NAD 375BEE C Service Manual
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NAD 375BEE C Service Manual

Stereo integrated amplifier
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See also: Owner's Manual
C375BEE C/AH
STEREO INTEGRATED AMPLIFIER

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Summary of Contents for NAD 375BEE C

  • Page 1 C375BEE C/AH STEREO INTEGRATED AMPLIFIER...
  • Page 2 CONTENTS FRONT PANEL/REAR PANEL VIEW SPECIFICATIONS ALIGNMENT PROCEDURE/ALIGNMENT POINTS WIRING DIAGRAM SCHEMATIC DIAGRAM 9-18 PCB LAYOUT 19-27 ELECTRICAL PARTS LIST 28-48 EXPLODED VIEW EXPLODED VIEW PARTS LIST PACKING DIAGRAM VERSION HISTORY............52 SERVICE SAFETY PRECAUTIONS 1.
  • Page 3 module non-service-part - 3 -...

  • Page 4: Specifications

    SPECIFICATIONS PREAMPLIFIERS SECTION THD(2V in 2V out,CCIF IMD,DIM 100) < 0.004 % Signal/Noise IHF re 500mV output A wtd. > 102 dB re 2V output, max volume > 110 dB re 100mV o/p (unity gain) > 92 dB Channel separation 1KHz >...

  • Page 5: Alignment Procedure

    ALIGNMENT PROCEDURE A. DC OFFSET VOLTAGE The DC OFFSET between OFFSET Test Point and AGND must be within 0+/-20mV. B. IDLING CURRENT The idling current in the output stage of the poweramp should be set to 30mA+/-5mA per pnp-npn transistor pair (This means the mid point voltage is 6.6mV with down limit of 5.5mV and up limit of 7.7mV).
  • Page 6 ALIGNMENT PROCEDURE 2))6(7 7(67 32,17 ,6& 6(16 7(67 32,17 $*1' ,'/,1* &855(17 7(67 32,17 ,'/,1* &855(17 7(67 32,17 ,6& 6(16 $'- 59 ,'/,1* &855(17 $'- 59 - 6 -...
  • Page 7 ALIGNMENT PROCEDURE /()7 )5(48(1&< 5(63216( $'- 5,*+7 )5(48(1&< 5(63216( $'- /()7 0,1 /($.$*( $'- 5,*+7 0,1 /($.$*( $'- 59 59 - 7 -...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM TO P204B AC OUTLET AC OUTLET J701 J701 FROM PAD1-6 P701A P701A AC INLET AC INLET P901B P901B RS232 BOARD BINDING POST BOARD MAIN BOARD P205B P205B TO L&R P102B P203A P203A PAD6 PAD5 PAD2 PAD3 PAD4 PAD1 P204B P204B TO P901B...
  • Page 9 SCHEMATICS DIAGRAM POWER AMP SECTION Q101 Q101 R194 R194 KSC2690A KSC2690A +80V R172 R172 R173 R173 R174 R174 R175 R175 C141 C141 D127 D127 D128 D128 R140 R140 R141 R141 R153 R153 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 R184 R184 R189...
