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Sharp CD-C452 Service Manual
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Sharp CD-C452 Service Manual

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Illustration: CD-C452/C452C
Manufactured under license from Dolby Laboratories Licens-
ing Corporation. DOLBY, the double-D symbol
"PRO LOGIC" are trademarks of Dolby Laboratories Licens-
ing Corporation.
QSound Labs, Inc.
QSound is protected under US Patent Nos. 5,105,462
and 5,208,860 and foreign counterparts.
IMPORTANT SERVICE NOTES (For U.S.A. Only) .......................................................................................................... 2
SPECIFICATIONS ............................................................................................................................................................. 2
NAMES OF PARTS .......................................................................................................................................................... 3
QUICK GUIDE .................................................................................................................................................................. 5
DISASSEMBLY ................................................................................................................................................................. 6
NOTES ON SCHEMATIC DIAGRAM ............................................................................................................................... 9
WAVEFORMS OF CD CIRCUIT ..................................................................................................................................... 10
BLOCK DIAGRAM .......................................................................................................................................................... 11
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD ............................................................................................. 14
FUNCTION TABLE OF IC ................................................................................................................................................ 28
REPLACEMENT PARTS LIST/EXPLODED VIEW
SERVICE MANUAL
and
CONTENTS

SHARP CORPORATION

- 1 -
CD-C452/C452C
CP-C452 Constitute CD-C452/C452C.
• 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 Service Manual is for the CD-C452/452C, which is a minor-
modification model of the CD-C472. This manual, therefore,
describes only the changed points from the Service manual.
Please refer to the CD-C472 Service Manual (No. S2812CDC472//)
together with this manual.
CD-C472
OPERATION MANUAL .................................................... 5
ADJUSTMENT ............................................................... 12
FUNCTION TABLE OF IC .............................................. 38
FL DISPLAY ................................................................... 44
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
CD-C452/C452C
No. S4825CDC452//
Page
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Summary of Contents for Sharp CD-C452

  • Page 1: Table Of Contents

    Illustration: CD-C452/C452C This Service Manual is for the CD-C452/452C, which is a minor- modification model of the CD-C472. This manual, therefore, describes only the changed points from the Service manual.

  • Page 2: Operation Manual

    CD-C452/C452C 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-C452/C452C NAMES OF PARTS CD-C452/C452C Front Panel 1. Disc Tray 2. Disc Number Selector Buttons 3. Disc Skip Button 4. Open/Close Button: 5. Disc Number Indicator 6. Timer Indicator 6 7 8 7. Record Indicator 8. Sleep Indicator 9. Extra Bass Indicator: X-BASS...
  • Page 4 CD-C452/C452C Speaker Section Front Speaker Left speaker Right speaker CP-C452 1. Super Tweeter 2. Tweeter 3. Woofer 4. Bass Reflex Duct 5. Speaker Wire CD-C452/C452C Tape control section Remote Control 19. (TAPE 1) Play Button: 1. Remote Control Transmitter LED 20.

  • Page 5: Quick Guide

    CD-C452/C452C – 5 –...

  • Page 6: Disassembly

    CD-C452/C452C DISASSEMBLY CD-C452/C452C Caution on Disassembly Follow the below-mentioned notes when disassembling the unit and reassembling it, to keep it safe and ensure excellent performance: ( A1 ) x2 Top Cabinet 1. Take cassette tape and compact disc out of the unit.
  • Page 7 CD-C452/C452C ( K1 ) x1 ø3 x10mm Front Panel ( E4 ) x1 ( K2 ) x1 Washer ( E2 ) x2 Turntable ( E3 ) x1 Push Power Amp. Tape CD Player Base Mechanism Push ( L1 ) x1 ø3 x10mm...
  • Page 8 CD-C452/C452C CP-C452 CP-C452 STEP REMOVAL PROCEDURE FIGURE Front Speaker 1. Net ......(A1) x1 2. Baffle Board ... (A2) x1 Tweeter 3. Screw ..... (A3) x2 Baffle Board 4. Screw ..... (A4) x4 5. Screw ..... (A5) x2 ( A2 ) x1...

