NAD M27 Service Manual Download Page 2

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TABLE OF CONTENTS

DESCRIPTION

P A G E

SERVICE CAUTION…………………………………………………………....3-4

SPECIFICATIONS………………………………………………………….... 5

WIRING DIAGRAM…………………………………………………………….....6

BLOCK DIAGRAM…………………………………………………….. ….......7-9

………………………………………………..…......12-25

PCB LAYOUT………………………………………………………………..26-33

ELECTRICAL PARTS LIST…………………………………………...

EXPLODED VIEW…………………………………………………………

60-63

EXPLODED VIEW PARTS LIST……………………………………………....64

CIRCUIT DIAGRAMS

TROUBLE SHOOTING A GUIDE…………………......................................10

TROUBLE SHOOTING B GUIDE…………………......................................11

Summary of Contents for M27

Page 1: ...NAD SERVICE MANUAL M27 SEVEN CHANEL M27 SEVEN CHANEL AMPLIFIER AMPLIFIER...

Page 2: ...ICE CAUTION 3 4 SPECIFICATIONS 5 WIRING DIAGRAM 6 BLOCK DIAGRAM 7 9 12 25 PCB LAYOUT 26 33 ELECTRICAL PARTS LIST 9 5 4 3 EXPLODED VIEW 60 63 EXPLODED VIEW PARTS LIST 64 CIRCUIT DIAGRAMS TROUBLE SHOOTI...

Page 3: ...NENTS 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 PROTRUNI...

Page 4: ...Parts 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 component...

Page 5: ...80W ref rated THD 20Hz 20kHz all channels driven THD N 250mW to rated power CCIF IMD DIM 100 0 005 ref 20Hz 20kHz IHF Dynamic Power 8 Ohms 4 Ohms 2 Ohms 320W 700W 650W Signal Noise Ratio A weighted 98...

Page 6: ...6...

Page 7: ...TOUCH TRIGGER IIC Analog Input unbalanced balanced 100 120VAC 220 240VAC STB PSU 5V MAIN PSU VB VDR VAUX LDO AC ENABLE 3V3 Regulated supply LM317 LM337 17 5V Regulated supply LM317 LM337 14 5V Clippi...

Page 8: ...MX is not set 2 RE3 is only available when MCLR functionality is disabled 3 OSC1 CLKIN and OSC2 CLKOUT are only available in select oscillator modes and when these pins are not being used as digital I...

Page 9: ...T COMPARATOR ENABLE LEADING EDGE BLANKING THERMAL SHUTDOWN DRAIN D REGULATOR 5 85 V BYPASS PIN UNDER VOLTAGE 1 0 V VT ENABLE UNDER VOLTAGE EN UV Q 115 A 25 A LINE UNDER VOLTAGE RESET AUTO RESTART COUN...

Page 10: ...Pow er key Logo led turn w hite YES change STB board Check PWMsignal YES Logo led turn off Logo led turn red YES NO YES Check PSU board VB VAUX VDR RIGHT NO Check STB board STB 3V RIGHT YES Change PS...

Page 11: ...00 U505 circuit YES Check Q500 Q502 Q508 circuit Change NC400 OEMBOARD Apply 1khz sinew ave to DUT Amplifier output correct YES NO INC INH signal correct YES Change NC400 OEMBOARD check 14 5V 5V Right...

Page 12: ...ND VDR VDR 17 5V 17 5V R279 0R GPI5 R281 0R AudioS 5VS VCLIP5 R274 47K GND C160 10N C161 10N GND GND R272 0R R273 0R 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31...

Page 13: ...R337 470 R342 3K 9 R 340 680 R334 22k R 335 22k GND 17 5V VAUX GND GND C 183 10U C 182 1U C 180 10U C 177 10U C 181 1U 1 2 3 D162 BAV99 1 2 3 D163 BAV99 GND C 184 10U GND GND GND GND PS _EN VAUX VAUX...

Page 14: ...M R576 309R R581 316R R580 3K24 R577 3K24 R572 3R3 R582 3R3 C532 100U 25V C551 100U 25V C533 100nZ C538 10U 25V C547 10U 25V C539 100nZ C548 100nZ C552 100nZ C540 10U 25V C543 10U 25V 17 5V 17 5V R567...

