Sharp CD-C612 Service Manual
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Sharp CD-C612 Service Manual

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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
SERVICE MANUAL
CONTENTS
SHARP CORPORATION
- 1 -
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.
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
CD-C612
No. S3910CDC612//
Page

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  • Page 1: Table Of Contents

    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.

  • Page 2: Important Service Notes (For U.s.a. Only)

    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.

  • Page 3: Names Of Parts

    CD-C612 NAMES OF PARTS CD-C612 Front panel Disc Tray Disc Skip Button Open/Close Button Extra Bass Indicator FM Stereo Mode Indicator FM Stereo Indicator (CD) Repeat Indicator (CD) Play Indicator 10 11 (CD) Pause Indicator Spectrum Analyzer/Volume Level Indicator (TAPE 2) Record Indicator...

  • Page 4: 15. Front Speaker Terminals

    CD-C612 Rear panel AC Power Input Socket FM/AM Loop Aerial Socket Video/Auxiliary (Audio Signal) Input Sockets Rear Speaker Terminals Front Speaker Terminals CP-C612 Front speaker Super Tweeter Woofer Bass Reflex Ducts Speaker Wire GBOXS0024AWM1 Rear speaker Full-Range Speaker Speaker Wire...

  • Page 5: Operation Manual

    CD-C612 OPERATION MANUAL – 5 –...

  • Page 6: Quick Guide

    CD-C612 – 6 –...

  • Page 7: Disassembly

    CD-C612 DISASSEMBLY Caution on Disassembly CD-C612 Follow the below-mentioned notes when disassembling the unit and reassembling it, to keep it safe and ensure excellent performance: Top Cabinet (A1)x2 1. Take cassette tape and compact disc out of the unit. ø3x12mm 2.
  • Page 8 CD-C612 (H1)x1 Switch PWB Display PWB Headphones ø3 x10mm (E1)x8 ø3x10mm Front Panel (E2)x1 Hook CD Servo (H2)x2 (E4)x2 (E1)x1 ø3x10mm (E2)x1 Hook Main (F2)x1 (E1)x1 ø3x10mm CD Player Unit (H2)x2 Hook (F2)x1 (E3)x1 Tape (E3)x3 Figure 8-3 Mechanism (E3)x1...
  • Page 9 CD-C612 Shift Lever (L1)x4 ø3 x12mm (M1)x1 ø2.6 x10mm CD Changer Mechanism CD Player Base CD Mechanism Be careful when installing the CD changer mechanism. Install the CD changer mechanism on the CD player base after the shift lever has been set in the highest position.

  • Page 10: Removing And Reinstalling The Main Parts

    CD-C612 REMOVING AND REINSTALLING THE MAIN PARTS CD MECHANISM SECTION Perform steps 1, 2, 3 and 8-12 of the disassembly method to remove the CD mechanism. Loading / Up / Down Motor How to remove the loading motor (See Fig. 10-1) Motor 1.

  • Page 11: Tuner Section

    CD-C612 TUNER SECTION • VCO Frequency fL: Low-range frequency fH: High-renge frequency Frequency Frequency Adjusting Instrument Display Parts Connection 98.00 MHz 98.00 MHz VR351* Pin 13, Pin 21 • AM IF/RF (60 dB) and ground Signal generator: 400 Hz, 30%, AM modulated of IC303 * Adjust for 76 kHz ±...

  • Page 12: Test Mode

    CD-C612 TEST MODE • Setting the test mode Any one of test mode can be set by pressing several keys as follows. <REC. PAUSE> + <DISC. SKIP> + <POWER> TEST: CD operation test • TEST mode Function — CD test mode Setting of TEST mode Indication of CD TST mode (Fig.

  • Page 13: Notes On Schematic Diagram

    CD-C612 NOTES ON SCHEMATIC DIAGRAM • The indicated voltage in each section is the one measured • Resistor: by Digital Multimeter between such a section and the chas- To differentiate the units of resistors, such symbol as K and sis with no signal given.

  • Page 14: Waveforms Of Cd Circuit

    CD-C612 WAVEFORMS OF CD CIRCUIT STOP PLAY FOCUS SERCH 0.5ms 0.50 V 10.0 V IC1 20 F.E 0.5ms 10.0 V 0.5ms 5.0 V 0.50 V IC1 54 DRF 0.5ms 1.00 V PLAY 0.5ms NORMAL DISC 1.00 V TN0=01 20ms 1.00 V 0.5ms...

