CD-C612 SERVICE MANUAL No. S3910CDC612// CD-C612 CD-C612 mini component system consisting of CD-C612 (Main unit), CP-C612 (Front speaker) and GBOXS0024AWM1 (rear speaker ). • In the interests of user-safety the set should be restored to its original condition and only parts identical to those specified be used. CONTENTS Page IMPORTANT SERVICE NOTES (For U.S.A. Only) ........................................................................................................... 2 SPECIFICATIONS .............................................................................................................................................................. 2 NAMES OF PARTS ........................................................................................................................................................... 3 OPERATION MANUAL ...................................................................................................................................................... 5 QUICK GUIDE ................................................................................................................................................................... 6 DISASSEMBLY .................................................................................................................................................................. 7 REMOVING AND REINSTALLING THE MAIN PARTS ................................................................................................... 10 ADJUSTMENT ................................................................................................................................................................. 10 NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 13 WAVEFORMS OF CD CIRCUIT ...................................................................................................................................... 14 BLOCK DIAGRAM ........................................................................................................................................................... 15 SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD .............................................................................................. 18 VOLTAGE ......................................................................................................................................................................... 32 TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 33 FUNCTION TABLE OF IC................................................................................................................................................ 38 FL DISPLAY ...................................................................................................................................................................... 45 REPLACEMENT PARTS LIST/EXPLODED VIEW PACKING OF THE SET (For U.S.A. Only) This document has been published to be used for after sales service only. SHARP CORPORATION– 1 – The contents are subject to change without notice. CD-C612 FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. IMPORTANT SERVICE NOTES (For U.S.A. Only) BEFORE RETURNING THE AUDIO PRODUCT (Fire & Shock Hazard) Before returning the audio product to the user, perform the following safety checks. 1. Inspect all lead dress to make certain that leads are not VTVM pinched or that hardware is not lodged between the chassis AC SCALE and other metal parts in the audio product. 2. Inspect all protective devices such as insulating materials, 1.5k ohms cabinet, terminal board, adjustment and compartment covers 10W or shields, mechanical insulators etc. 3. To be sure that no shock hazard exists, check for leakage current in the following manner. µ * Plug the AC line cord directly into a 120 volt AC outlet. 0.15 F * Using two clip leads, connect a 1.5k ohm, 10 watt resistor TEST PROBE CONNECT TO TO EXPOSED paralleled by a 0.15µF capacitor in series with all exposed KNOWN EARTH METAL PARTS metal cabinet parts and a known earth ground, such as GROUND conduit or electrical ground connected to earth ground. * Use a VTVM or VOM with 1000 ohm per volt, or higher, sensitivity to measure the AC voltage drop across the All check must be repeated with the AC line cord plug connection resistor (See diagram). reversed. * Connect the resistor connection to all exposed metal parts Any reading of 0.3 volt RMS (this corresponds to 0.2 milliamp. having a return path to the chassis (antenna, metal cabinet, AC.) or more is excessive and indicates a potential shock screw heads, knobs and control shafts, escutcheon, etc.) hazard which must be corrected before returning the audio and measure the AC voltage drop