NAD-S250-pwr-sm 电路图 维修手册.pdf
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1、SERVICE MANUALS250 S250 FIVE CHANNEL POWER AMPLIFIER FIVE CHANNEL POWER AMPLIFIER RadioFans.CN 收音机爱 好者资料库 CONTENTS FRONT PANEL / REAR PANEL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2、. . . . . . . . . . . . . . . . . 4 ALIGNMENT PROCEDURE / ALIGNMENT POINTS . . . . . . . . . . . . . . . . . . . . . . . . 5 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . .
3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-11 ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-14 EXPLODED VIEW .
4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5、 . . . . . . . . . 17 SERVICE SAFETY PRECAUTIONS 1. Replacing the Fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE. REFERENCE NO.PART NUMBERDESCRIPTION PSU Board F1*AH 5120-0506-012.5A 250V Time Lag 6.3x32mm UR F1*C 5120-0025-06.3A 250V HBC Time La
6、g 5x20mm SEMKO/VDE Amp Board F1-F2*AH 5120-0040-06.3A 250V Time Lag 5x20mm UL F1-F2*C 5120-0025-0 6.3A 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, m
7、ake 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. ! ! ! ! ! RadioFans.
8、CN 收音机爱 好者资料库 1. LEVEL CONTROL5. 12V TRIGGER INPUT 2. INPUT JACK6. SPEAKER TERMINALS 3. SOFT CLIPPING SWITCH7. AC INLET 4. AUTO TRIGGER SWITCH Five Channel Power Amplifier S250 3412 NAD SOFT CLIPPINGPROTECTION 1. POWER SWITCH3. PROTECTION INDICATOR 2. POWER INDICATOR4. SOFT CLIPPING INDICATOR FRONT
9、PANEL / REAR PANEL VIEW FRONT PANEL CONTROLS 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
10、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 AC MAINS INPUT 120V TRIGGER IN+12
11、V AUTO TRIGGER 21345 67 1 RadioFans.CN 收音机爱 好者资料库 RETURN TO CONTENTS SPECIFICATIONS Specifications are measured in accordance with IHF standard IHF-A-202, 1978. NOMINALLIMIT 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.
12、Clipping Power $135W$110W 4. S/N Ratio A-wtd$96dB$93dB maximum)Audio BPF$89dB$86dB 5. Frequency Response 0 -0.1dB0 -0.25dB 6. Input Sensitivity 100 2 mV100 3 mV maximum) 7. Channel Separation 1kHz$77dB$70dB 20kHz$67dB$50dB 8. Soft Clipping Output Reduction 0.4 0.6 dB0.3 1.0 dB THD 5 6.5%4 10% RETURN
13、 TO CONTENTS 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. Lea
14、ve 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 RETURN TO CONTENTS WIRING DIAGRAM J2 J3 +J4 - + J11 CHANNEL 5 AMP BOARD 1 J2 J3 +J4 - + J11 CHANNEL 4 AMP BOARD 1 J2 J3 +J4 - + J11
15、CHANNEL 3 AMP BOARD 1 J2 J3 +J4 - + J11 CHANNEL 2 AMP BOARD 1 J2 J3 +J4 - + J11 CHANNEL 1 AMP BOARD 1 PSNPSL S1 S2 S3 S4 S5 S6 M1 M2 M3 M4 M5 M6 SS1SS2 1 11 1 1 1 J18J17J19 J5 J4J3J2J1 RED BLK BLU BRN WHT YEL GRN-YEL (230V ONLY) GRY ORN VIO GRY ORN VIO RED BLK BLU BRN WHT YEL YEL YEL BRN (230V)BRN (
16、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 S1S2S3S4S5S6 M1M2M3M4M5M6 REDBLKBLUBRNWHT120V 230V 120V 230V BRNBLKWHTREDBLU BLKWHTREDBLUBRN BLKWHTREDBRNBLU MAIN TRANSFORMER STANDBY TRANSFORMER BLKREDBLKREDBLKREDBLKREDBLKRED LEN AC
17、INLET EMI FILTER POWER SWITCH STANDBY TRANSFORMER MAIN TRANSFORMER PSU BOARD TRIGGER SWITCH BOARD PWR LED BD PROT/SC LED BD J26 J27J28 J22 J24 J25 BLU (120V) BRN (120V) CHASSIS RETURN TO CONTENTS PSU BOARD - COMPONENT SIDE PSU BOARD - SOLDER SIDE Enter 200 to ZOOM RETURN TO CONTENTS PCB LAYOUT AMP B
18、OARD - COMPONENT SIDEAMP BOARD - SOLDER SIDE RETURN TO CONTENTS 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 24 3 5 M101 LINE FILTER FOR 230V VERSION ONLY 1 2 AC1 AC INLET POWER SWITCH T1 MAIN POWER TR
19、ANSFORMER D1 DIO-BRIDGE1 J1 J2 J3 J4 J5 J6 J7 J8 J9 J10 1 2 3 U102A HEF4011 4 5 6 U102B HEF4011 7 8 9 10 U102C HEF4011 11 12 13 14 U102D HEF4011 J2 DC IN R107 1K SW2 AUTO POWER SW R108 10K R104 560 T102 STANDBY TRANSPORWER R105 1R C102 470u/25V 3 2 1 U103 78L05 C103 0.1u +5V C12 10u/100V C11 10u/100
20、V R12 750R R11 750R R8 3K9 2W D105 5V6 D11 IN4745A D10 IN4745A D12 IN4745A D13 IN4745A R10 3K9 2W R6 300R FP R1 300R FP R9 390R 52 41 63 SW3 SOFT CLIPPING R7 10K 2W LED1 POWER LED2 LED CLIP LED3 PROTECT Q102 2SC1815 R112 10K C9 33000uF/80V R2 1R FP R3 1R FP R4 10K 2W R5 10K 2W C10 4.7u V+ V- V+ V- V
21、+ 1 2 34 5 6 U101 TLP3063 Line Filter NEUTRAL LIVE FUSE T12.5A 250V UL/CSA CH1-5 V+ +VCTL V- -VCTL GND 100V IN OUT GND NP NP 1/2W 1/2W ON OFF R111 560R +5V MAIN TRANSFORMER 120V 230V M1M2M3M4M5M6 BRN BRN BLK BLK WHT WHT BLURED REDBLU STANDBY TRANSFORMER 120V 230V S1S2S3S4S5S6 BLK BLK WHT WHT RED RED
22、 BLUBRN BRNBLU D202 IN4148 D103 IN4148 D104 IN4148 D3 IN4004 D2 IN4004 PROTECT LED POWER LED PCB CILP PROTECT PCB +VCTL -VCTL CLIP SWITCH PCB Q101 TRIAC 20A KA A A K KDGND DGND +5V POWER SUPPLY RETURN TO CONTENTS 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
23、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 11 10 13 + - U2C LM339 14 8 9 + - U2D LM339 12 3 U2E LM339 4 8 U1C NE5532 C37 0.1u C38 0
24、.1u C28 0.1u C27 0.1u R57 1M R58 200K D17 IN4004 C13 22u/25V 20% D16 IN4148 R54 20K Q1 2N4403 R56 1M R61 20K R55 200K R62 20K R83 2K21 1% R72 51K ILIMIT R69 100K R70 200KD15 IN4148 C18 22u/25V D18 IN4148 +12V +12V -12V +12V AMPOUT R76 51K C20 22u/25V D22 IN4148 D21 IN4148 R73 20K R75 510K R74 20K +1
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