Page 15: ...12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 J3 CON_2x18MH VB GND GND VB VB OUTC OUTC OUTH OUTH B N I B N I CLIP CLIP IOUT IOUT D29 BAS316 Mechanical Spacer ALU Spacer 3...

Page 16: ...330p GND L3 10u GND L1 1u 8A R23 4R7 C23 4n7 GND OUTC L5 33n L2 33n R13 2R2 R33 2R2 R16 100k R36 100k C19 470n C30 470n D5 2V4 D13 2V4 R8 33k 1 J8 Mounting Hole GND 1 J9 Mounting Hole GND R41 1R R7 1...

Page 17: ...2 R57 1k2 R74 1k2 R52 10k R84 10k R63 1k5 R72 1k5 R77 1k5 R60 1k5 R56 2k7 R80 2k7 R50 3k R85 3k R49 820R R86 820R C47 1n8 C48 1n8 C52 1n8 C53 1n8 R76 47k R59 47k R65 1k8 GND C50 2n2 R78 360k R79 360k...

Page 18: ...IN0 VREF ICSPCLK 18 RA0 AN0 C1IN ICSPDAT ULPWU 19 Vss 20 RA4 AN3 T1 G OSC2 CLK OU T V DD RA5 T1 CKI OSC1 CLKIN RA3 M CLR V PP RC5 CCP1 P1A RC4 C2OU T P1B RC3 AN7 C12IN3 P1C RC6 AN8 S S RC7 AN9 SDO RB7...

Page 19: ...3 1 4 C M O D 1 5 G PO 2 1 6 U 101 C Y 8CM BR 204 4 C111 10 0 N C110 10 U V CC GN D R132 0 R318 0 R154 0 GN D GN D GN D GN D R311 0 GN D GN D C17 4 2 2 N F GN D CS0 R11 8 10K R155 5 6 0 GN D GPO GPO 5...

Page 20: ...n SchDoc PVBUS PVAUX ACDET VB VB VDR VDR VAUX VAUX nFATAL nAMPON 5VSB AMPOFF PSEN PSVAUX OVL PVSTART Sheet4 Main SMPS SchDoc PVBUS PSVAUX 5VSB Sheet3 Standby SMPS SchDoc 1 2 3 4 5 6 J2 B06P VL S 1 2 3...

Page 21: ...BC807W P R108 10k D41 BAS316 D40 BAT54J P R109 10k D34 BAS316 R90 1k 1 2 3 4 TR1 2mH 8A PVSTART P C5 1000u C6 1000u 1 2 K2A 12V T44 BC856BW R113 100k R114 100k R116 390k T41 BC846BW R106 100k R111 100...

Page 22: ...7 R17 10R T5 FDP61N20 8 9 TR4E TCT15 1 2 3 D21 BAW56W R41 1k T20 BC807 R40 10R T3 FDP61N20 R39 68R R42 68R C54 220p R18 68R R28 68R C43 220p 13 12 TR4G TCT15 1 2 3 D5 BAW56W R11 1k T11 BC807 R10 10R T...

Page 23: ...u P R62 1k R53 1k R75 18k P C64 470p P R87 1k2 P R88 2k2 D30 BAS316 R77 47k P R52 47k P C65 1u R89 47k C67 1n T32 BC856BW R76 47k P R71 1k R82 1k D26 BAS316 C58 1u R67 1M R73 1M P P T27 BC856BW T23 BC...

Page 24: ...to L Profile Mechanical M3x16 Mechanical M3x16 Mechanical Springwasher M3 Mechanical Springwasher M3 Mechanical M3 Mechanical M3 Mechanical 3x5x10mm Mechanical 3x5x10mm FETs Diodes to Heatsink Mechan...

Page 25: ...omment 10UH C304 1000uF 10V CY301 1nF AC250V C306 100nF 50V C305 100nF 50V OP301 PC817 BP 2 S 5 S 6 D 4 UV 1 S 7 S 8 IC301 TNY274 R306 100R C308 100nF 50V 2 3 1 IC302 TL431 R309 2 2K 1 R308 10k R307 1...

