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NAD Masters M3 Service Manual Download Page 24

INPUT SELECTOR

BALANCE AMP

DISC
CD
TUNER
INPUT4
INPUT5
INPUT6

BALANCE

0/6.5dB SELECTABLE GAIN

AMP STAGE

54dB ATTENUATOR

2dB/STEP

5dB TONE CONTROL

1dB/STEP

BIAMP HIGH PASS FILTER

2,2.5,3,3.5dB SELECTABLE GAIN

AMP STAGE

30dB ATTENUATOR

10dB/STEP

BY PASS, 40, 60, 80, 100Hz

PRE OUT1

PRE OUT2

INPUT SELECTOR

BALANCE AMP

DISC
CD
TUNER
INPUT4
INPUT5
INPUT6

BALANCE

0/6.5dB SELECTABLE GAIN

AMP STAGE

54dB ATTENUATOR

2dB/STEP

5dB TONE CONTROL

1dB/STEP

BIAMP HIGH PASS FILTER

2,2.5,3,3.5dB SELECTABLE GAIN

AMP STAGE

30dB ATTENUATOR

10dB/STEP

BY PASS, 40, 60, 80, 100Hz

PRE OUT1

PRE OUT2

STEREO/MONO

SWITCH

2. PREAMP SIGNAL PATH

LEFT CHANNEL

RIGHT CHANNEL

3-10

Summary of Contents for Masters M3

Page 1: ...SERVICE MANUAL SERVICE MANUAL M3 C AH MODE L M3 SE R VICE MANUAL NAD 2006 NAD ELECTRONICS INTERNATIONAL TORONTO M3 C AH Integrated Amplifier M3 C AH Integrated Amplifier Integrated Amplifier...

Page 2: ...CONTENTS SECTION 1 SUMMARY SECTION 2 CABINET MAIN CHASSIS SECTION 3 ELECTRICAL SECTION 4 REPLACEMENT PARTS LIST...

Page 3: ...LINES FOR AUDIO PRODUCTS 1 2 SERVICING PRECAUTIONS 1 3 General Servicing Precautions Insulation Checking Prodedure Electrostatically Sensitive Devices SPECIFICATIONS 1 6 7 1 1 ALIGNMENT PROCEDURE 1 4...

Page 4: ...ONENTS FOR FRAYED LEADS DAMAGED INSULATION INCLUDING A C CORD AND REPLACE IF NECES 5 NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR A RESISTOR RATED AT 1 WATT OR MORE LEAD TENSION AROUND PROTRUN...

Page 5: ...arts including Metal panels Input terminals Earphone jacks etc Electrostatically Sensitive ES Devices Some semiconductor solid state devices can be damaged easily by static electricity Such components...

Page 6: ...1 6 8kohms for 0V 0 1V B IDLING CURRENT AMP BOARD 1 Connect a DC Millivoltmeter betweenTP301 2 pins then adjust VR301 200ohms for 7 8mV reading on meter 2 Connect a DC Millivoltmeter between TP401 2 p...

Page 7: ...at L channel Balance input Connect a AC Millivoltmeter to preout1L then adjust R565 for lowest output level 2 Volum set 0dB Input 2V 10KHZ common mode sinwave signal at R channel Balance input Connec...

Page 8: ...t term power per channel 4ohms 480W 2ohms 785W Damping factor 150 Signal to noise ratio refer 1W A weighted 100dB Slew rate 20V sec T H D and SMPTE I M 0 01 Distortion from 250mW to rated output IHF I...

Page 9: ...puts Preamp output impedance Zone2 output impedance Controls Treble 5dB at 10kHz Bass 5dB at 100Hz Pre in Power AMP out input 2V Signal to Noise ratio A weighted 107dB ref 1 W out 500mV CD in SPK out...

Page 10: ...2 1 SECTION 2 CABINET MAIN CHASSIS CONTENTS EXPLODED VIEWS 2 2 1 Cabinet and main frame section 2 2 2 Packing accessory section 2 3 3 Exploded view parts list 2 4 5...

