NAD M25 C Service Manual
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NAD M25 C Service Manual

Seven channel amplifier
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© NAD 2005
M25 C/AH
NAD ELECTRONICS INTERNATIONAL
SEVEN CHANNEL AMPLIFIER
TORONTO

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Summary of Contents for NAD M25 C

  • Page 1 © NAD 2005 M25 C/AH NAD ELECTRONICS INTERNATIONAL SEVEN CHANNEL AMPLIFIER TORONTO...
  • Page 2 CONTENTS FRONT PANEL/REAR PANEL VIEW SPECIFICATIONS ALIGNMENT PROCEDURE/ALIGNMENT POINTS WIRING DIAGRAM SCHEMATIC DIAGRAM 8-16 PCB LAYOUT 17-23 ELECTRICAL PARTS LIST 24-40 EXPLODED VIEW 41-44 EXPLODED VIEW PARTS LIST PACKING DIAGRAM SERVICE SAFETY PRECAUTIONS 1. Replacing the Fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE.

  • Page 3: Front Panel Controls

    FRONT PANEL / REAR PANEL VIEW FRONT PANEL CONTROLS 1. POWER SWITCH 3. SOFT CLIPPING INDICATOR 2. POWER INDICATOR 4. PROTECTION INDICATOR 1. AC INLET 6. 12V TRIGGER INPUT 2. INPUT JACK 7. SOFT CLIPPING SWITCH 3. LEVEL CONTROL 8. MAINS FUSE 4.

  • Page 4: Specifications

    SPECIFICATIONS CONTINUOUS AVERAGE POWER 160 W (22.0 dBW) OUTPUT INTO 8 OHMS OR 4 OHMS (Min. power per channel, 20 Hz – 20 kHz, both channels driven, with no more than rated distortion) Rated Distortion 0.03% (THD 20 Hz – 20 kHz) Clipping power 180 W (maximum continuous power per channel).

  • Page 5: Alignment Procedure

    ALIGNMENT PROCEDURE A. THERMAL SENSE ADJUSTMENT This adjustment should be always done when the M25 is cool condition. (That means the temperature inside the unit should be almost same as the ambient temperature. Connector P208B that connects the transformer and power board should be removed to avoid that the Idling current heats up the unit excessively) At ambient temperature of 25 C degrees and when the unit is just turned on (still in cool condition), adjust the pot RV103(as marked as “Thermal Sense ADJ”...
  • Page 6 for example, all 7 channels at 50W/4ohms for 10 minutes or 5 minutes or even less (as long as the fan can starts turning). Turn off the signal but still keep the unit operating for 1 minute. Then run all 7 channels at 1kHz, 0.25W at 4 ohms load, monitor the voltage at TP1 of Pot RV201.

  • Page 7: Wiring Diagram

    WIRING DIAGRAM P101A P101A 1 P101A P101A 1 P101A P101A 1 P101A P101A 1 SC NPN P101A P101A 1 SC NPN SC NPN SC NPN P101A P101A 1 SC NPN SC NPN P101A P101A 1 SC NPN SC PNP SC PNP SC PNP SC PNP SC PNP...

  • Page 8: Schematic Diagram

    SCHEMATICS DIAGRAM R1E1 R1E1 +12V 3.3K 3.3K F101 F101 D135 D135 +62V +62V T6.3AL/250V T6.3AL/250V R1E2 R1E2 1N5404 1N5404 ISCTRIG R1A7 R1A7 -12V D131 D131 D132 D132 R1A3 R1A3 OFFSET OFFSET 0.05 0.05 470K 470K BAV21 BAV21 Q145 Q145 4.7V 4.7V /1/2W R1A8...