  • Page 10 SCHEMATICS DIAGRAM MAIN BOARD PREAMP & INPUT SELECT RCA201B RCA201B RCA201A RCA201A RL209A RL209A PHONO L PHONO R PREOUT1/2 LEFT +26V -26V AV6-8.4-13 AV6-8.4-13 AV6-8.4-13 AV6-8.4-13 RL201A RL201A R201 R201 R202 R202 RL201B RL201B MP R IN MP R IN LEFT RIGHT JRC-27F/012/S...
  • Page 11 SCHEMATICS DIAGRAM PSU (WITHOUT MDC +8.8V SUPPORT) HS201 HS201 HS202 HS202 Q203 Q203 R255 R255 R256 R256 MPSA92 MPSA92 R250 R250 P206B P206B BR201 BR201 BR202 BR202 70-004003-1 70-004003-1 R252 R252 70-004003-1 70-004003-1 KBU8D KBU8D KBU8D KBU8D FOR BR201&TH201 FOR BR202&TH202 P209A P209A TH201...
  • Page 12 SCHEMATICS DIAGRAM TONE CONTROL +5.6V C319 C319 C325 C325 C326 C326 C301 C301 220uF 220uF /25V 10uF 10uF 100nF 100nF C321 C321 R323 R323 R327 R327 R309 R309 100uF 100uF /16V 2.2K 2.2K C327 C327 2.2K 2.2K C303 C303 R317 R317 100nF 100nF...
  • Page 13 SCHEMATICS DIAGRAM STANDBY C405 C405 D402 D402 D404 D404 F401 F401 IC402 IC402 1N5819 1N5819 D409 D409 /Y Type 1N5822 1N5822 LM7805CT LM7805CT 1N4148 1N4148 T1AL/250V T1AL/250V +5.6VD R401 R401 C403 C403 TR402 TR402 10nF 10nF /X Type C406 C406 220uF 220uF /16V...
  • Page 14 SCHEMATICS DIAGRAM KEYBOARD AND DISPLAY IC501 IC501 C501 C501 100nF 100nF P2.7 SP232EEP SP232EEP IC503 IC503 P2.6 +5VD VOL- +5VD P0.7 P1.0/T2 C502 C502 100nF 100nF DGND VOL+ P0.0 P1.1/T2EX P0.0/AD0 T1OUT P1.2 P0.1 T1OUT P1.2 P0.1/AD1 C503 C503 R1IN P1.3 P0.2 100nF...
  • Page 15 01-37506-10 & 20 SCHEMATICS DIAGRAM R605 R605 R606 R606 Q603 Q603 Q604 Q604 2SA1312 2SA1312 2SA1312 2SA1312 C607 C607 Q605 Q605 Q606 Q606 C608 C608 R626 R626 2SC3324 2SC3324 100nF 100nF 2SC3324 2SC3324 100nF 100nF 150K 150K R625 R625 150K 150K R607 R607...
  • Page 16 SCHEMATICS DIAGRAM J701 J701 P701 P701 3PIN2.54-A100B 3PIN2.54-A100B R701 R701 DB9 FEMALE DB9 FEMALE P702B P702B 3PIN2.54-C 3PIN2.54-C - 16 -...
  • Page 17 SCHEMATICS DIAGRAM P801A P801A J801 J801 PHONE JACK PHONE JACK 3PIN2.54-A170B 3PIN2.54-A170B - 17 -...
  • Page 18 SCHEMATICS DIAGRAM BP901A BINDING POST P901B P901B BP901B BIND,1G POST BP901C BINDING POST 6PIN3.96-C 6PIN3.96-C BP901D BINDING POST - 18 -...