Page 11: ...006 R008 R007 R003 R005 C018 C019 C020 A001 A002 C022 C026 C009 C025 C008 PR01 PR02 PR03 PR04 PR06 T001 C027 PR05 C023 C024 C028 R009 A003 A004 A005 A006 S001 S001 S001 S002 S019 S002 S003 S004 S019 S...

Page 12: ...P006 P005 P001 P002 P003 P004 P008 P007 P011 P009 P013 P016 P015 P014 P012 P010 2 Packing accessory section 2 3...

Page 13: ...er Spacer Screw 16 C021 4 y s s A t o o F 0 0 1 0 8 4 0 3 8 A06 66 018005 0 Tem SW Clamper 2 C022 75 048022 0 Bus Bar Washer 4 C023 1 r e v o C C P 0 2 1 0 8 4 0 6 7 PR01 69 048032 0 Copper Spacer 2 C...

Page 14: ...MB3 8 10 S026 61 022206 0 Screws BTB2 6 8 P001 88 048001 0 Shipping Box 1 P002 1 x o B t f i G 0 2 0 0 8 4 0 8 8 P003 89 048001 0 Polyfoam Bottom 1 P004 89 048002 0 Polyfoam Cap 1 P005 87 048004 0 No...

Page 15: ...DIAGRAM 4 ENCODER AND CONNECT BOARD Circuit DIAGRAM 5 FRONT PANEL BOARD Circuit DIAGRAM 6 BALANCE INPUT BOARD Circuit DIAGRAM 7 POWER BOARD Circuit DIAGRAM PRINTED CIRCUIT DIAGRAMS 1 Preamp Main boar...

Page 16: ...wer supply is correct NO Press the standby button A ELECTRICAL TROUBLESHOOTING GUIDE 5V is Right NO YES Check the MCU on the keyboard Check U84 and Q82 Check the D81 Check F902 and F903 Check the main...

Page 17: ...rect NO Check Q990 Q991 Check D990 D991 YES A 72V power supply is correct Check R646 R647 R746 R747 R622 Check B606 B706 Check Q609 Q610 Q611 Check the PCB track THE END YES 72V power supply is correc...

Page 18: ...Relay respond properly NO YES Wate for 10 second Press listen mode biamp key to change input and out put mode Input 2V RMS 1K sinewave turn volume to 0dB measure preoutput level and THD Level 2V 0 1V...

Page 19: ...TONE_STB OPSEL_DATA OPSEL_CLK signal THE END Press Tone Key to change tone setting measure preout response YES Level 2V 0 1V THD 0 03 NO Check U109 U209 U111 U211 Check OPSEL_STB signal Press Z 2 reco...

Page 20: ...DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1 SYSTEM 11MHz CLOCK 2 AT89C51 reset is high active 3 6...

Page 21: ...3 volume control DATA and CLOCK 4 REC ZONE select DATA and CLOCK 3 7...

Page 22: ...5 Input select DATA and CLOCK 3 8...

Page 23: ...POWER SUPPLY ON PSU B603 B604 72V REGULATOR B606 ON PSU ISC CIRCUIT ON PSU D602 D603 L CHANNEL ON L AMP AMPLIFIER B605 20V REGULATOR B606 ON PSU PRE AMP ON PRE AMP BALANCE AMP ON BAL OUTPUT RELAYS L...

Page 24: ...B ATTENUATOR 10dB STEP BY PASS 40 60 80 100Hz PRE OUT1 PRE OUT2 INPUT SELECTOR BALANCE AMP DISC CD TUNER INPUT4 INPUT5 INPUT6 BALANCE 0 6 5dB SELECTABLE GAIN AMP STAGE 54dB ATTENUATOR 2dB STEP 5dB TON...

Page 25: ...RL91 standby relay PSU U84 U85 7400 FPP D81 Tri color LED FPP P4 0 P4 1 P4 2 P4 3 P4 4 P4 5 P4 6 P4 7 P5 0 P5 1 P5 2 P5 3 P5 4 P5 5 P5 6 P5 7 U108 U113 U208 U213 CD4094 PRE RL101 RL112 RL201 RL212 Fo...

