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NAD C 521 Service Manual

Nad c 521 compact disc player service manual
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See also: Service Manual , Owner's Manual
NAD
C 521
COMPACT
DISC PLAYER

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Summary of Contents for NAD C 521

  • Page 1 C 521 COMPACT DISC PLAYER...

  • Page 2: Safety Information

    SAFETY INFORMATION CAUTION CAUTION VARING - INVISIBLE LASER RADIATION WHEN OPEN AND - OSYNLING LASERSTRÅLNING NÄR DENNADEL ÄR ÖPPNAD OCH SPÄRRAR ÄR URKOPPLADE. STRÅLEN ÄR FARLIG. INTERLOCKS DEFEATED.AVOID EXPOSURE TO BEAM. CLASS 1 VARO! -AVATTAESSAJASUOJALUKITUS OHITETTAESSAOLET ADVARSEL - USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG ALTTIINANÄKTMÄTÖNTÄ...

  • Page 3: Table Of Contents

    SERVICE SAFETY PRECAUTIONS Replacing the fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE. Reference No Part Number Description M502-M504 5120-0020-0 FU T1A 250V UL/CSA 5X20MM M502-M504 5120-0018-0 FU T1A 250V SEMKO/UDE 5X20MM M505 5120-0052-0 FUSE T1.6A 250V 5X20MM UL/CSA...

  • Page 4: Specifications

    SPECIFICATIONS Disc Capacity ......One Disc, 120 or 80 mm Decoding ....... . BURR-BROWN Delta Sigma 20bit Digital Filter .

  • Page 5: Rear Panel / Front Panel

    REAR PANEL / FRONT PANEL REAR PANEL 1. LINE OUT 3. AC LINE CORD 2. DIGITAL OUT FRONT PANEL 1. POWER ON / OFF 7. STOP 2. DISC DRAWER 8. REPEAT 3. DISPLAY 9. RANDOM 4. OPEN 10. SCAN Back ( ) / Forward ( 5.

  • Page 6: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1. Remove machine screws M 4.0 x 6.0 ( 1 to 4 ) from the side panels. Remove tapping screw 3.0 x 8.5 5 from the back panel. Refer to Figure No.1. Figure No.1 2. Pull both sides of the TOP COVER slightly outwards 6 and tilt approx. 35˚ and then remove in the direction as indicated by the arrow 7 .

  • Page 7: Block Diagram

    BLOCK DIAGRAM DISC...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM 230V:J403 115V:J401,J404 ISSUE 1723-006A-0000 J403 J404...

  • Page 9: Rf Pattern Testing

    RF PATTERN TESTING NAD - C 521 PCB TESTING POINTS DIAGRAM TESTING PROCEDURE (1) Load the test disc (Sony Test CD YEDS-7) and set the unit into PLAY mode. (2) Connect the scope to R132 (Pin 41 of U101) and DGND (J334).

  • Page 10: Important Notes

    IMPORTANT NOTES INSTRUCTION FOR HANDLING OPTICAL SYSTEM BLOCK PICK-UP Electrostatic breakdown of the laser diode in the optical system block may occur due to a poten- tial difference caused by electrostatic charge accumulated on clothing, human body, etc. A ground must be provided as follows to prevent any electrostatic charge during unpacking or repair work.
  • Page 11 PRECAUTIONS WHEN CHANGING LASER PICK-UP When removing the pick-up assembly, short circuit the PCB tracks on the optical block as show in the drawing in order to protect the pick-up before removal. NOTE: Replacement pick-up assemblies are supplied with the PCB pattern already protected. DO NOT REMOVE THE SHORT CIRCUITS UNTIL YOU HAVE FINISHED FITTING THE PICK- Protective soldering place for laser diode...

  • Page 12: Pcb Layout

    PCB LAYOUT TRANSFORMER BOARD L401 J401 J407 J402 J406 LIVE BOARD KEY BOARD DISPLAY BOARD...
  • Page 14 4.9V 4.9V 4.9V 2.3V 2.4V 2.4V 3.7V 2.6V 2.2V 4.8V 2.4V 2.3V 2.4V 2.4V #4.9V 2.4V 4.9V 4.9V 2.4V 2.4V 4.9V 4.9V 2.4V 2.4V 4.9V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 4.9V 7.8V *7.4V 4.8V 2.5V 2.5V *2.7V 1.2V 2.5V 2.5V *2.7V...

  • Page 15: Ic Block Diagram

    IC BLOCK DIAGRAM U101: LA9240 57 56 55 54 53 52 51 50 48 NC RF DET FIN2 47 TBC FIN1 46 FSC - com 45 DGND INTER FACE 44 SLI 43 SLC 42 RFS– TE– 41 RFSM RF Amp TESI T.SERVO &...
  • Page 16 U302: PCM1710U LRCIN ML/DSD Input Interface MC/DM2 Digital Mode Filter Control BCKIN MC/DM1 CLKO MUTE Timing Control MODE CKSL Noise Shaper DGND DGND 5-Level DAC 5-Level DAC Right Left VCC2R VCC2L AGND2R AGND2L Low Pass Filter Low Pass Filter Right Left EXT1R EXT1L...
  • Page 17 U701: LB1641 OUT1 VCC2 OUT2 VCC1 Input logic circuit U201: LA6541D...
  • Page 18 U401: LC587206A 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 COM4 COM3 COM2 COM1 CUP1 CFOUT CUP2 CFIN 9 10 11 12 13 14 15 16 S port K port M port...

  • Page 19: Troubleshooting Guide

    TROUBLESHOOTING GUIDE SET POWER SWITCH TO ON. CHECK FUSES M502, M503, CHECK POWER SUPPLY POWER SUPPLY PATTERNS OPEN IS POWER TURNED ON ? M504, M505 OPEN ? CIRCUIT NORMAL ? OR U501-U504,U506-U507 DEFECTIVE. IS OSCILLATOR CIRCUIT M502, M503, M504, M505 CRYSTAL M401 DEFECTIVE.

  • Page 20: Mechanism Exploded View

    MECHANISM EXPLODED VIEW CD11CA...

  • Page 21: Exploded View

    EXPLODED VIEW...

  • Page 22: Packing Diagram

    REMOTE CONTROL HANDSET 1497-1302-1 REMOTE CONTROL POLYBAG 4301-4104-1 INSTRUCTION MANUAL 1497-1062-0 MANUAL POLYBAG 1435-4300-1-2 CARTON BOX Proprietary information for servicing purposes only. The information herein may not be used com- mercially without the prior written agreement of NAD Electronics International, Toronto, Canada.

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