  • Page 9: Notes On Schematic Diagram

    CD-C452/C452C 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 10: Removing And Reinstalling The Main Parts

    CD-C452/C452C 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 11: Block Diagram

    CD-C452/C452C Figure 11 BLOCK DIAGRAM (1/3) – 11 –...

  • Page 12: Adjustment

    CD-C452/C452C FM&AM LOOP ANT FM IF FM BPF IC301 VR351 FM FRONT END MPX VCO ADJ AM IF BF301 T301 CF301 TA7358AP MONO/ST T351 T352 FM IF IN FM DET AM IF FM+B FM DET MO/ST AM MIX FM/AM IF...
  • Page 13 CD-C452/C452C UNSWITCH FL701 DISPLAY MEMORY BACK UP MONO/ST 31 32 TO CD SECTION TO CD SECTION Q701 TO POWER SECTION PHM1 FM/AM SWITCHING Q343 SW701 AVDD SW730 IC701 AVREF IX0224AW XL701 SYSTEM CONTROL 4.19MHz MICROCOMPUTER TO CD SECTION VOLTAGE RESET...

  • Page 14: Schematic Diagram / Wiring Side Of P.w.board

    CD-C452/C452C 0.01 KTA1266 GR 1.5V 4.8V 0.01 4.2V + – 2.4V FIN2 + – + – 2.4V FIN1 2.5V EFBAL – + – – 2.5V FOSTA 2.5V + – DGND 2.5V TOSTA 2.4V – 2FREQ + – CNP1 0.1/50 2.4V LASER 0.033...
  • Page 15 CD-C452/C452C CD SECTION R57 1K R61 1K R62 1K R63 1K 0.01 64 63 62 59 58 57 55 54 53 52 51 50 EFLG 2.2V SUB-CODE SBSY U-COM DEF1 INTERFACE XVSS 2.1V X-TAL 2.2V 3.3M XOUT GENERATOR 2KX8 0.047...
  • Page 16 CD-C452/C452C P22 6-D TO TUNER & DECK SECTION 11 12 16 17 13 14 CNS11 M_12V 7.3V D_GND L-CH A_GND R-CH BI601 FW601 R518 TAPE REC TAPE BIAS T1/T2 R519 R401 1K R402 1K HP_SW R403 1K L-CH A_GND C549 100P...
  • Page 17 CD-C452/C452C MAIN PWB-A1(1/2) FM SIGNAL PLAYBACK SIGNAL RECORD SIGNAL CD SIGNAL JK601 R601 L-CH R603 C647 C401 220P 1.8K 390P C402 220P VIDEO/AUX C403 220P R604 C648 1.8K 390P R-CH R487 R602 100K C660 2.2/50 C481 C477 C659 REAR OUT 2.2/50...
  • Page 18 CD-C452/C452C DISPLAY FL701 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 24.2V 4.2V 24.2V R788 D710 1SS133...
  • Page 19 CD-C452/C452C CNS12 BI702 RWC(DSP) WRQ(DSP) CO IN(DSP) SQ OUT(DSP) CQ CK(DSP) RES(DSP) DRF(ASP) CNP12 D_GND TO CD SERVO PWB SLD+ P15 7-G SLD– PUIN SW OPEN/CLOSE R798 DISC NO. UP/DOWN SWITCH PWB-A3 RD05 RD06 RD07 RD08 RD01 RD02 RD03 RD04 3.9K...
  • Page 20 CD-C452/C452C 2 Ch IC901 STK40704 POWER AMP. C923 R921 C915 C904 C916 C911 R912 10/50 100/50 C912 C907 100/50 10/50 R913 C901 R905 1/50 C903 R907 1/50 H:ON 30.6V 30.7V L:OFF Q902 R914 KRC107 M Q901 KTA1268 GR 3.8V R911 Q903 0.3V...
  • Page 21 CD-C452/C452C FM SIGNAL R969 (1/2W) C978 47/50 D903 6.4V 1SS133 M901 FAN MOTOR R968 R967 F901 5A 250V F902 5A 250V C935 C937 (ML) (ML) H:ON L:OFF R934 R937 Q902 KRC107 M 3.8V Q903 0.3V KRC107 M SO901 SPEAKER TERMINAL...