Page 26: ...18 0 1uF V74 V74 72V 72V R301 470 AGND AGND AGND AGND GND GND C303 10uF 50V C304 10uF 50V C311 100UF 25V C312 100u 25V R335 10K R343 10K C316 0 1uF C317 0 1uF C309 0 1uF C310 0 1u 80V AGND AGND Q326 2...

Page 27: ...L GND V IN1 NO1 U104 MAX4621 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 COM1 COM2 NO2 IN2 V VL GND V IN1 NO1 U107 MAX4621 R1001 27 4 R1002 28 0 6 5 7 U102B AD8512ARZ 1D13 1N4148 1D14 1N4148 1R90 1M 1R91 1...

Page 28: ...F901 120V 100MA 250V F902 120V 5A 250V 1 2 3 4 CZ902 CON4 1 2 JP906 120V 1 2 JP907 230V 1 2 JP908 120V 1 2 3 4 CZ908 CON4 1 2 JP900 120V 1 2 3 4 1 2 7 8 5 6 3 4 Standby R Core 10VA Transformer To two...

Page 29: ...LK HCLK VOLR_DATA FUNC VOLA HDATA VOLL_STB OPSEL_CLK 24VL 24VL 24VR 24VR RXD TXD 5V IR IN IR OUT TRIG TRIG OPSEL_CLK HCLK HDATA FUNC VOLR_STB VOLR_DATA VOLR_CLK VOLL_CLK VOLL_DATA VOLL_STB VOLA TONE O...

Page 30: ...R C812 10N R844 10K 5V GND 5V P1 5 CEX2 27 P1 4 CEX1 25 P1 3 CEX0 23 P1 2 ECI 22 P1 1 T2EX 21 P1 0 T2 19 P0 7 AD7 3 P0 6 AD6 5 P0 5 AD5 6 P0 4 AD4 9 P0 3 AD3 11 P0 2 AD2 12 P0 1 AD1 14 P0 0 AD0 15 VC...

Page 31: ...K R535 1K C537 160P D511 1N4148 Q517 2SA1312 Q527 2SC2983 Q532 2SC2983 Q518 2SA1312 Q519 2SA1312 L52 100uH Q521 2SA1312 Q520 2SA1312 Q533 2SC3324 Q534 2SC3324 D5121N4148 D5131N4148 D5141N4148 Q522 2SA...

Page 32: ...22n 250V C620 22n 100V C621 22n 100V R646 0 22 1W FS R647 0 22 1W FS R648 0 22 1 2W FS R649 0 22 1 2W FS C632 22n 100V C633 22n 100V C634 1000u 100V C635 1000u 100V R616 1K R617 1K R622 3R3 1 2W FS R6...

Page 33: ...R141 R144 R140 R142 R143 1C54 1C26 J201 1R76 1R77 1R75 R120 R121 R128 R122 R123 R124 R125 R126 R127 R129 C140 1R83 1C28 C142 1D12 1Q14 1Q28 1R101 2C48 1C48 2Q18 2Q14 U210 Q205 R214 R270 2C41 2C43 2C42...

Page 34: ...1 1C01 1R01 1D01 1Q02 1R04 1C04 C131 C130 C102 R103 RL101 R105 C121 R104 LRCA2 C103 C120 LRCA1 J208L R102 C101 R101 Top layer 1R52 R164 R264 2R106 1R32 1R27 R159 Q118 C113 R146 C109 1R28 Q119 R160 1R2...

Page 35: ...P604 C636 OP91 CB601 CB604 C666 C627 J602 HEATSINK B604 C621 C620 C622 D603 R648 R649 R647 R646 C618 C617 D601 R601 D604 R610 P601 P602 P603 B603 C623 J603 C601 R667 D617 B606 Q606 Q605 C632 Q601 TP60...

Page 36: ...10Q511 L51 Q529 C502 Q514 C551 Q59 C517 R532 R540 R558 C552 Q528 C546 C534 R564 Q54 R528D52 R531D55 C518 C540 CZ504 C520 C543 R550 C530 C525 R559 C556 C557 C555 C554 Q515 Q530 R562 R548 R570 R534 C526...