Page 26: ...1 MCU BOARD 26 PCB LAYOUT TOP Layer Bottom Layer...

Page 27: ...27 2 REGULATED SUPPLY BOARD Top Layer Bottom Layer...

Page 28: ...28 3 AMP BOARD Top Layer Bottom Layer...

Page 29: ...29 4 NC400 OEM BOARD Bottom Layer Top Layer...

Page 30: ...30 5 TRIGGER BOARD Top Layer Bottom Layer6 6 TOUCH BOARD7 7 LED BOARD Top Layer Bottom Layer Bottom Layer Top Layer...

Page 31: ...31 8 SMPS BOARD Bottom Layer Top Layer...

Page 32: ...32 9 SMPS STB BOARD 1 2 Bottom Layer Top Layer...

Page 33: ...33 9 SMPS STB BOARD 2 2 Bottom Layer Top Layer...

Page 34: ...0 0 1 3 5 3 1 Q 5 0 1 Q e p a T 3 2 T O S C A C 1 0 3 2 M P A T E F S O M H C P 1 0 1 0 3 2 0 1 3 2 3 1 Q D O M 6 3 2 O T F L 5 8 E T R G 2 1 3 1 A S 2 r o t s i s n a r T 0 0 2 1 3 1 0 1 3 7 1 1 Q 4...

Page 35: ...i s e R p i h C 0 0 1 0 0 1 9 7 0 6 7 1 R 0 0 1 R 1K 0603 1 10W 1 RC0603FR 071KL r o t s i s e R p i h C 0 0 1 0 5 7 9 7 0 0 8 1 R 7 5K 0603 1 10W 1 RC0603FR 077K5L K 9 3 r o t s i s e R p i h C 0 0...

Page 36: ...R m 5 2 0 5 0 1 S R L r o t s i s e R p i h C r O 4 4 1 R R209 R213 R230 R237 07 90101 10 Chip Resistor 100 5 R0603X4 K 0 1 T E N r o t s i s e R p i h C 0 1 3 0 1 0 9 7 0 0 9 1 R 9 8 1 R 4 5 0603 4 C...

Page 37: ...R 1 7 1 R 10 3362P 1 103LF 25mm 3260mm 3 85 000002 0 Moveable Bushing KG 010N 260mm N 3 6 S G S G 1 1 4 5 2 M T N C n i P t s e T 2 2 1 0 0 0 1 3 1 1 P T A 4 P I S d e t a l p d l o G A 4 A 5 2 B H X...

Page 38: ...0 9 4 3 R 10K 0603 1 10W 1 RC0603FR 0710KL CAPACTIOR r o t i c a p a C p i h C c i m a r e C 1 0 1 5 0 7 4 6 2 9 7 1 C 8 7 1 C 47PJ 50V 0805 NPO C2012C0G1H470 JT C122 C132 C185 C186 26 10451 10 Ceram...

Page 39: ...A P O l a u D 1 0 2 7 0 0 0 3 0 2 0 5 U 8 O S 4 E 5 K 2 A U 4 3 1 2 A P O P M A P O l a u D 0 0 4 3 1 2 0 3 0 3 0 5 U N S E T 2 0 0 6 P C M P M A P O l a u D 1 0 2 0 0 6 0 3 0 4 0 5 U 0 0 7 1 3 0 0 3...

Page 40: ...o t s i s e r p i h C 1 0 0 0 0 1 9 7 0 6 8 5 R 100 0805 1 8W 1 RC0805FR 07100RL R501 R554 R555 R578 R579 R584 07 90101 01 Chip Resistor 100 0805 1 8W 5 RC0805JR 07100RL R514 R518 R521 R529 07 90103 0...

Page 41: ...6 2 6 2 5 C C530 C531 C534 C544 C545 C556 C571 26 10611 21 Ceramic Chip Capacitor 10uK 16V 0805 X5R C2012X5R1C106 KT CC0805KKX5R7BB106 C541 C549 C507 C511 26 10352 02 Ceramic Chip Capacitor 1206 10nF...

