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1. GENERAL INFORMATION .............................. 5
1-1 FEATURES ................................................. 5
1-2 SPECIFICATIONS ..................................... 5
AND CONTROL ......................................... 6
SHARP CORPORATION
SERVICE MANUAL
MODEL
In the interests of user-safety (Required by safety regulations in some
countries) the set should be restored to its original condition and only parts
identical to those specified should be used.
CONTENTS
Page
3. ELECTRICAL ADJUSTMENT .......................... 9
4. TROUBLESHOOTING .................................. 12
5. BLOCK DIAGRAM .......................................... 22
PATTERN ....................................................... 32
7. REPLACEMENT PARTS LIST ....................... 45
8. EXPLODED VIEWS ....................................... 55
9. PACKING OF THE SET ................................. 59
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
1
VIDEO CASSETTE RECORDER
VC-H9888U
VC-H9888U
SX8Z5VCH9888U
Page

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Summary of Contents for Sharp VC-H9888U

  • Page 1: Table Of Contents

    VC-H9888U SERVICE MANUAL SX8Z5VCH9888U VIDEO CASSETTE RECORDER VC-H9888U MODEL In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified should be used.
  • Page 2 VC-H9888U IMPORTANT SERVICE NOTES part. Any reading of 0.45V rms (this corresponds to 0.3mA rms BEFORE RETURNING THE VIDEO CASSETTE AC.) or more is excessive and indicates a potential shock RECORDER hazard which must be corrected before returning the video cassette recorder to the owner.
  • Page 3 VC-H9888U NOTES DE SERVICE IMPORTANTES entre la résistance. Inverser la fiche CA (une fiche intermédiaire AVANT DE RENDRE LE MAGNETOSCOPE non polarisée doit être utilisée à seule fin de faire ces vérifications.) sur l’appareil et répéter les mesures de tension Avant de rendre le magnétoscope à...
  • Page 4 VC-H9888U PRECAUTIONS IN PART REPLACEMENT When servicing the unit with power on, be careful to the section marked white all over. This is the primary power circuit which is live. When checking the soldering side in the tape travel mode, make sure first that the tape has been loaded and then turn over the PWB with due care to the primary power circuit.
  • Page 5: General Information

    • Ruminus Universal Remote Control • 20 seconds Timer Back-up • Gamma Function • Sharp Super Picture • Field-Still / Variable Slow / Frame Advance 1-2 SPECIFICATIONS 1) Recording system Format: VHS NTSC standard Luminance signal: FM recording Chroma signal: Low frequency converted direct recording...
  • Page 6: Location Of Major Components And Control

    VC-H9888U 1-3 LOCATION OF MAJOR COMPONENTS AND CONTROL...
  • Page 7: Disassembly And Reassembly

    VC-H9888U 2. DISASSEMBLY AND REASSEMBLY 2-1. DISASSEMBLY OF MAJOR BLOCKS TOP CABINET : Remove 4 screws 1. MECHANISM / : Undo the 3 hooks each of the front left- FRONT PANEL : Remove 2 screws 2 and 7 clips 3.
  • Page 8: Cares When Reassembling

    VC-H9888U 2-2. CARES WHEN REASSEMBLING INSTALLING THE CASSETTE CONTROLLER cassette controller. (Conditions: When mechanism and When the cassette controller is installed on the mecha- PWB have been installed) nism, the initial setting is essential condition. There are two initial setting methods, namely electrical 2.
  • Page 9: Electrical Adjustment

    VC-H9888U 3. ELECTRICAL ADJUSTMENT Notes: • Before the adjustment: Electrical adjustments discussed here are often required after replacement of electronic components and mechanical parts such as video heads. Check that the mechanism and all electric components are in good working condition prior to the adjustments,otherwise adjustments can not be completed.
  • Page 10 VC-H9888U SERVO CIRCUIT ADJUSTMENT 3-2 ADJUSTMENT OF SLOW TRACKING PRESET 3-1 ADJUSTMENT OF HEAD SWITCHING Measuring Color TV monitor POINT instrument Measuring Dual-trace oscilloscope Mode Make recording on self-recording tape instrument in SP mode or EP mode. Play it back.
  • Page 11 VC-H9888U 1. Input commercial broadcast or video signal to video input terminal. 2. Make recording on self-recording tape in SP mode. Play it back. 3. Press the PAUSE/STILL button to freeze the picture. 4. Look at the monitor screen and adjust (') or (") TRACKING/CHANNEL select buttons so that the ver- tical jitter of the picture is minimized.
  • Page 12: Troubleshooting