across the resistor. product to the owner. SPECIFICATIONS Compact disc player section Type: 3-disc multi-play compact disc CD-C612 player Signal readout: Non-contact, 3-beam semi- General conductor laser pickup Power source: AC 120 V, 60 Hz D/A Converter: 1-bit D/A converter Power consumption: Stand-by; 0.3 W Frequency response: 20 - 20,000 Hz Power on; 50 W Dynamic range: 90 dB (1 kHz) Dimensions: Width; 10-5/8" (270 mm) Height; 11-13/16" (300 mm) Depth; 13-7/8" (353 mm) Front speaker section Weight: 11.7 lbs. (5.3 kg) CP-C612 Type: 2-way type [5" (13 cm) Amplifier section woofer and super tweeter] Output power: 20 watts minimum RMS per Maximum input power: 30 W channel into 4 ohms from 80 Hz Rated input power: 15 W to 20 kHz, 10 % total harmonic Impedance: 5.4 ohms distortion Dimensions: Width; 8-11/16" (220 mm) Output terminals: Front speakers; 5.4 ohms Height; 11-13/16" (300 mm) Rear speakers; 16 ohms Depth; 8-3/6" (213 mm) Headphones; 16-50 ohms Weight: 6.5 lbs. (2.9 kg)/each (recommended; 32 ohms) Input terminals: Video/Auxiliary (audio signal); 500 mV/47 kohms Rear speaker section GBOXS0024AWM1 Tuner section Type: 4" (10 cm) full range speaker Frequency range: FM; 87.5 - 108 MHz Maximum input power: 10 W AM; 530 - 1,720 kHz Rated input power: 5 W Impedance: 16 ohms Cassette deck section Dimensions: Width; 6-3/4" (170 mm) Frequency response: 50 - 14,000 Hz (Normal tape) Height; 6-3/4" (170 mm) Signal/noise ratio: 55 dB (TAPE 1, playback) Depth; 3-1/2" (88 mm) 50 dB (TAPE 2, recording/ Weight: 1.0 lbs. (0.5 kg)/each playback) Wow and flutter: 0.15 % (WRMS) Specifications for this model are subject to change without prior notice. – 2 – CD-C612 NAMES OF PARTS CD-C612 ■ Front panel 123 11. Disc Tray 12. Disc Skip Button 13. Open/Close Button 14. Extra Bass Indicator 15. FM Stereo Mode Indicator 4 7 16. FM Stereo Indicator 5 8 17. (CD) Repeat Indicator 6 9 18. (CD) Play Indicator 19. (CD) Pause Indicator 10 11 12 10. Spectrum Analyzer/Volume Level Indicator 13 11. (TAPE 2) Record Indicator 14 12. (CD) Disc Number Indicators 15 13. (CD/TUNER) Memory Indicator 14. Timer Play Indicator 16 15. Timer Record Indicator 16. Sleep Indicator 17 18 19 17. (TAPE 2) Record Pause Button 18. (CD) Track Down/Review Button 3 (TUNER) Preset Down Button 20 24 3 (TAPE 2) Rewind Button 19. (CD) Track Up/Cue Button 21 25 3 (TUNER) Preset Up Button 22 26 3 (TAPE 2) Fast Forward Button 20. Timer/Sleep Button 23 21. Clock Button 22. Timer Set Indicator 27 28 29 30 31 32 33 23. Power Button 24. Equalizer Mode Selector Button 25. Dimmer Button 26. Extra Bass/Demo Mode Button 27. Function Selector Buttons 28. Memory/Set Button 29. (CD/TAPE) Stop Button 30. (TAPE) Play Button 3 (CD) Play/Repeat Button 31. Tuning and Time Up/Down Buttons 32. Volume Up/Down Buttons 33. Headphone Socket 34 35 34. (TAPE 1) Cassette Compartment 35. (TAPE 2) Cassette Compartment – 3 – CD-C612 ■ Rear panel 11. AC Power Input Socket 12. FM/AM Loop Aerial Socket 2 13. Video/Auxiliary (Audio Signal) Input Sockets 14. Rear Speaker Terminals 15. Front Speaker Terminals 1 3 4 5 CP-C612 ■ Front speaker 11. Super Tweeter 1 12. Woofer 13. Bass Reflex Ducts 2 14. Speaker Wire 4 3 GBOXS0024AWM1 ■ Rear speaker 11. Full-Range Speaker 1 12. Speaker Wire ■ Remote control 2 11. Remote Control Transmitter LED ● CD control section 1 12. Disc Number Select Buttons 13. Memory Button 14. Pause Button 15. Clear Button 2 8 16. Track Down/Review Button 17. Track Up/Cue Button 3 9 18. Disc Skip Button 4 10 19. Play/Repeat Button 10. Stop Button 5 11 11. Random Button 6 12 7 ● Tuner control section 12. Preset Up/Down Buttons 13 14 15 16 17 18 ● Tape control section 13. (TAPE 1) Play Button 14. (TAPE 2) Record Pause Button 15. (TAPE 1/2) Stop Button 19 16. (TAPE 2) Play Button 17. (TAPE 2) Rewind Button 20 18. (TAPE 2) Fast Forward Button 21 23 ● Common section 22 19. Equalizer Mode Selector Button 20. Function Selector Buttons 21. Power Button 22. Extra Bass Button 23. Volume Up/Down Buttons – 4 – SETTING THE CLOCK RESETTING THE MICROCOMPUTER Reset the microcomputer under the following conditions: (Main unit operation) 1 Press the POWER button to enter the stand-by mode. 2 ● To erase all of the stored memory contents (clock and timer settings, and tuner and CD presets). 2 Press the CLOCK button. In this example, the clock is set for the 12- ● If the display is not correct. hour (AM 12:00) system. 3 Within 5 seconds, press the MEMORY/SET button. ● If the operation is not correct. Press the POWER button to enter the stand-by mode. 4 Press the TUNING/TIME ( or ) button to select the time 1 display mode. 1,2 While pressing down the button and the but- → 2 "AM 12:00" The 12-hour display