  • Page 9: Schematic Diagram

    SCHEMATICS DIAGRAM +12V -12V D107 D107 CNI6 CNI6 D106 D106 R1N5 R1N5 C139 C139 R169 R169 R1H1 R1H1 D110 D110 R172 R172 100nF 100nF /250V +68V CNI8 CNI8 R1N1 R1N1 4.7uF 4.7uF 4.7K 4.7K +68V BAV21 BAV21 47pF 47pF /1KV IC101 IC101 220K...
  • Page 10 SCHEMATICS DIAGRAM F201 F201 G2G1 G2G1 LM7812CT LM7812CT T1.6AL/250V T1.6AL/250V IC201 IC201 +12VD Ground Solder Tap Ground Solder Tap +18V +18V BR201 BR201 R2H1 R2H1 +18V C202 C202 DB104G DB104G C204 C204 Q205 Q205 3300uF 3300uF /35V R213 R213 10nF 10nF C206 C206...
  • Page 11 SCHEMATICS DIAGRAM +5VD R343 R343 R344 R344 STANDBY LED Q329 Q329 Q330 Q330 2SA1015 2SA1015 2SC1815 2SC1815 D308 D308 R347 R347 STBYLED is +0.7V at normal working condition and is +5V at STNADBY mode. R345 R345 PROT1-PROT7 each is +10.5V at normal working condition.When any BL-BJLB4274 BL-BJLB4274 channel is in protection,the relevant PROT will be at -10.5V.
  • Page 12 SCHEMATICS DIAGRAM SCLED SCLED R405 R405 SCP_4 SCP_4 D401 D401 R401 R401 +62V_4 +62V_4 R409 R409 /1/2W C401 C401 10uF 10uF C402 C402 10uF 10uF D402 D402 R402 R402 R410 R410 -62V_4 -62V_4 /1/2W R406 R406 SCN_4 SCN_4 SCP_3 SCP_3 R407 R407 D403...
  • Page 13 SCHEMATICS DIAGRAM P503B P503B P501B P501B LIVE W501 W501 TR501 TR501 10mm JUMPER 10mm JUMPER PCFS250L PCFS250L ONLY USED FOR C VERSION 2PIN2.54-C 2PIN2.54-C TO POWER SWITCH BOARD W502 W502 C501 C501 100nF/275V 100nF/275V 7.5mm JUMPER 7.5mm JUMPER P506B P506B ONLY USED FOR AH VERSION P502B P502B...
  • Page 14 SCHEMATICS DIAGRAM P601B P601B P601B1 P601B1 FLAT CONNECTOR SMD16 FLAT CONNECTOR SMD16 FLAT CONNECTOR SMD16 FLAT CONNECTOR SMD16 P603B P603B CONTACTS UPSIDE CONTACTS UPSIDE CONTACTS UPSIDE CONTACTS UPSIDE JST2.0-10C SMD JST2.0-10C SMD P618A P618A STBY P604B P604B P605B P605B P606B P606B P607B P607B...
  • Page 15 SCHEMATICS DIAGRAM S801 S801 P801A P801A SDDLB1027U-RN SDDLB1027U-RN 2P2.54-A100B 2P2.54-A100B - 15 -...
  • Page 16 Toroid Audio Ltd P/N: TI-043810 AU Iss 2 Diameter <162mm Center filled and 10mm hole Height <106mm NAD: M25 Weight <10.8Kg Thermal Autoreset 120Deg Comments: Class B insulation system (E202144/Z125) 1)Primary resistance:2x0.36ohm cULus logo + E115159 CE Logo 2)Secondary resistance:2x(0.065+0.03) and 2x(1.1+0.44)ohm...

  • Page 17: Acoff

    PCB LAYOUT AMP BOARD - COMPONENT SIDE R1G1 Q130 IC101 IC102 Q131 Q126 L101 Q145 CB101 C123 R1E2 R156 Q128 Q132 Q135 Q133 Q129 Q134 R1E3 CNI9 CNI8 C142 C162 R177 C125 CNI6 R161 C157 R160 R159 R158 CNI7 C158 R1N7 R1N8 BUS101...