  • Page 19: Pcb Layout

    PCB LAYOUT C375BEE/C275BEE AMP BOARD - COMPONENT SIDE C375BEE/C275BEE PowerAMP Board VM1.0 Oct. 22. 2008 R170 CB102 R171 CB101 R164 G1G1 R172 R179 R173 R180 R174 R181 R163 R175 R182 C132 R1A1 C105 HS101 C156 R198 C144 C119 C118 Q133 Q137 Q131 Q132...
  • Page 20 PCB LAYOUT C375BEE MAIN BOARD - COMPONENT SIDE RCA201 S201 S202 J202 RV20 1 C269 C265 R248 C225 C226 R217 C217 R218 C215 C216 C213 R231 R232 R229 R230 C210 C208 R225 R226 R203 R204 C268 Q212 C271 C267 C266 PAD5 PAD3 PAD4...
  • Page 21 PCB LAYOUT C375BEE TONE BOARD - COMPONENT SIDE P301A RV307 C302 C304 C303 C301 C375BEE Tone Board VM1.0 C323 Oct. 28. 2008 C327 M301 C322 R321 RV305 C309 R317 R307 R312 R322 C321 C319 C315 RV306 C317 R327 BGND DGND R328 TONE +5V6...
  • Page 22 PCB LAYOUT C375BEE/275BEE STANDBY BOARD - COMPONENT SIDE C375BEE/275BEE Standby Board VM1.0 Oct. 28. 2008 D406 P402 P401 Pls cut HF115 2pins W403 W401 W402 when using it P403B RL401 TR402 P404B C406 R402 TR401 W404 D401 W405 C408 C401 C410 ATTENTION: IC401...
  • Page 23 PCB LAYOUT C375BEE DISPLAY BOARD - COMPONENT SIDE P504A IC506 X501 D504 C517 D506 D505 S511 IC504 J501 POWER D507 D508 D509 D510 D511 D512 D513 D514 D515 D516 S507 S509 S501 S502 S503 S504 S505 S506 S508 S510 TONE TAPE2 TAPE1 SP A...
  • Page 24 (Only replace Line In or Line Out modules, do not repair) PCB LAYOUT C375BEE/C275BEE Opamp BOARD - COMPONENT SIDE Q610 Q609 Line in module C611 is 39pF M201 01-37506-10 Line out module C611 is 47pF M301 01-37506-20 C375BEE/C275BEE Opamp BOARD - SOLDER SIDE - 24 -...
  • Page 25 PCB LAYOUT C375 RS232 BOARD R701 P701A - 25 -...
  • Page 26 PCB LAYOUT C375BEE HEADPHONE BOARD P801A J801 - 26 -...
  • Page 27 PCB LAYOUT C375BEE/C275BEE Binding Post Board - COMPONENT SIDE P901B C375BEE/C275BEE Binding Post Board VM1.0 Oct. 22. 08 C375BEE/C275BEE Binding Post Board - SOLDER SIDE - 27 -...

