMI FILTER 20DBAG POWER SWITCH RCA JACK SPEAKER TERMINAL BLACK SPEAKER TERMINAL AC INLET LEVEL KNOB 5 25 PCB-N0920C-SW 2V TRIGGER PCB 26*AH PCB-N0920C-AMP POWER AMP PCB 20V 26*C PCB-N092C-AMP POWER AMP PCB 230V 27*AH PCB-N0920C-PSU PSU PCB 20V 27*C PCB-N092C-PSU PSU PCB 230V 28 PCB-N0920C-PSW POWER LED PCB 29 PCB-N0920C-LED PROTECT LED PCB TRANSFORMER BOLT/NUT Parts marked with the symbol are critical with regard to the risk of fire and electric shock. Replace only with parts recommended by the manufacturer.

17 PROTECTION CLIPPING PACKING DIAGRAM NAD Five Channel Power Amplifier S REF. NO. PART NUMBER DESCRIPTION QTY LEFT CUSHION RIGHT CUSHION WRAPPING SHEET INNER CARTON BOX OUTER CARTON BOX WARRANTY CARD A OWNER S MANUAL GLOVES PAIR 39*AH! POWER CORD 20V 39*C! POWER CORD 230V

18 Copyright 2003 NAD Electronics International 633 Granite Court Pickering, Ontario Canada LW 3K 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 patents and other international property laws and are used with express permission or license agreements from the owners. Printed in Canada SERVICE MANUAL S250 FIVE CHANNEL POWER AMPLIFIER

Technical Manual FIVE-CHANNEL POWER AMPLIFIER RMB Table of Contents. Specification. (20-20kHz, < 0.03%)

Quality Uncompromised Technical Manual FIVE-CHANNEL POWER AMPLIFIER RMB-1095 Table of Contents Specification...1 Parts List...2,3 Adjustment...4 PCB Assembly...5,6,7,8 Schematic Diagram...9,10,11,12 Specification