  • Page 18: Pcb Layout

    C238 C239 C237 C220 C218 C214 C225 C227 C232 R2H2 R2H3 D235 BR208 D236 C255 C276 R2H4 C277 D233 D234 C290 NAD M25 THX SEVEN CHANNEL AMPLIFIER DESIGNED BY:HANSONG M25 TEAM 2005/08/08 PSU BOARD - SOLDER SIDE - 18 -...
  • Page 19 PCB LAYOUT CONNECTION BOARD - COMPONENT SIDE P601B P602B P603B BUS601 BUS604 BUS602 BUS605 BUS603 BUS606 STBY DGND SCLED SCN_3 P619B P620B SCN_4 VM1.0 2005/08/08 SCP_3 M25 CONNECTION BOARD SCP_4 +62V_3 -62V_3 +62V_4 -62V_4 CONNECTION BOARD - COMPONENT SIDE - 19 -...
  • Page 20 PCB LAYOUT DISPLAY BOARD - COMPONENT SIDE Q331R346 Q329 R344 C301 R349 R308 Q301 R322 R309 Q302 R323 R310 Q303 R324 R311 Q304 R325 R312 Q305 R326 R313 Q306 R327 R314 Q307 R328 D308 R343 D312 Q333 R301 R315 Q315 R302 R316 Q316 R303 R317 Q317 R304 R318 Q318 R305 R319...
  • Page 21 PCB LAYOUT TRIGGER BOARD - COMPONENT SIDE M25 SOFTCLIPPING&TRIG BOARD S402 S401 R411 R409 R402 R407 R405 R406 R403 C404 C403 P401B R401 D403 D401 R410 D402 R404 R413 J401 R408 VM1.0 2005/08/08 C402 R412 C401 D404 TRIGGER BOARD - SOLDER SIDE - 21 -...
  • Page 22 PCB LAYOUT SW BOARD - COMPONENT SIDE SW BOARD - SOLDER SIDE - 22 -...
  • Page 23 PCB LAYOUT STANDBY BOARD - SOLDER SIDE STANDBY BOARD - COMPONENT SIDE P503B P506B D501 W505 ONLY FOR C VERSION W503&W504 ONLY P504B FOR AH VERSION RL501 TR501 P505B C501 W501 ONLY USED FOR C VERSION W502 ONLY USED FOR AH VERSION P502B P501B - 23 -...