Page 42: ...R C S E D O N T R A P O N T I U C R I C A16 62203 21 NC400 OEM PCB VM1 0 FR 4 1 6mm 4 Laters Top Bottom 2oz Mid 1oz TG130 82 63mm DIODES B 0 1 Z D P W 4 0 V 0 1 e d o i D r e n e Z 3 0 0 0 0 1 1 3 3 8...

Page 43: ...9 0 0 2 8 9 7 0 6 8 R 9 4 R Professional MELF Resistors 820 1 MMU01020C8200FB300 R57 R58 R74 R75 07 91201 91 Professional MELF Resistors 1 2K 1 MMU01020C1201FB300 R60 R63 R72 R77 07 91501 91 Professi...

Page 44: ...0KL r o t s i s e R p i h C 0 0 2 0 2 1 9 7 0 1 5 1 R 5 4 1 R 12K 0603 1 10W 1 RC0603FR 0712KL r o t s i s e R p i h C 0 0 2 0 3 1 9 7 0 0 5 1 R 13K 0603 1 10W 1 RC0603FR 0713KL r o t s i s e R p i h...

Page 45: ...6 C68 26 10351 00 Chip Capacitor 10nK 50V 0603 X7R C2012X7R1H103 KT R 7 X 3 0 6 0 V 0 5 K 7 n 4 r o t i c a p a C p i h C 0 0 1 5 2 7 4 6 2 3 2 C 3 C 3 0 6 0 R 7 X V 0 5 Z n 0 0 1 r o t i c a p a C p...

Page 46: ...AL PARTS 67 355006 0 Amp Bracket SECC N5 T 1 6mm 65 355006 0 Amp Bracket SECC N5 T 1 6mm 67 355003 0A Amp Panel Cover SECC N5 T 1 6mm 80 355003 0 Amp Panel Cover SECC N5 T 1 6mm 65 355003 0 Amp Panel...

Page 47: ...6 3 5 3 X K C 0 9 m m 5 3 n o C 5 5 1 0 0 2 0 7 1 1 0 1 J 1 T 5 N C C E S l a n i m r e T B C P 0 1 0 0 4 1 1 7 6 2 B P 1 B P f g 0 6 1 m m 5 3 8 H 0 6 1 1 C L V 2 0 1 1 T I h c t i w S t c a T 0 3 1...

Page 48: ...4 D150 D163 D164 33 50603 06 SMD LED RED SML 310VTT86 Red D102 D156 D157 33 50603 90 SMD LED WHITE WR PB1608UW G M23 TRANSISTORS A K E 4 1 1 A T D r o t s i s n a r t l a t i g i D 1 0 4 1 1 0 0 1 3 4...

Page 49: ...20J E3 TR3 1 0 6 1 0 0 2 3 3 4 4 D 5 3 D 8 D Surface Mount Schottky Barrier Rectifier SS16 SMA D18 D19 D20 33 20220 01 Ultrafast Power Rectifier MURA220T3G 1 0 0 0 2 0 0 3 3 0 1 D Transient Voltage Su...

Page 50: ...4 R 5 1 R 220 0603 1 10W 1 RC0603FR 07220RL R95 R96 R100 07 91803 00 Chip resistor 180K 0603 1 10W 1 RC0603FR 07180KL R11 R13 R16 R19 R30 R36 R41 R53 R61 R62 R64 R71 R82 R90 R118 07 91001 00 Chip Resi...

Page 51: ...c a p a C p i h C c i m a r e C 0 0 1 2 4 2 2 6 2 1 7 C 4 4 C 220nK 25V 0603 X7R C1608X7R1E22 4KT C38 C43 C49 C54 C69 C72 26 22152 01 Ceramic Chip Capacitor 220pK 500V 0805 X7R 0805B221K501 NT HCM0805...

Page 52: ...0 2 2 J 5 R T A 5 4 1 7 8 8 8 C S r e m r o f s n a r T 1 0 7 8 8 8 0 2 2 A J 2 R T K L B m m 4 3 0 8 2 T C r o 0 5 3 1 e v i s e h d A M 3 0 2 0 2 0 0 0 6 8 2 R T K L B m m 6 1 0 8 2 T C r o 0 5 3 1...