  • Page 15: Block Diagram

    CD-C612 TO DISPLAY TO MAIN SECTION (TO IC601) SECTION 1 2 3 4 5 6 CNP11 – 9 8 7 6 5 4 3 2 1 CNS10 9 8 7 6 5 4 3 2 1 CNP10 SWITCHING REGULATOR 37 36 38...
  • Page 16 CD-C612 SWM3 AM LOOP FOOL PROOF ANTENNA ANTENNA SWM4 F.A.S SOLM1 IC301 SOLENOID FM IF FM IF TA7358AP SWM5 CF301 T301 BF301 FM FRONT END FM B.P.F VR351 AM IF AMIF MPX VCO ADJ T351 CF351 T352 MONO FM IF IN...
  • Page 17 CD-C612 FL701 DISPLAY Q702 1 2 3 4 37 38 39 Q703 TAPE MOTOR Q705 Q706 Q707 MONO/ST O/ST IC701 LED722 IX0280AW SYSTEM CONTROL MICROCOMPUTER AVDD RX701 UNSWITCH MEMORY BACK UP 9 8 7 6 5 4 3 2 1...

  • Page 18: Schematic Diagram / Wiring Side Of P.w.board

    CD-C612 0.01 47/16 1/50 0.33/50 0.01 2SA1318 LASER DRIVER 55 54 53 52 51 50 49 64 63 61 60 VCC1 CNS1B CNS1A – + FIN2 – + FIN1 EFBAL – + – + FOSTA – + DGND TOSTA – +...
  • Page 19 CD-C612 CD SERVO PWB-B R57 1K CD SIGNAL R58 1K R59 1K R61 1K R62 1K 100P 0.01 (CH) 64 63 60 59 58 57 56 55 54 53 52 51 50 EFLG µ-COM SBSY SUB-CODE INTERFACE DEF1 XVSS 16.93MHz...
  • Page 20 CD-C612 AM LOOP ANT FM ANT CNP301 AM ANT FM FRONT END BF301 C330 T331 IC301 TA7358AP 8.2P 1 2 3 (UJ) C302 10P (CH) C314 R305 C303 10/16 VD331 0.01 SVC348S C306 FM BAND 18P(CH) COVERAGE fL T333 L303...
  • Page 21 CD-C612 TP302 AM TRACKING fL M ANT T331 R340 FM DET R349 R350 1.5K T352 R321 R348 T333 C358 0.0015 R352 R375 VR351 1.2K 6.8K(B) M OSC IC303 LA1805 FM/AM IF MPX. AGE fL 9 10 Q343 KRA109 M C364...
  • Page 22 CD-C612 R-CH R648 2.7K A_GND L-CH R647 CD_GND 2.7K C601 4.7/50 R607 1.5K +12V R608 1.5K R605 1.5K R606 1.5K CNS11 R603 1.5K R604 1.5K R601 1.5K R602 1.5K C611 0.033 C612 0.033 C603 4.7/50 C613 0.22 C614 0.22 R635...
  • Page 23 CD-C612 PLAYBACK SIGNAL RECORD SIGNAL FM SIGNAL CD SIGNAL JK601 L-CH C631 R631 R633 C602 8.2K 390P VIDEO 4.7/50 C632 R634 L601 R632 390P 2.2µH 8.2K 1.5K R-CH 1.5K R642 D601 1.5K 1SS133 1.5K C604 4.7/50 D602 0.033 1SS133 R641 0.22...
  • Page 24 CD-C612 – IC961 – FM SIGNAL LA4451 POWER AMP. C968 0.001 1000 C976 1000/25 D901 C980 1N4004S 0.047 D903 (ML) 1N4004S D902 R972 1N4004S D904 (1/4) 1N4004S C963 R967 R961 C961 1/50 0.0015 A_GND R962 C962 0.0015 C964 1/50 POWER...
  • Page 25 CD-C612 HEADPHONES PWB-A4 JK970 FW801 HEADPHONES C975 R982 R981 1000/25 330 (1/2W) 330 (1/2W) C976 1000/25 C979 C980 0.047 0.047 (ML) (ML) SO961 R973 SPEAKER TERMINAL R972 (1/2W) (1/4) SP_L-CH_GND SP_R-CH_GND SP_L-CH SP_R-CH C991 47/50 SP_REAR_L-CH_GND C992 SP_REAR_R-CH_GND 47/50 SP_REAR_L-CH...
  • Page 26 CD-C612 DISPLAY PWB-A2 FL701 FL DISPLAY 1 2 3 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 R721 R722 100K 100K R723 100K Q705 Q706 Q707 2SC3331 2SC3331 2SC3331 C720...
  • Page 27 CD-C612 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 C706 1/50 C709 0.022 R780 C710 220/10 R778 R777 R776 R775 R772 CD DSP RWC R771 RESET C707 XL701 4.19MHz C708...
  • Page 28 CD-C612 CD MOTOR PWB-C SOLM2 SLED MOTOR SOLENOID CENSOR SPINDLE MOTOR PWB-D PICKUP IN CNS3A CNS3B DISC NUMBER TURNTABLE UP/ DOWN LOADING PICKUP UNIT MOTOR OPEN/CLOSE BIM5 CNS1A CNS1B CNS5 MECHA UP CNS2A CNS2B 10 9 8 7 6 5 4 3 2 1...