  • Page 22 CD-C452/C452C MAIN PWB-A1(2/2) AM LOOP ANT FM ANT CNP301 IC301 BAND PASS TA7358AP AM ANT FILTER R321 FM FRONT END 1 2 3 4 5 6 7 8 9 BF301 C337 1 2 3 TP302 10/50 R306 C319 C314 0.022...
  • Page 23 CD-C452/C452C IC501 IC601 IC701 IC301 PIN VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE VOLTAGE 2.4V 2.5V 4.7V –24V 0.8V 2.4V 2.5V 1.6V 4.7V –24V 2.5V 5.8V 4.7V 4.9V –24V 2.5V 2.5V 4.7V 4.8V –24V 4.2V...
  • Page 24 CD-C452/C452C DISPLAY PWB-A2 JK701 HEADPHONE MAIN PW SW721 SW722 SW723 SW724 Q703 TUNER/BAND TAPE VIDEO/AUX B C E R789 C731 C730 ZD710 D710 R791 R790 R792 SW716 TUNING DOWN SW718 CLOCK C722 SW717 POWER R781 R737 SW715 SWITCH 1 2 3...
  • Page 25 CD-C452/C452C FM ANTENNA AM LOOP ANTENNA 1 2 3 MAIN PWB-A1 1 2 3 CHASSIS CNP301 C695 C395 BF301 T302 1 2 3 JK601 D303 D302 L302 L303 R601 R489 C482 R320 C310 C474 C481 R303 R482 R323 C484 R487...
  • Page 26 CD-C452/C452C SWM3 F. P. CNSM1 CNPM1 TO DISPLAY PWB FWM2 P24 5-D FWM1 PHM1 SWM4 CNPM2 F. A. S SOLM1 TAPE MECHANISM SOLENOID (254-8) PWB-D SWM5 TAPE 2 TAPE MOTOR(254-7) TAPE 1 RECORD/PLAYBACK ERASE HEAD(254-5) PLAYBACK HEAD(254-6) HEAD(254-6) POWER PWB-B...
  • Page 27 CD-C452/C452C CNS5 MECHA UP DISC NUMBER SENSOR PWB-F OPEN/CLOSE T/T UP/DOWN LOADING CNS10 SOLENOID SOLM2 CD MOTOR PWB-E SLED MOTOR PICK UP IN M901 FAN MOTOR CNS3A CNS3B CNS804 DISC MOTOR PICKUP UNIT(306) CNS1A CNS1B CNS2A CNS2B CD SERVO PWB-C...

  • Page 28: Function Table Of Ic

    CD-C452/C452C FUNCTION TABLE OF IC IC401 VHIQS7777PF-1:Q-Sound (QS7777PF) Pin No. Terminal Name Input/Output Function VREFOUT Output Buffered reference voltage output (Vcc/2) VREFIN Input Reference voltage input (Biased to Vcc/2 internally) MSC3 Input Capacitor MSC2 Input Capacitor MSC1 Input Capacitor —...
  • Page 29 CD-C452/C452C IC401 VHIQS7777PF-1:Q-Sound (QS7777PF) 36 35 34 33 32 31 30 29 28 27 26 25 QXAC4 QXDC2 QXDC3 QXAC3 QXDC4 QXAC2 FLIN QXAC1 FRIN FLOUT FROUT QS7777PF COUT SUBIN RLIN RLOUT RRIN RROUT MSC4 MSC5 MSC6 9 10 11 12...
  • Page 30 CD-C452/C452C IC701 RH-iX0224AWZZ:System Microcomputer (IX0224AW) (1/2) Function Pin No. Port Name Terminal Name Input/Output FIP6-0 FL DRIVER Output Segment Output — Connect with BACK UP VDD TAPE BIAS Output TAPE BIAS ON: H TAPE REC Output TAPE REC. ON:L T1/T2...
  • Page 31 CD-C452/C452C IC701 RH-iX0224AWZZ:System Microcomputer (IX0224AW) (2/2) Pin No. Port Name Function Terminal Name Input/Output P124 TAPE1 RUN PULSE Input TAPE1 Run pluse P123 TAPE MECHA STOP Input Tape mecha up state: L 58-60 P122-P120 Q-SOUND•VIRTUAL• Output LED drive output PROLOGIC...
  • Page 32 CD-C452/C452C MEMO – 32 –...