  • Page 24: Electrical Parts List

    ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT AH P/N 01-52501-10 C/BC P/N 01-52501-20 PCB1 BOARD (AMP) DIODE D100 Switch Diode 1N4148 33-44148-02 DAX/.300X.080/.031 D101 Switch Diode 1N4148 33-44148-02 DAX/.300X.080/.031 D102 Switch Diode 1N4148 33-44148-02 DAX/.300X.080/.031 D103 Switch Diode 1N4148 33-44148-02 DAX/.300X.080/.031...
  • Page 25 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT Q119 Transistor 2SA1015-GR 31-01015-00 TO92/100/ECB Q120 Transistor 2SA970-GR 31-00970-00 TO92/100/ECB Q121 Transistor 2SA970-GR 31-00970-00 TO92/100/ECB Q122 Transistor 2SA970-GR 31-00970-00 TO92/100/ECB Q123 Transistor 2SA1360-O 31-01360-00 TO126/90/ECB Q124 Transistor 2SC3423-O 31-03423-00 TO126/90/ECB Q125 Transistor 2SC2240-GR...
  • Page 26 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R122 Metal Film Resistor 100Ω, 1/6W, 5% 07-20101-00 AX/.200X.080/.031 R123 Metal Film Resistor 100Ω, 1/6W, 5% 07-20101-00 AX/.200X.080/.031 R124 Metal Film Resistor 10KΩ, 1/6W, 5% 07-20103-00 AX/.200X.080/.031 R125 Metal Film Resistor 1KΩ, 1/6W, 5% 07-20102-00 AX/.200X.080/.031...
  • Page 27 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R180 Metal Film Resistor 10KΩ, 1/6W, 5% 07-20103-00 AX/.200X.080/.031 R181 Metal Film Resistor 22KΩ, 1/6W, 5% 07-20223-00 AX/.200X.080/.031 R182 Metal Film Resistor 3K3Ω, 1/6W, 1% 07-23301-00 AX/.200X.080/.031 R183 Metal Film Resistor 220KΩ, 1/6W, 5% 07-20224-00 AX/.200X.080/.031...
  • Page 28 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT C106 Ceramic Capacitor 10pF, 5%, 1KV 05-10013-01 CPAX/.200X.100/.031 C107 Ceramic Capacitor 15pF, 5%, 1KV 05-15013-01 CPAX/.200X.100/.032 C108 Polyester capacitor 10nF, 10%, 63V 25-10361-04 RAD/.300X.150/LS.200/.031 C109 Ceramic Capacitor 22pF, 5%, 1KV 05-22013-02 CPAX/.200X.100/.032 ALU Electrolytic...
  • Page 29 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT ALU Electrolytic C151 06-10951-03 CPCYL/D.200/LS.200/.031 1uF/50V, 20%, 105 Capacitor C152 Polyester capacitor 1nF, 5%, 63V 25-10261-00 RAD/.300X.150/LS.200/.031 C153 Ceramic Capacitor 470pF, 10%, 1KV 05-47113-00 CPAX/.200X.100/.038 ALU Electrolytic C154 10uF/100V, 20%, 105 06-10012-01 CPCYL1/D.300/LS.200/.031 Capacitor...
  • Page 30 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT D207 Switch Diode 1N4148 33-44148-02 DAX/.300X.080/.031 D208 Switch Diode 1N4148 33-44148-02 DAX/.300X.080/.031 D209 Switch Diode 1N4148 33-44148-02 DAX/.300X.080/.031 D210 Zener Diode 8.2V, 1/2W 33-18209-01 DAX/.300X.080/.031 D211 Zener Diode 8.2V, 1/2W 33-18209-01 DAX/.300X.080/.031 D212...
  • Page 31 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT Q217 Transistor 2SD667-AWC 31-00667-00 TO92/100/ECB Q218 Transistor KSC2690AYSTU 31-02690-00 TO126/90/ECB Q219 Transistor KSC2690AYSTU 31-02690-00 TO126/90/ECB Q220 Transistor KSC2690AYSTU 31-02690-00 TO126/90/ECB Q221 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB Q222 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB Q223 Transistor 2SC1815-GR...
  • Page 32 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R231 Metal Film Resistor 10KΩ, 1/6W, 5% 07-20103-00 AX/.200X.080/.031 R232 Metal Film Resistor 10KΩ, 1/6W, 5% 07-20103-00 AX/.200X.080/.031 Metal Oxide Film R233 10KΩ, 1/2W, 5% 07-30103-00 AX/.400X.100/.031 Resistor Metal Oxide Film R234 10KΩ, 1/2W, 5% 07-30103-00...
  • Page 33 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R285 Metal Film Resistor 10KΩ, 1/6W, 5% 07-20103-00 AX/.200X.080/.031 R286 Metal Film Resistor 10KΩ, 1/6W, 5% 07-20103-00 AX/.200X.080/.031 R287 Metal Film Resistor 10KΩ, 1/6W, 5% 07-20103-00 AX/.200X.080/.031 R288 Metal Film Resistor 10KΩ, 1/6W, 5% 07-20103-00 AX/.200X.080/.031...
  • Page 34 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT ALU Electrolytic C214 06-33231-00 CPCYL1/D.900/LS.350/.062 3300uF/35V, 20%, 105 Capacitor ALU Electrolytic C215 06-10131-05 CPCYL1/D.300/LS.200/.031 100uF/35V, 20%, 105 Capacitor ALU Electrolytic C216 100uF/35V, 20%, 105 06-10131-05 CPCYL1/D.300/LS.200/.031 Capacitor ALU Electrolytic C217 06-47021-01 CPCYL1/D.300/LS.200/.031 47uF/25V, 20%, 105...
  • Page 35 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT ALU Electrolytic C255 2200uF/25V, 20%, 105 06-22221-04 CPCYL1/D.900/LS.350/.062 Capacitor C256 Polyester capacitor 10nF, 10%, 100V 25-10312-01 RAD/.300X.150/LS.200/.035 C257 Polyester capacitor 100nF, 10%, 100V 25-10412-02 RAD/.300X.150/LS.200/.037 C258 Polyester capacitor 10nF, 10%, 100V 25-10312-01 RAD/.300X.150/LS.200/.035 ALU Electrolytic...
  • Page 36 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT F203 Fuse T1.6AL/250V 20-12162-01 T1.6AL/250V F204 Fuse T1.6AL/250V 20-12162-01 T1.6AL/250V JUMPER W201 Jumper 10mm 21-06101-00 10mm W202 Jumper 10mm 21-06101-00 10mm W203 Jumper 20mm 21-10201-00 20mm BUS201 BUSBAR 69-046003-0 BUS202 BUSBAR 69-046002-0 BUS203...
  • Page 37 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT Q328 Transistor 2SA1015-GR 31-01015-00 TO92/100/ECB Q329 Transistor 2SA1015-GR 31-01015-00 TO92/100/ECB Q330 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB Q331 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB Q332 Transistor 2SA1015-GR 31-01015-00 TO92/100/ECB Q333 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB Q334 Transistor 2SD667-AWC...
  • Page 38 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT CONNECTORS BLKCON.079/VH/TM1SQ/W.200/ P302A Housing 1.0-11-16PS 13-21016-06 P/N 01-52504-00 PCB4 BOARD ( TRIGGER) DIODE D401 Zener Diode 24V, 1/2W 33-12400-06 DAX/.300X.080/.031 D402 Zener Diode 24V, 1/2W 33-12400-06 DAX/.300X.080/.031 D403 Zener Diode 24V, 1/2W 33-12400-06 DAX/.300X.080/.031...
  • Page 39 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT RL501 RELAYS 832A-1A-C-BH DC5V 12-03101-02 CONNECTOR P501B Jack PCFS250L 32-26304-10 P502B Jack HS4-CI9120-B009V1-M032 32-26304-00 BLKCON.100/VH/TM1SQB/W.200 P503B Housing 2PIN2.54-C 13-22502-00 BLKCON.156/VH/TM1SQB/W.355 P504B Housing 2PIN3.96-C 13-23902-00 BLKCON.295/VH/TM1SQ/W.200/ P505B Housing 4PIN7.5C 13-27504-00 BLKCON.100/VH/TM1SQB/W.200 P506B Housing 6PIN2.0-C...
  • Page 40 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT BUS605 Bus-bar 69-010002-0 BUS606 Bus-bar 69-010002-0 01-52507-00 PCB7 BOARD (POWER SWITCH) SWITCH S801 SWITCH SDDLB1027U-RN 11-01101-20 CONNECTOR P801A Connector 2P2.54-A150B 14-97302-11 XHB-2.5A-2Y Assembly Parts EFB1212L 35-01212-00 FUSE FUSE T20AL/250V(AH) 20-11203-10 FUSE T10AL/250V (C) 20-12103-20...