  • Page 29: Tape Mechanism

    CD-C612 TAPE MECHANISM PWB-E FROM SWM3 DISPLAY FOOL PROOF CNS702 FWM2 P30 5-C CNPM1 FWM1 CNPM2 PHM1 SOLENOID SOLM1 SWM4 F. A. S TAPE MOTOR SWM5 TAPE 1 TAPE 2 PLAYBACK HEAD ERASE HEAD RECORD/PLAYBACK HEAD YL WH BK BL PK...
  • Page 30 CD-C612 SWITCH PWB-A3 SW708 SW709 RD08 SW730 FW701 SW729 DIMMER SW728 EQUALIZER RD27 1 2 3 C551 X-BASS RD28 C712 D723 R798 IC704 R797 C557 C566 R562 D718 Q704 D719 R578 IC563 C713 3 2 1 D720 D554 R570 R795...
  • Page 31 CD-C612 HEADPHONES PWB-A4 MAIN PWB-A1 JK970 HEADPHONES T802 POWER TRANSFORMER C809 C810 LG901 D816 IC961 Q823 Q822 Q824 D903 3 2 1 3 2 1 B C E 2 3 4 5 6 7 8 9 10 11 12 13 14...

  • Page 32: Voltage

    CD-C612 VOLTAGE IC301 IC302 IC303 IC701 PIN VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE VOLTAGE 2.5V 2.5V 0.9V (0V) 2.6V (2.6V) 1.6V (1.6V) 4.8V 4.8V 2.5V 2.6V 4.8V 4.8V 1.6V (0V) 0V (0V) 1.6V (1.6V) 2.5V...

  • Page 33: Troubleshooting (Cd Section)

    CD-C612 TROUBLESHOOTING (CD SECTION) When the CD does not function When the CD section does not operate when the objective lens of the optical pickup is dirty, this section may not operate. Clean the objective lens, and check the playback operation. When this section does not operate even after the above step is taken, check the following items.
  • Page 34 CD-C612 • When the turntable fails to stop. Is from 5 V till 2.5V down pulse (approx. 300 ms) Check the SWM3 and the wiring from the IC701 pin 21 to the 2.5V SWM3. input into the IC701 pin 21 when the turntable is rotating?
  • Page 35 CD-C612 • When the CD tray fails to open or close. Check the OPEN CLOSE SW and the wiring from the IC701 Is there following voltage input in specific state of IC701 pin 19? pin 19 to the OPEN CLOSE SW.
  • Page 36 CD-C612 • Playback can only be performed when a disc is loaded. Check the laser diode driver. Is the Focus servo active? (Can you hear it working?) Check the area around IC1(16) - (21) (focus servo circuit). If the disc is not turning, the DRF Does the DRF signal change from "L"...
  • Page 37 CD-C612 • Checking the spin system. Play operation is performed without disc. The turntable rotates a little. The spin driver circuit is normal. Check the periphery of IC1 pins 23 to 27, pin 39, and pin 40, IC2 The turntable fails to rotate or rotates at high speed.