  • Page 28: Electrical Parts List

    ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT 01-37501-00 PCB1 BOARD (POWERAMP MODULE) DIODE D101 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031 D102 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031 D103 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031 D104 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031 D105 Switch Diode 1N4148...
  • Page 29 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT Q133 Transistor KSC2690AYSTU 31-02690-00 TO126/90/ECB Q135 Transistor KSC2690AYSTU 31-02690-00 TO126/90/ECB Q136 Transistor KSC2690AYSTU 31-02690-00 TO126/90/ECB Q137 Transistor KSA1220AYSTU 31-01220-00 TO126/90/ECB Q138 Transistor KSA1220AYSTU 31-01220-00 TO126/90/ECB Q139 Transistor 2SA2121-O J31-02121-00 TO264/215/BCE Q140 Transistor 2SA2121-O...
  • Page 30 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R127 Metal Film Resistor 10Ω, 1/6W, 5% 07-20100-50 AX/.200X.080/.031 R128 Metal Film Resistor 10Ω, 1/6W, 5% 07-20100-50 AX/.200X.080/.031 R129 Metal Film Resistor 10Ω, 1/6W, 5% 07-20100-50 AX/.200X.080/.031 R130 Metal Film Resistor 1KΩ, 1W, ±1% 07-21001-01 AX/.600X.125/.039...
  • Page 31 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R184 Metal Film Resistor 470Ω, 1/6W, 5% 07-20471-50 AX/.200X.080/.031 R185 Metal Film Resistor 47KΩ, 1/6W, 5% 07-20473-50 AX/.200X.080/.031 R186 Metal Film Resistor 22KΩ, 1/6W, 5% 07-20223-50 AX/.200X.080/.031 R187 Metal Film Resistor 2K2Ω, 1/6W, 5% 07-20222-50 AX/.200X.080/.031...
  • Page 32 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT C102 Polyester capacitor 100nF, ±5%, 250V 25-10422-01 RAD/CAP/.300X.150/LS.200/.031 C103 ALU Electrolytic Capacitor 06-10051-01 CPCYL1/D.200/LS.200/.031 10uF/50V, ±20%, 105 C104 Ceramic Capacitor 33pF, ±5%, 1KV 05-33013-02 CPAX/.200X.100/.031 C105 ALU Electrolytic Capacitor 06-10012-01 CPCYL1/D.300/LS.200/.031 10uF/100V, ±20%, 105 C107...
  • Page 33 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT C147 ALU Electrolytic Capacitor 10uF/50V, ±20%, 105 06-10051-01 CPCYL1/D.200/LS.200/.031 C148 Polyester capacitor 470nF, ±5%, 63V 25-47461-00 RAD/.300X.150/LS.200/.031 C149 Polyester capacitor 470nF, ±5%, 63V 25-47461-00 RAD/.300X.150/LS.200/.031 C150 ALU Electrolytic Capacitor 10uF/50V, ±20%, 105 06-10051-01 CPCYL1/D.200/LS.200/.031 C151...
  • Page 34 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT D227 RECTIFY DIODES 1N4007 33-24007-00 DAX/.400X.100/.039 D228 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031 D230 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031 D231 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031 BT151-500R TH201 Thyristor 33-60116-00 TO-220 BT151-500R TH202 Thyristor 33-60116-00...
  • Page 35 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R215 Metal Film Resistor 220Ω, 1/6W, 5% 07-20221-50 AX/.200X.080/.031 R216 Metal Film Resistor 220Ω, 1/6W, 5% 07-20221-50 AX/.200X.080/.031 R217 Metal Film Resistor 220Ω, 1/6W, 5% 07-20221-50 AX/.200X.080/.031 R218 Metal Film Resistor 220Ω, 1/6W, 5% 07-20221-50 AX/.200X.080/.031...
  • Page 36 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R271 Metal Film Resistor 1KΩ, 1/6W, 1% 07-21001-50 AX/.200X.080/.031 R272 Metal Film Resistor 1KΩ, 1/6W, 1% 07-21001-50 AX/.200X.080/.031 R273 Metal Film Resistor 2K2Ω, 1/6W, 5% 07-20222-50 AX/.200X.080/.031 R274 Metal Film Resistor 150KΩ, 1/6W, ±5% 07-20154-50 AX/.200X.080/.031...
  • Page 37 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT C212 Ceramic Capacitor 100pF, ±5%, 1KV 05-10113-04 CPAX/.200X.100/.031 C213 Ceramic Capacitor 100pF, ±5%, 1KV 05-10113-04 CPAX/.200X.100/.031 C214 Ceramic Capacitor 100pF, ±5%, 1KV 05-10113-04 CPAX/.200X.100/.031 C215 Ceramic Capacitor 100pF, ±5%, 1KV 05-10113-04 CPAX/.200X.100/.031 C216...