  • Page 41: Exploded View

    EXPLODED VIEW A002 A001 S005 S002 A004 A003 A005 S003 A007 A009 A006 S008 A010 A008 S007 S006 S001 S004 - 41 -...
  • Page 42 EXPLODED VIEW TR03 S009 TR02 TR04 S011 TR01 S012 S010 Insulator TR05 - 42 -...
  • Page 43 EXPLODED VIEW C002 S007 S005 C003 C012 C006 C004 C005 S007 C011 C010 S015 S016 C009 C001 S018 S017 C011 C008 C007 S013 S014 - 43 -...
  • Page 44 EXPLODED VIEW T001 T002 S028 F001 S020 F002 S019 S022 C015 S013 C013 F005 S023 F006 C014 R001 S027 S016 F009 F008 S017 F007 S021 S013 S013 F004 S023 F003 TR01 S007 S017 S026 S024 R005 C016 R004 S005 S007 S017 C005 C001...

  • Page 45: Exploded View Parts List

    EXPLODED VIEW PARTS LIST REF.NO PART NO. DESCRIPTION Qty. REF.NO PART NO. DESCRIPTION Qty. A001 70-046001-0 Main Heatsink F007 11-01101-20 SWITCH A002 01-52510-10 AMP MODULE PCB Boards(AH) F008 01-52503-00 PROTECT&SOFTCLIPPING LED BOARD 01-52510-20 AMP MODULE PCB Boards(C) F009 75-062001-0 Sleeve A003 67-046011-1 Terminal Bracket...

  • Page 46: Packing Diagram

    PACKING DIAGRAM REF.NO PART NO. DESCRIPTION Qty. 88-046002-0 Shipping Carton Box 88-046001-0 Gift Carton Box 89-046001-1 M25 Botton Polyfoam 00-52500-20 M25 Unit 87-046002-0 Non-woven Cloth bag 90-010003-0 polyfbag 89-046002-0 M25 Top Polyfoam 88-043003-0 M15Accessories Box 30-45250-00 Instruction Manual 88-043004-0 M15Box Sheet 15-10230-20 AC Cord - 46 -...

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