Page 53: ...T P I R C S E D O N T R A P O N T I U C R I C A16 32708 21 SMPS STB 1 PCB VM1 0 FR 4 1 6mm 2 Layers 2oz TG130 DIODES V 0 0 6 A 8 0 S 6 B R E I F I T C E R E G D I R B 0 0 2 6 0 0 3 3 3 1 0 3 D R N W 8...

Page 54: ...1 0 1 6 2 9 0 3 C 100pJ 50V 0805 NPO C2012C0G1H10 1JT C305 C306 C307 C308 26 10451 01 Ceramic Chip Capacitor 100nZ 50V 0805 Y5V 0 0 2 4 0 0 1 6 0 1 0 3 C Alu Electrolytic Capacitor CD11H 10uF 400V 20...

Page 55: ...2 Y K l a n i m r e T B C P 6 0 8 0 3 6 2 2 3 2 0 4 P 1 0 4 P A14 32701 02 Wire UL1672 16AWG L 70mm 69 355004 0 Spacer H 55mm 78 355004 0 Insulator Sheet GK17 UL94V 0 T 0 4mm MISC AND MACHABICAL PART...

Page 56: ...ctor Bracket SECC N5 T 1 2mm 67 355005 0 Bracket Pitch SECC N5 T 1 2mm 65 355005 0 Bracket Pitch SECC N5 T 1 2mm 67 355007 0 PCB Guide Bracket SECC N5 T 1 0mm 65 355007 0 PCB Guide Bracket SECC N5 T 1...

Page 57: ...elf taping screw STB3 6 61 023208 0 Self Taping Screw BTB3X8 61 023506 0 Machine Screw MB3 6 63 010309 5 Plain Washer 3 9 5mm 61 023506 1 Machine Screw MB3 6 J61 234510 1 Machine Screws M4X10 61 02450...

Page 58: ...3mmX478mmX92 5mm 89 355003 0 Accessory Pulp 286mmX180mmX47mm 89 355004 0 Shoe Cover Pulp 118mmX111mmX14mm 88 355003 0A Cables Box 306mmX187mmX52mm 88 355004 0A Cleaning Cloth bag L160 W110 0 3 5 W 0 2...

Page 59: ...37 00200 01 USB Disk 30 49318 01 Quick Setup Guide 370X287mm JA15 16250 00 AC Cord LP 34 H05VV F 3 1 00mm2 6 BLK LS 60 or A15 10230 20 AC Cord T973 C JA15 16120 12 AC Cord LP 31 SJT 14 3C BLK L 1800 L...

Page 60: ...17 Binding Post Black 1x7 S005 61 023106 0 self screw STB3x6 2x7 S018 61 273308 1 Self Tapping Screw M2 9x18x8 2x7 S006 61 023208 0 self taping screw BTB3x8 4x7 S019 61 023212 0 self taping screw BTB3...

Page 61: ...sory Box Sheet 1 9 88 351006 0A accesory box 1 10 89 355003 0 Accessory Pulp 1 11 89 355004 0 Shoe Cover Pulp 1 12 J71 267903 0 Masters II Feet Shoe 4 78 267001 0 Feet PAD 4 13 30 43270 01 Instruction...

Page 62: ...81 02 0 Nylon Spacer 2 P007 85 3550 01 0 Threaded Spacer 1 S023 61 0635 06 1 M achine Screw M F3X6 4 S024 61 0635 08 1 M achine Screw M F3X8 4 S025 85 3200 02 0 Nylon screw M 3 12N 1 S026 61 0235 12 1...

Page 63: ...03 S006 C001 C002 C003 C004 C005 C006 C007 C008 C009 C010 C011 C012 C013 C014 C018 C015 C017 C016 S001 S001 S001 S002 S002 S002 S003 S003 S003 S003 S003 S004 S004 S004 S004 S005 S005 S005 S005 S005 S0...

Page 64: ...lf Taping Screws BTB3 6 8 C016 01 32708 00 SMPS STB 1 BOARD 1 S003 61 023506 0 Machine Screw M3 6 26 C017 01 32710 00 SMPS STB 2 BOARD 1 S004 61 023506 1 Machine Screw M3 6 Ni 8 C018 01 32709 00 Regul...

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