    VC-H9888U...
  • Page 13 VC-H9888U...
  • Page 14 VC-H9888U...
  • Page 15 VC-H9888U...
  • Page 16 VC-H9888U...
  • Page 17 VC-H9888U...
  • Page 18 VC-H9888U...
  • Page 19 VC-H9888U...
  • Page 20 VC-H9888U...
  • Page 21 VC-H9888U MEMO...
  • Page 22: Block Diagram

    VC-H9888U 5. BLOCK DIAGRAMS SERVO BLOCK DIAGRAM * VOLTAGE MEASUREMENT MODE Parentheses ( Without Parentheses...
  • Page 23 VC-H9888U...
  • Page 24 VC-H9888U SIGNAL FLOW BLOCK DIAGRAM PB Lum REC Lu * VOLTAGE MEASUREMENT MODE Parentheses ( Without Parentheses...
  • Page 25 VC-H9888U Audio Playback Signal E-E Signal PB Luminance Signal PB Chrominance Signal Audio E-E Signal REC Chrominance Signal Audio Record Signal REC Luminance Signal...
  • Page 26 VC-H9888U GAMMA BLOCK DIAGRAM * VOLTAGE MEASUREMENT MODE Parentheses ( Without Parentheses...
  • Page 27 VC-H9888U...
  • Page 28 VC-H9888U POWER CIRCUIT BLOCK DIAGRAM * VOLTAGE MEASUREMENT MODE Parentheses ( Without Parentheses...
  • Page 29 VC-H9888U...
  • Page 30 VC-H9888U * VOLTAGE MEASUREMENT MODE Parentheses ( Without Parentheses...
  • Page 31 VC-H9888U SCHEMATIC DIAGRAM • The indicated voltages in the following diagram IMPORTANT SAFETY NOTICE: are measured with an SSVM, upon receiving color bars (400 Hz sound signal) in either the PARTS MARKED WITH " å " ( ) ARE record mode or the play mode voltage is indi- IMPORTANT FOR MAINTAINING THE SAFETY cated as follows.
  • Page 32: Circuit Diagram And Pwb Foil Pattern

    VC-H9888U 9. CIRCUIT DIAGRAM AND PWB FOIL PATTERN MAIN CIRCUIT (1) * VOLTAGE MEASUREMENT MODE Parentheses ( Without Parentheses...
  • Page 33 VC-H9888U...
  • Page 34 VC-H9888U MAIN CIRCUIT (2) * VOLTAGE MEASUREMENT MODE Parentheses ( Without Parentheses...
  • Page 35 VC-H9888U...
  • Page 36 VC-H9888U MAIN CIRCUIT (3) * VOLTAGE MEASUREMENT MODE Parentheses ( Without Parentheses...
  • Page 37 VC-H9888U...
  • Page 38 VC-H9888U MAIN CIRCUIT (4) * VOLTAGE MEASUREMENT MODE Parentheses ( Without Parentheses...
  • Page 39 VC-H9888U...
  • Page 40 VC-H9888U GAMMA CIRCUIT * VOLTAGE MEASUREMENT MODE Parentheses ( Without Parentheses...
  • Page 41 VC-H9888U...
  • Page 42 VC-H9888U MAIN PWB * VOLTAGE MEASUREMENT MODE Parentheses ( Without Parentheses...
  • Page 43 VC-H9888U...
  • Page 44 VC-H9888U OPERATION PWB FRONT AV PWB GAMMA PWB FRONT AV JACK PWB * VOLTAGE MEASUREMENT MODE Parentheses ( Without Parentheses...
  • Page 45: Replacement Parts List