  • Page 33: Parts Guide

    “HOW TO ORDER REPLACEMENT PARTS” To have your order filled promptly and correctly, please furnish the For U.S.A. only following information. Contact your nearest SHARP Parts Distributor to order. 1. MODEL NUMBER 2. REF. No. 3. PART NO. 4. DESCRIPTION For location of SHARP Parts Distributor, Please call Toll-Free;...

  • Page 34: Troubleshooting (Cd Changer Control / Cd Section)

    CD-C452/C452C PRICE PRICE PART CODE DESCRIPTION PARTS CODE DESCRIPTION RANK RANK INTEGRATED CIRCUITS ZD351 VHEMTZJ5R1B-1 AC Zener,5.1V,MTZJ5.1B ZD401 VHEMTZJ5R1B-1 AC Zener,5.1V,MTZJ5.1B VHILA9241M/-1 AS Servo Amp.,LA9241M ZD701 VHEMTZJ3R3B-1 AA Zener,3.3V,MTZJ3.3B VHILC78623D-1 AY Servo/Signal Control,LC78623D ZD710 VHEMTZJ5R6B-1 AD Zener,5.6V,MTZJ5.6B VHIM56748FP-1 AR Focus/Tracking/Spin/Slide...
  • Page 35 CD-C452/C452C PRICE PRICE DESCRIPTION DESCRIPTION PART CODE PARTS CODE RANK RANK C44~49 VCKYMN1HB101K J AA 100 pF,50V C423 VCEAZA1HW475M J AB 4.7 µF,50V,Electrolytic VCTYMN1EF223Z AA 0.022 µF,25V C425 VCQYKA1HM102K J AA 0.001 µF,50V,Mylar C426 VCQYKA1HM123K J AA 0.012 µF,50V,Mylar C51,52 VCEAZA1CW107M J AC 100 µF,16V,Electrolytic...
  • Page 36 CD-C452/C452C PRICE PRICE PART CODE DESCRIPTION PARTS CODE DESCRIPTION RANK RANK C649~656 VCQYKA1HM473K J AB 0.047 µF,50V,Mylar R21,22 VRD-MN2BD223J AA 22 kohms,1/8W C657,658 VCKYMN1HB101K J AA 100 pF,50V VRD-MN2BD103J AA 10 kohm,1/8W C659,660 VCEAZA1HW225M J AB 2.2 µF,50V,Electrolytic VRD-MN2BD473J AA 47 kohms,1/8W...
  • Page 37 CD-C452/C452C PRICE PRICE DESCRIPTION DESCRIPTION PART CODE PARTS CODE RANK RANK R312 VRD-MN2BD681J AA 680 ohms,1/8W R687,688 VRD-ST2CD123J AA 12 kohms,1/6W R314 VRD-MN2BD103J AA 10 kohm,1/8W R689,690 VRD-ST2CD102J AA 1 kohm,1/6W R691,692 VRD-ST2CD272J AA 2.7 kohms,1/6W R316 VRD-MN2BD472J AA 4.7 kohms,1/8W...