  • Page 38: Function Table Of Ic

    CD-C612 FUNCTION TABLE OF IC IC1 VHiLA9241M/-1: Servo Amp. (LA9241M) (1/2) Function Port Name Pin No. FIN2 Connection pin for photodiode of pickup. RF signal is generated through addition with FIN pin, and FE signal is generated through subtraction. FIN1 Connection pin for photodiode of pickup.
  • Page 39 CD-C612 IC1 VHiLA9241M/-1:Servo Amp.(LA9241M) (2/2) Function Port Name Pin No. Micro computer command clock input pin. Micro computer command data input pin. Micro computer command chip enable input pin. (DETECT RF) RF level detection output. (Focus Serch Select) Pin to switch focus search mode. (± search/+ search for reference voltage) VCC2 VCC pin for servo system and digital system.
  • Page 40 CD-C612 IC2 VHiLC78622N-1: Servo/Signal Control (LC78622N) (1/2) Terminal Name Input/Output Function DEFI Input Defect detection signal (DFF) input terminal. (When this terminal is not used, connect it to 0V.) Input For PLL Input terminal for test. Pull-down resistor built in. Be sure to connect this terminal to 0V.
  • Page 41 CD-C612 IC2 VHiLC78622N-1: Servo/Signal Control (LC78622N) (2/2) Terminal Name Input/Output Function SBSY Output Sub-code clock sync signal output terminal. EFLG Output C1, C2, single, double correction monitor terminal. Output Sub-code P, Q, R, S, T, U, and W output terminal.
  • Page 42 CD-C612 IC3 VHiM63001FP-1: Focus/Tracking/Spin/Slide Driver (M63001FP) Pin No. Terminal Function IN2– IN6+ Name IN2- CH2 inverted input. IN1A– IN6– IN1A- CH1 inverted input. IN1B– VCC4 IN1B- CH1 output offset control. OUT1- CH1 inverted output. OUT1– OUT6– OUT1+ CH1 non-inverted output.
  • Page 43 CD-C612 IC701 RH-iX0280AWZZ:System Microcomputer (IX0280AW) (1/2) Pin No. Port Name Terminal Name Input/Output Function — (+) POWER SUPPLY Output DOLBY PROLOGIC ENABLE TERMINAL Input DATA INPUT Output DATA OUTPUT Output CE OUTPUT Output CLOCK OUTPUT 7*,8* P32, P31 LCK1, LCK2...
  • Page 44 CD-C612 IC701 RH-iX0280AWZZ:System Microcomputer (IX0280AW) (1/2) Pin No. Port Name Terminal Name Input/Output Function P116 KEY JOG A Input KEY JOG INPUT A P115 KEY JOG B Input KEY JOG INPUT B P114 S MUTE Output SYSTEM MUTE P113 C MUTE...

  • Page 45: Fl Display

    CD-C612 FL701 VVKBJ685GNK-1: FL Display S5 S4 B5 B6 B7 [ 1G~8G ] [ 10G ] ANODE CONNECTION 2G~6G (LOWER) Figure 45 FL DISPLAY – 45 –...
  • Page 46 CD-C612 –– MEMO –– – 46 –...

  • Page 47: Parts Guide

    CD-C612 PARTS GUIDE CD-C612 MODEL CD-C612 mini component system consisting of CD-C612 (Main unit), CP-C612 (Front speaker) and GBOXS0024AWM1 (rear speaker ). “HOW TO ORDER REPLACEMENT PARTS” To have your order filled promptly and correctly, please furnish the For U.S.A. only following information.
  • Page 48 CD-C612 PRICE PRICE PARTS CODE DESCRIPTION PARTS CODE DESCRIPTION RANK RANK ZD351 VHEMTZJ5R1B-1 AC Zener,5.1V,MTZJ5.1B CD-C612 ZD551 VHEMTZJ6R2C-1 AC Zener,6.2V,MTZJ6.2C ZD601,602 VHEMTZJ2R4B-1 AB Zener,2.4V,MTZJ2.4B INTEGRATED CIRCUITS ZD801 VHEMTZJ6R2A-1 AA Zener,6.2V,MTZJ6.2A ZD802 VHEMTZJ300B-1 AB Zener,30V,MTZJ30B VHILA9241M/-1 AS Servo Amp.,LA9241M FILTERS VHILC78622N-1...
  • Page 49 CD-C612 PRICE PRICE DESCRIPTION PARTS CODE DESCRIPTION PARTS CODE RANK RANK AA 0.047 µF,16V AA 0.001 µF,50V C39,40 VCTYPA1CX473K C395 VCKYBT1HB102K AC 330 µF,6.3V,Electrolytic VCEAZA0JW337M J C551 VCKYMN1HB271K J AA 270 pF,50V AA 0.0027 µF,16V C44~47 VCCCTV1HH101J AA 100 pF (CH),50V...
  • Page 50 CD-C612 PRICE PRICE PARTS CODE DESCRIPTION PARTS CODE DESCRIPTION RANK RANK VRS-TV2AB273J AA 27 kohms,1/10W R162 VRD-MN2BD473J AA 47 kohms,1/8W VRS-TV2AB123J AA 12 kohms,1/10W R164 VRD-MN2BD472J AA 4.7 kohms,1/8W VRS-TV2AB332J AA 3.3 kohms,1/10W R166 VRD-MN2BD473J AA 47 kohms,1/8W VRS-TV2AB333J AA 33 kohms,1/10W...
  • Page 51 CD-C612 PRICE PRICE DESCRIPTION PARTS CODE DESCRIPTION PARTS CODE RANK RANK R712 VRD-ST2CD223J AA 22 kohms,1/6W CNP2 QCNCM705HAFZZ J AB Plug,8Pin R713~715 VRD-ST2CD102J AA 1 kohm,1/6W CNP3 92LCONE6P53253 J AC Plug,6Pin R716 VRD-ST2CD330J AA 33 ohms,1/6W CNP3A 92LCONE6P53254 J AC Plug,6Pin...
  • Page 52 CD-C612 PRICE PRICE PARTS CODE DESCRIPTION PARTS CODE DESCRIPTION RANK RANK NGERH0012AWZZ J AC Gear,Drive 244-13 JKNBZ0605AWSA AF Button,Volume MLEVP0010AWZZ J AC Rail,Guide 244-14 JKNBZ0618AWSA AC Button,Dimmer/Equalizer NSFTM0002AWFW J AE Shaft,Guide 244-15 PCUSG0022AWZZ J AB Cushion,Leg 92LM-CUSN1524A J AC Cushion...