    VC-H9888U 7.PARTS LIST LISTE DES PIECES Ref. No. Part No. Description Code Ref. No. Part No. Description Code PARTS REPLACEMENT CHANGE DES PIECES De nombereuses pièces électriques et mécaniques de magnétoscopes Many electrical and mechanial parts in video cassette recorder have présentent des caractéristiques particulières de sécurité.
  • Page 46 VC-H9888U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK5610TEV2 D965 VHDRL1N4004-1 V RL1N4004 D966 VHDRL1N4004-1 V RL1N4004 Main Unit (Continued) D967 VHDRL1N4004-1 V RL1N4004 D991 RH-EX0631GEZZ V Zener Diode Q603 VS2SC3203Y/-1 V 2SC3203Y D992 RH-DX0475CEZZ V Diode å...
  • Page 47 VC-H9888U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK5610TEV2 C518 VCKYCY1HF333Z V 0.033 50V Ceramic C521 VCKYCY1HF103Z V 0.01 50V Ceramic Main Unit (Continued) C522 VCKYD41CY103N V 0.01 16V Ceramic C523 VCKYD41CY103N V 0.01 16V Ceramic...
  • Page 48 VC-H9888U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK5610TEV2 R107 VRS-CY1JF822J V 8.2k 1/16W Metal Oxide AA R108 VRS-CY1JF103J V 10k 1/16W Metal Oxide AA Main Unit (Continued) R109 VRS-CY1JF561J V 560 1/16W Metal Oxide AA...
  • Page 49 VC-H9888U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK5610TEV2 R736 VRS-CY1JF183J V 18k 1/16W Metal Oxide AA R737 VRS-CY1JF102J V 1k 1/16W Metal Oxide AA Main Unit (Continued) R738 VRD-RA2BE104J V 100k 1/8W Carbon R739...
  • Page 50 VC-H9888U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK5610TEV2 DUNTK5611TEV2 Main Unit (Continued) OPERATION Unit å R931 VRS-CY1JF103J V 10k 1/16W Metal Oxide AA RESISTORS å R933 VRS-CY1JF103J V 10k 1/16W Metal Oxide AA R882 VRD-RA2BE222J V 2.2k 1/8W Carbon...
  • Page 51 VC-H9888U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK5613TEV2 C422 VCQYWA1HA102J V 1000p 50V Mylar C423 VCKYCY1CF104Z V 0.1 16V Ceramic GAMMA Unit C424 VCEA9M1CW476M V 47 16V Electrolytic C425 VCEA9M1CW106M V 10 16V Electrolytic...
  • Page 52 VC-H9888U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK5613TEV2 MECHANISM CHASSIS PARTS GAMMA Unit (Continued) R437 VRS-CY1JF472J V 4.7k 1/16W Metal Oxide AA LBNDK1011AJZZ V Tension Band Ass’y R438 VRS-CY1JF101J V 100 1/16W Metal Oxide AA...
  • Page 53 VC-H9888U Ref. No. Part No. Description Code Ref. No. Part No. Description Code MECHANISM CHASSIS PARTS CASSETTE HOUSING CONTROL PARTS (Continued) XBPSD26P05J00 V Drum Drive Motor CHLDX3081TEV2 V Cassette Housing Control AX Mounting Screw Ass'y (SW2.6P+5S) LANGF9592AJFW V Upper Plate...
  • Page 54 SSAKP0030AJZZ - Polyethylene Bag — TLABK0005AJZZ - No. Card — CPNLC2495TEV1 V Front Panel Ass'y 501-2 HBDGB3019AJSB V SHARP Badge 501-3 HDECQ1939AJSA V Cassette Flap 501-4 HDECQ1914AJSA V Cassette Flap Dec. 501-5 HDECQ1940AJSA V Window Dec. 501-6 JBTN-2920AJSA V STOP Button...
  • Page 55: Exploded Views

    VC-H9888U 8 EXPLODED VIEW Ref. No. Part No. Description Code Ref. No. Part No. Description Code MECHANISM CHASSIS EXPLODED VIEW...
  • Page 56 VC-H9888U CASSETTE HOUSING CONTROL EXPLODED VIEW Ref. No. Part No. Description Code Ref. No. Part No. Description Code...
  • Page 57 VC-H9888U MECHANICAL EXPLODED VIEW Ref. No. Part No. Description Code Ref. No. Part No. Description Code...
  • Page 58 VC-H9888U FRONT PANEL EXPLODED VIEW Ref. No. Part No. Description Code Ref. No. Part No. Description Code 501-14 501-3 501-12 501-4 501-10 501-13 501-11 501-4 501-8 501-7 501-6 501-2 501-9 501-5 PRECAUTION ON FRONT PANEL SET-UP Cassette cover Front panel...
  • Page 59: Packing Of The Set

    VC-H9888U 8. PACKING OF THE SET Ref. No. Part No. Description Code Ref. No. Part No. Description Code Setting of the Knobs RF conv. CH. preset at "3" channel Accessories TiNS-3487AJZZ Operation Manual TCADH0047AJZZ Operation Guide SSAKA0001AJZZ Polyethylene Sack RRMCG0287AJSA...
  • Page 60 Code Ref. No. Part No. Description Code 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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