  • Page 38 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT C258 Polyester capacitor 100nF, ±5%, 250V 25-10422-01 RAD/.300X.150/LS.200/.034 C259 ALU Electrolytic Capacitor 06-10951-03 CPCYL1/D.200/LS.200/.031 1uF/50V, ±20%, 105 C260 ALU Electrolytic Capacitor 06-10111-07 CPCYL1/D.200/LS.200/.031 100uF/16V, ±20%, 105 C261 ALU Electrolytic Capacitor 330uF, ±20%, 16V, 105 06-33111-02 CPCYL1/D.300/LS.200/.031...
  • Page 39 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT RL210 RELAYS JRC-27F/012-S(555) 12-02101-02 RELAY_11 RL211 RELAYS JQX-115F/036/1HS1 A12-03101-04 RELAY_1 RL212 RELAYS JQX-115F/036/1HS1 A12-03101-04 RELAY_1 RL213 RELAYS JQX-115F/036/1HS1 A12-03101-04 RELAY_1 RL214 RELAYS JQX-115F/036/1HS1 A12-03101-04 RELAY_1 RV201 Stereo POT 1kΩB, RV142B-20-25A-B1K 09-02102-00 VRES20 CONNECTOR...
  • Page 40 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT Q304 Transistor 2SD667-D 31-00667-01 TO-92 RESISTOR R301 Metal Film Resistor 75KΩ, 1/6W, ±5% 07-20753-50 AX/.200X.080/.031 R302 Metal Film Resistor 75KΩ, 1/6W, ±5% 07-20753-50 AX/.200X.080/.031 R303 Chip Resistor 47Ω, ±5%,0805 07-90470-01 SM/R_0805 R304 Chip Resistor...
  • Page 41 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT C324 ALU Electrolytic Capacitor 06-10021-04 CPCYL1/D.300/LS.200/.031 10uF, ±20%, 50V, 105 C325 ALU Electrolytic Capacitor 06-10021-04 CPCYL1/D.300/LS.200/.031 10uF, ±20%, 50V, 105 C326 Polyester capacitor 100nF, ±5%, 63V 25-10461-07 RAD/CAP/.300X.150/LS.200/.031 Bi-polarized Alu C327 4.7uF,50V,±20%, 85 06-47951-04...
  • Page 42 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT C402 ALU Electrolytic Capacitor 10uF,400V,±20%, 105 06-10042-00 CPCYL1/D.400/LS.200/.031 C403 X Capacitor 10nF/275V, ±10% A25-10322-05 RAD/CAP/.400X.200/LS.400/.031 C404 Polyester capacitor 100nF, ±5%, 63V 25-10461-07 RAD/CAP/.300X.150/LS.200/.031 C405 Y Capacitor 1nF, Y Type A05-10242-00 RAD/CAP/.400X.200/LS.400/.031 C406 ALU Electrolytic Capacitor...
  • Page 43 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT D514 LED BLUE φ3, BLUE, BL-SB3248 33-50360-07 LED/D.225/LS.100/.039 D515 LED BLUE φ3, BLUE, BL-SB3248 33-50360-07 LED/D.225/LS.100/.039 D516 LED BLUE φ3, BLUE, BL-SB3248 33-50360-07 LED/D.225/LS.100/.039 D517 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031 D518 Switch Diode 1N4148...
  • Page 44 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT Q546 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB Q547 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB Q548 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB Q549 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB Q550 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB Q551 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB Enhanced RS-232 Line IC501 SP232EEP...
  • Page 45 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R543 Metal Film Resistor 1KΩ, 1/6W, 5% 07-20102-50 AX/.200X.080/.031 R544 Metal Film Resistor 1KΩ, 1/6W, 5% 07-20102-50 AX/.200X.080/.031 R545 Metal Film Resistor 1KΩ, 1/6W, 5% 07-20102-50 AX/.200X.080/.031 R546 Metal Film Resistor 4.7KΩ, 1/6W, ±5% 07-20472-50 AX/.200X.080/.031...
  • Page 46 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT CRYSTAL 11.0592MHz,CL=15pF,HC- X501 Crystal 04-11102-00 CRYSTAL/.450X.200/LS.200/.031 49U/S CONNECTOR X501 Crystal Washer (QW-3) 75-040001-0 J501 Phone Jack SCJ340R0GBS0B00 J17-02001-02 FOR IC503 IC Socket DIP40 13-22540-00 DIP40 UL2468#24AWG,L=240mm, P501A WIRE 14-37510-01 BLKCON.100/VH/TM1SQ/W.200/10 10PIN UL2468#24AWG,L=70mm, P502A...
  • Page 47 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R611 Chip Resistor 1KΩ ,1/8W,±5% 07-90102-00 SM/R_0603 R612 Chip Resistor 1KΩ ,1/8W,±5% 07-90102-00 SM/R_0603 R613 Chip Resistor 18KΩ ,1/8W,±5% 07-90183-00 SM/R_0603 R614 Chip Resistor 18KΩ ,1/8W,±5% 07-90183-00 SM/R_0603 R615 Chip Resistor 10Ω...
  • Page 48 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT FUSE T5AL/250V C A20-12502-00 CONNECTOR AC INLET to UL1672#16AWG , red, WIRE A14-37501-00 Switch L=100mm Switch to Fuse UL1672#16AWG , red, WIRE A14-37501-00 holder L=100mm UL1672#16AWG,blue, AC INLET to J401 WIRE A14-37501-01 L=460mm...