Page 37: ...0 C990 D991 Q991 C994 R991 C993 HS4 M3 B008 ENC VM1 0_pcb ER1 EC4 EC1 ER2 EC2 ECZ1 ER4 EC5 ES1 ER3 EC3 HS4 M3 B007 LSPK VM1 0_pcb C COYPRIGHT NAD ELECTRONICS HS4 M3 B007 RSPK VM1 0_pcb C COYPRIGHT NAD...

Page 38: ...VOLRDATA J81 FUNC HCLK VOLRSTB HDATA VOLLDATA OPSEL DATA OPSEL STB C824 U87 C814 R828 R829 R830 C821 R848 C835 C812 R846 Q87 Q85 R825R824 U84 R844 Q86 U85 R849 IRIN RXD PRO VOLA TONE R847 IROUT TXD ST...

Page 39: ...10 Standby board bottom STBB CZ902 C904 CZ908 C903 CON4 NAD M3 STBB BOARD VM1 0 C COYPRIGHT NAD ELECTRONICS C908 IC1 C907 C906 B902 C902 C905 B901 C901 Top layer Bottom layer 3 25...

Page 40: ...30V T3 15AL 250V NAD M3 STBT BOARD VM1 0 C COYPRIGHT NAD ELECTRONICS put the jumper on those designator marked as 230V put the jumper on those designator marked as 120V Version select C version Versio...

Page 41: ...25 Q317 R388 R331 R335 Q313 R389 R330 IC301 R332 R333 R395 C311 R334 D302 Q354 R344 R396 VR301 C312 B301 D321 R321 R301 R326 D305 D306 R323 R327 C323 D320 C318 IC304 R376 R377 R37 R387 R313 Q302 P304...

Page 42: ...89 R431 C428 VR401 R488 C411 Q417 Q413 R430 IC401 R433 R432 R435 Q456 R4A6 R4A3 D407 D408 Q426 D409 R463 C420 R464 R467 R4A5 D340 R4A2 R4A1 R462 C421 Q454 R461 R498 R466 R497 R495 R434 B401 2005 C COP...

Page 43: ...1 MQ110 MQ112 MQ111 MR110 MC107 MR109 MR117 MC106 MQ103 MQ101 MQ111 MC109 MR118 MQ115 MQ110 MQ112 MQ103 MC112 MR110 MR118 MC109 MQ115 MD109 MD110 MC107 MP101 MR109 MR117 MC106 MD109 MD110 MC111 MD107...

Page 44: ...C511 C512 0805 4 2 06 10031 02 Chip Alu Electrolytic Capacitor 2 4 5 5 5 3 5 C 4 3 5 C 0 2 V 5 3 F u 0 1 2 06 33011 04 Chip Alu Electrolytic Capacitor 2 4 5 3 6 7 5 5 C 6 5 5 C 0 2 V 6 1 U 3 3 RESISTO...

Page 45: ...2 26 10251 11 Ceramic Chip Capacitor 1nF 50V 5 C810 C833 C834 C835 C836 C837 0805 6 2 26 10351 01 Ceramic Chip Capacitor 10nF 50V 5 C812 0805 1 2 26 10451 01 Ceramic Chip Capacitor 0 1uF 50V 80 20 C81...

Page 46: ...FUSE 100mA F901 1 PCB 2 16 53007 01 STANDBY PCB FR 4 1 6mm 165mm 48mm 1 2 94 048005 0 Warning Label 10 YELLOW PCB 2 2 1 P N 01 50307 02 STANDBY BOARD BOTTOM DIODE 2 33 30112 00 Diode Bridge DF1501S B9...

Page 47: ...V 5 C320 Pitch 5mm 1 2 25 22361 05 Metallized Polyester Film Capacitor 22nF 63V 5 C340 Pitch 5mm 1 2 25 10412 10 Metallized Polyester Film Capacitor 0 1uF 100V 10 C316 C317 C322 C323 Pitch 7 5mm 4 2 2...

Page 48: ...lm Resistor 220K 1 4W 5 R350 R376 Pitch 10mm 2 2 07 20105 10 Metal Film Resistor 1M 1 4W 5 R352 R354 Pitch 10mm 2 2 07 30108 10 Oxidized Film Resistor 0 1 1W 5 R3B1 R3B2 R3B3 R3B4 R3B5 R3B6 R3B7 R3B8...