  • Page 53: Cp-C612 4

    CD-C612 PRICE PRICE DESCRIPTION PARTS CODE DESCRIPTION PARTS CODE RANK RANK RRMCG0177AWSA J AS Remote Control GFTAB1022AWSA J Battery Lid,Remote Control P.W.B. ASSEMBLY (Not Replacement Item) PWB-A1~4 92LPWB3079MANS J — Main/Display/Switch/Head- phones PWB-B 92LPWB3072CDUS J — CD Servo PWB-C QPWBF0027AWZZ J...
  • Page 54 CD-C612 CD-C612 306-2 306-1 306-3 703x2 703x2 305x2 PWB-C Figure 7 CD MECHANISM EXPLODED VIEW – 7 – – 52 –...
  • Page 55 CD-C612 CD-C612 249-1 611x4 613x2 PWB-A3 PWB-A2 613x5 614x2 249-2 PWB-A1 FL701 244-12 T802 244-8 244-11 240x4 244-10 244-4 Silicon 244-5 615x5 grease 244-14 244-1 244-7 244-9 IC961 Q824 Q823 244-6 Q822 244-13 PWB-A4 PWB-E 613x6 244-3 204(204-1, 204-2, 204-3,...
  • Page 56 CD-C612 CD-C612 255-3 255-2 612x2 255-1 251-3 612x2 251-2 251-1 251-4 236x2 MECHANISM 609x2 PWB-D 610x4 SOLM2 PWB-B Figure 9 CABINET EXPLODED VIEW (2/2) – 54 – – 9 –...
  • Page 57 CD-C612 CP-C612 705x4 SP3,4 SP1,2 PIEZO SP3,4 PIEZO SP3(L-CH) SP4(R-CH) WOOFER SP1(L-CH) SP2(R-CH) WOOFER SP1,2 Figure 10 SPEAKER EXPLODED VIEW (1/3) – 10 – – 55 –...
  • Page 58 CD-C612 GBOXS0024AWM1 703x6 SP1,2 SP1,2 Figure 11 SPEAKER EXPLODED VIEW (3/3) – 56 – – 11 –...

  • Page 59: Packing Of The Set (For U.s.a. Only)

    CD-C612 PACKING OFF THE SET (For U.S.A. Only) Setting position of switches and knobs Tape Mechanism STOP Front Speaker(L/R) CP-C612 CD-C612 UNIT 92L411-0108 SPAKP0013AWZZ1 Polyethylene Bag Polyethylene bag SPAKA0212AWZZ Packing Add.,(Left/Right) Bottom 92L412-0125 Packing Add., (Top/Bottom) Rear Speaker(L/R) GBOXS0024AWM1 FM/AM Loop Antenna...
  • Page 60 CD-C612 © COPYRIGHT 1999 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

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