  • Page 49: Exploded View

    EXPLODED VIEW T001 S011 S002 R008 R006 A000 R009 S006 A002 R004 R007 A005 C006 R005 S002 S011 S005 S009 R012 R013 A001 C004 S002 A004 S017 S016 C005 A003 C009 S015 S008 S005 R010 S009 S013 S002 S010 R002 R001 C010 R003...

  • Page 50: Exploded View Parts List

    EXPLODED VIEW PARTS LIST REF.NO PART NO. DESCRIPTION Qty. REF.NO PART NO. DESCRIPTION Qty. A000 01-37501-00 Poweramp Module Assembly F013 77-062001-1 LED Lens Bezel A001 70-124010-1 Main Heatsink 77-062011-1 LED Lens Bezel Ti:2 A002 85-010001-0 Spacer F014 76-062001-1 LED Lens A003 66-018005-0 Thermal Switch Clamping...

  • Page 51: Packing Diagram

    PACKING DIAGRAM REF.N0 Part No. Description Qty. 00-37500-10 C375Bee AH Version AH:1 00-37500-20 C375Bee C Version 00-37500-30 C375Bee CT Version CT:1 90-005002-3 Non-Woven Cloth 90-005001-0 Polybag 89-005002-5 Polyfoam End Cap(2) 89-005001-6 Polyfoam End Cap(1) JA15-10125-01 AC Cord AH:1 or A15-10125-00 JA15-10250-20 AC Cord C/CT:1...
  • Page 52 VERSION HISTORY DATE CIRCUIT CHANGE Improve Power Dissipation in Standby 1) D403 changed from 8.2V to 4.7V 2) Add D409 across IC402 pin1 and pin3, anode connect to pin3 3) D404 changed from 1N4007 to 1N5819, Reconnect D404 cathode from IC402 pin1 to pin3 Dec.
  • Page 53 CHANGE DETAILS: 1. Main board change to VM4.0. PCBA PN changed from 01-37502-00 to 01-37502-01. Below are the changes on this board. a. Add D229 and D232 diode 1N5404 b. Add C282 2200uF/25V electrolytic capacitor c. Add P217B socket d. Add P216B socket 2.
  • Page 54 OLD AND NEW PARTS COMPATIBILITY 1W C375 Version 0.5W C375 Version 1W Version Can not use otherwise VM2.0 standby power consumption PN: 01-37504-10 (AH) will be higher than 0.5W PN: 01-37504-20 (C) Standby Board 0.5W Version VM3.0 Can be used after changing PN: 01-37504-11 (AH) R407 from 3.6K to 6.8K PN: 01-37504-21(C)

  • Page 55: Main Board

    RCA201B RCA201B RCA201A RCA201A RL209A RL209A PHONO L PHONO R PREOUT1/2 LEFT +26V -26V AV6-8.4-13 AV6-8.4-13 AV6-8.4-13 AV6-8.4-13 RL201A RL201A R201 R201 R202 R202 RL201B RL201B MP R IN MP R IN LEFT RIGHT JRC-27F/012/S JRC-27F/012/S C201 C201 C202 C202 RV201A RV201A RCA204A...

  • Page 56: Tone Control

    +5.6V C319 C319 C325 C325 C326 C326 C301 C301 220uF 220uF /25V 10uF 10uF 100nF 100nF C321 C321 R323 R323 R327 R327 R309 R309 100uF 100uF /16V 2.2K 2.2K C327 C327 2.2K 2.2K C303 C303 R317 R317 100nF 100nF 1.5K 1.5K C305 C305...
  • Page 57 C405 C405 F401 F401 /Y Type T1AL/250V T1AL/250V R401 R401 C403 C403 IC402 IC402 N.I. N.I. N.I. N.I. LM7806CT LM7806CT D404 D404 D402 D402 D408 D408 1N5819 1N5819 +5.2VD P6KE200A P6KE200A 1N4007 1N4007 TR402 TR402 D401 D401 FR107 FR107 C407 C407 C409 C409...
  • Page 58 SCHEMATICS DIAGRAM PSU (WITH MDC +8.8V SUPPORT) HS201 HS201 HS202 HS202 Q203 Q203 R255 R255 R256 R256 MPSA92 MPSA92 R250 R250 P206B P206B BR201 BR201 BR202 BR202 70-004003-1 70-004003-1 70-004003-1 70-004003-1 R252 R252 KBU8D KBU8D KBU8D KBU8D FOR BR201&TH201 FOR BR202&TH202 P209A P209A TH201...
  • Page 59 P2.7 P2.6 P0.7 S501 S501 S502 S502 S503 S503 S504 S504 S505 S505 S506 S506 S507 S507 S508 S508 S509 S509 S510 S510 S511 S511 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160 IT-1102D-1160...

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