Page 49: ...8 Pitch 7 5mm 1 2 25 10412 10 Metallized Polyester Film Capacitor 0 1uF 100V 10 C422 C423 C416 C417 Pitch 7 5mm 4 2 25 10561 02 Metallized Polyester Film Capacitor 1uF 63V 5 C427 C429 Pitch 5mm 2 2 06...

Page 50: ...30 R438 Pitch 10mm 2 2 07 30820 00 Oxidized Film Resistor 82 1 2W 5 R409 R423 Pitch 10mm 2 2 07 30331 11 Oxidized Film Resistor 330 1 2W 5 R432 R441 Pitch 10mm 2 2 07 30339 11 Oxidized Film Resistor 3...

Page 51: ...C769 Pitch 5mm 10 2 06 10012 00 Alu Electrolytic Capacitor 10uF 100V 20 C642 C742 C643 C743 Pitch 5mm 4 2 06 22051 00 Alu Electrolytic Capacitor 22uF 50V 20 C654 C655 C754 C755 Pitch 5mm 4 2 06 22012...

Page 52: ...210 00 Connector 10PIN CZ603 CZ703 CB10 2 2 17 07102 00 AC INLET GSP1 9500 1 R 30190 2PIN AC INLET 1 SWITCHES 2 11 01101 03 Power Switch RF 1003 BB2 S1 POWER2 1 AC FILTER 2 22 00010 00 EMI FILTER 250V...

Page 53: ...42 0805 6 2 26 10351 01 Ceramic Chip Capacitor 10nF 50V 10 1C23 2C01 2C03 2C05 2C07 2C09 2C11 2C13 2C15 2C17 2C19 2C21 0805 12 2 26 10451 01 Ceramic Chip Capacitor 100nF 50V 80 20 1C24 1C25 1C33 1C34...

Page 54: ...R276 0805 2 2 07 90472 01 Chip Resistor 4K7 5 1R23 2R01 2R02 2R03 2R04 2R05 2R06 2R07 2R08 2R09 2R10 2R11 2R12 2R13 2R14 2R15 2R16 2R17 2R18 2R19 2R20 2R21 2R22 2R23 0805 24 2 07 95101 01 Chip Resist...

Page 55: ...5 3 4 4 07 90221 01 Chip Resistor 220 5 MR109 MR114 MR118 0805 3 4 4 07 90223 01 Chip Resistor 22K 5 MR117 0805 1 4 4 07 90333 01 Chip Resistor 33K 5 MR101 0805 1 4 4 07 90100 05 Chip Resistor 10 1 2W...

Page 56: ...1 Chip Resistor 10M 5 1R24 1R25 1R26 1R27 1R28 1R29 1R30 1R31 1R32 1R33 1R34 1R35 1R36 1R37 1R38 1R39 1R40 1R41 1R42 1R43 1R44 1R45 1R46 2R24 2R25 2R26 2R27 2R28 2R29 2R30 2R31 2R32 2R33 2R34 2R35 2R3...

Page 57: ...pacitor 0 1u 100V 20 Pitch 7 5mm 2 1 A07 10229 10 Carbon Film Resistor 2 2 1 4W 5 Taping 2 1 32 28042 00 Ground tap GND 8 4 TRANSFORMER AC CORD 1 18 53231 01 MAIN TRANSFORMER TORIOD TI 043813 AU ISS 7...

Page 58: ...shing KG 010N 260mm 1 7 1 76 048012 0 PC COVER PC T 0 30 Clear Standby Board TOP 1 FASTENERS 1 61 023106 0 Self Taping Screws STB3 6 Back board 2 2 1 61 023206 0 Self Taping Screws BTB3 6 critesistor...

Page 59: ...48002 0 Serial No Label 53 10mm 6 1 94 048003 0 Barcode Label C version 117 155mm C 2 1 94 048004 0 Barcode Label AH version 117 155mm AH 2 1 94 048006 0 Barcode Label CH version 117 155mm BC 2 1 94 0...

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