  • Page 38: Qsound And The Qlogo Are Registered Trademarks Of Function Table Of Ic

    CD-C452/C452C PRICE PRICE PART CODE DESCRIPTION PARTS CODE DESCRIPTION RANK RANK R903 VRD-ST2CD104J AA 100 kohm,1/6W CNS804 QCNWN1200AWZZ J AD Connector Ass’y.,2Pin R904 VRD-ST2CD683J AA 68 kohms,1/6W F802,803 92LFUSE-T402D AD Fuse,4A/125V R905 VRD-ST2CD102J AA 1 kohm,1/6W F805 92LFUSE-T162-D AD Fuse,1.6A/250V...
  • Page 39 AM Cabinet,CD Player Base 254- 3 NBLTK0030AWZZ AC Belt,Sub GCAB-1050AWSA AP Top Cabinet 254- 4 NROLY0002AWZZ J AF Pinch Roller Ass’y. GITAR0330AWSA AS Back Board [CD-C452] 254- 5 RHEDA0001AWZZ J AG Head,Erase GITAR0349AWSA Back Board [CD-C452C] 254- 6 92LMRPH1746A AM Haed,Record/Playback LANGF0039AWFW1 J...
  • Page 40 Speaker 92L720TPC46200 Packing Add.,Top,Front Speaker RRMCG0143AWSA J AX Remote Control,with Polyethylene Bag 92LLID1782A AQ Battery Lid,Remote Control ACCESSORIES (FOR CD-C452 U.S.A ONLY) QACCD0010AW00 J AR AC Power Cord QANTL0004AWZZ J AG FM/AM Loop Antenna TINSE0214AWZZ AF Operation Manual TINSZ0328AWZZ AB Quick Guide...
  • Page 41 CD-C452/C452C CD-C452/C452C 306-2 306-1 306-3 305x2 PWB-E Figure 8 CD MECHANISM EXPLODED VIEW – 9 – – 8 –...
  • Page 42 CD-C452/C452C CD-C452/C452C 249-1 604x2 619x11 PWB-A1 619x2 249-2 615x9 613x2 PWB-A2 615x3 PWB-A3 244-2 M901 244-7 FL701 244-5 244-1 608x2 244-6 244-11 244-9 244-10 244-4 615x5 244-16 244-15 244-14 244-8 (254-1,254-2, 254-3,254-4, 617x2 254-5,254-6, 244-13 254-7,254-8) 244-12 TAPE MECHANISM 618x2...
  • Page 43 CD-C452/C452C CD-C452/C452C 257-3 257-2 614x2 257-1 251-2 614x2 251-1 251-3 236x2 MECHANISM 609x2 612x4 PWB-C PWB-F SOLM2 Figure 10 CABINET EXPLODED VIEW (2/2) – 11 – – 10 –...

  • Page 44: Fl Display

    CD-C452/C452C CP-C452 SUPER TWEETER TWEETER SP3 (L-CH) SP5 (L-CH) SP4 (R-CH) SP6 (R-CH) BLACK Capacitor YELOW (SP5,6) BLACK WOOFER 907x2 SP1 (L-CH) SP2 (R-CH) 903x2 Capacitor 903x2 SP3,4 907x2 SP1,2 906x4 SUPER TWEETER SP5 (L-CH) SP6 (R-CH) TWEETER SP3 (L-CH)

  • Page 45: Packing Of The Set (For U.s.a. Only)

    CD-C452/C452C PACKING OFF THE SET (For U.S.A. Only) Setting position of switches and knobs Tape Mechanism STOP Unit SPAKP0013AWZZ1 SPAKA0192AWZZ Polyethylene Bag Packing Add.,(Left/Right) FM/AM Loop Antenna BUTTON SIDE Quik Guide Operation Manual AC Power Cord Remote Control 92LBAG1460C1 Polyethylene Bag,...
  • Page 46 CD-C452/C452C MEMO – 13 – – 14 –...
  • Page 47 CD-C452/C452C MEMO – 15 – – 14 –...
  • Page 48 CD-C452/C452C © COPYRIGHT 1998 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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