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Sharp 25WG3 Service Manual
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Sharp 25WG3 Service Manual

Sharp 25WG3 Service Manual

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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 be used.
• FEATURE ............................................................ 2
• SPECIFICATIONS ...............................................2
• IMPORTANT SERVICE NOTES ......................... 3
• ADJUSTMENT PRECAUTIONS ......................... 3
• SERVICE MODE .................................................. 4
• SERVICE ADJUSTMENT ................................... 7
• TROUBLESHOOTING ...................................... 13
The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug and power
receptacle, when servicing this chassis.
To prevent electric shock, do not remove cover. No user-serviceable parts inside. Refer servicing to qualified
service personnel.

SERVICE MANUAL

MODEL
CONTENTS
Page
• WAVEFORMS ................................................... 15
• BLOCK DIAGRAM ............................................. 16
• CHASSIS LAYOUT ............................................22
• SCHEMATIC DIAGRAM ................................... 24
• PARTS LIST ...................................................... 37
WARNING

SHARP CORPORATION

1
COLOUR TELEVISION
Chassis No. SS-1
25WG3
25WG3
SY8A725WG3///
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  • Page 1: Table Of Contents

    25WG3 SERVICE MANUAL SY8A725WG3/// COLOUR TELEVISION Chassis No. SS-1 25WG3 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 be used.

  • Page 2: Feature

    25WG3...

  • Page 3: Important Service Notes

    25WG3...

  • Page 4: Service Mode

    25WG3...
  • Page 5 25WG3...
  • Page 6 25WG3...

  • Page 7: Service Adjustment

    25WG3...
  • Page 8 25WG3...
  • Page 9 25WG3...
  • Page 10 25WG3...
  • Page 11 25WG3...
  • Page 12 25WG3...

  • Page 13: Troubleshooting

    25WG3...

  • Page 14: Solid State Device Base Diagram

    25WG3...

  • Page 15: Waveforms

    25WG3 WAVEFORMS DESCRIPTION OF SCHEMATIC DIAGRAM SAFETY NOTES: 1. DISCONNECT THE AC PLUG FROM THE AC NOTES: OUTLET BEFORE REPLACING PARTS. 1. The unit of resistance "ohm" is omitted 2. SEMICONDUCTOR HEAT SINKS SHOULD BE (K: 1000 ohms M = Meg ohm).

  • Page 16: Block Diagram

    25WG3 BLOCK DIAGRAM MAIN 1 UNIT BLOCK DIAGRAM...
  • Page 17 25WG3...
  • Page 18 25WG3 MAIN 2 UNIT BLOCK DIAGRAM...
  • Page 19 25WG3...
  • Page 20 25WG3 CRT/FRONT/S-OUT UNIT BLOCK DIAGRAM...
  • Page 21 25WG3...

  • Page 22: Chassis Layout

    25WG3 CHASSIS LAYOUT...
  • Page 23 25WG3...

  • Page 24: Schematic Diagram

    25WG3 SCHEMATIC DIAGRAM MAIN 1 UNIT SCHEMATIC DIAGRAM...
  • Page 25 25WG3...
  • Page 26 25WG3 MAIN 2 UNIT SCHEMATIC DIAGRAM...
  • Page 27 25WG3...
  • Page 28 25WG3 CRT/FRONT/S-OUT UNIT SCHEMATIC DIAGRAM...
  • Page 29 25WG3...
  • Page 30 25WG3 TUNER SCHEMATIC DIAGRAM VTUVTST6HD64/ NOTE: The parts here shown are supplied as an assembly but not independently. REMOTE CONTROL UNIT SCHEMATIC DIAGRAM NOTE: The parts here shown are supplied as an assembly but not independently.
  • Page 31 25WG3 - M E M O -...

  • Page 32: Printed Wiring Board Assemblies

    25WG3 PRINTED WIRING BOARD ASSEMBLIES MAIN 1 UNIT...
  • Page 33 25WG3...
  • Page 34 25WG3 MAIN 2 UNIT (SIDE A) MAIN 2 UNIT (SIDE B) CRT UNIT...
  • Page 35 25WG3 FRONT UNIT S-OUT UNIT...
  • Page 36 25WG3 - M E M O - Ref. No. Part No. Description Code Ref. No. Part No. Description Code...

  • Page 37: Parts List

    25WG3 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PARTS LIST R1110 VRD-RA2BE223J R 22k 1/8W Carbon PARTS REPLACEMENT SWITCHES å S750 QSW-P0588CEZZ R Switch, Power Replacement parts which have these special safety characteristics S1101 QSW-K0079GEZZ R Switch, CH-Up are identified this manual;...
  • Page 38 25WG3 Ref. No. Part No. Description Code Ref. No. Part No. Description Code D604 RH-DX0475CEZZ R DX0475CE DUNTK9481WET3 S-OUT UNIT (Continude) D605 RH-DX0302CEZZ R DX0302CE D607 RH-DX0255CEZZ R DX0255CE R3309 VRD-RA2BE103J R 10k 1/8W Carbon D608 RH-DX0475CEZZ R DX0475CE R3310...
  • Page 39 25WG3 Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK9482WET9 MAIN 1 UNIT (Continude) C710 RC-KZ0016CEZZ R 0.01 1.5kVCeramic C711 RC-KZ0016CEZZ R 0.01 1.5kVCeramic C712 RC-KZ0016CEZZ R 0.01 1.5kVCeramic C337 VCQYTA1HM183J R 0.018 50V Mylar C713 RC-KZ0016CEZZ R 0.01...
  • Page 40 25WG3 Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK9482WET9 MAIN 1 UNIT (Continude) R1002 VRD-RA2BE103J R 10k 1/8W Carbon R1003 VRD-RA2BE562J R 5.6k 1/8W Carbon R1004 VRD-RA2BE103J R 10k 1/8W Carbon R432 VRD-RA2BE271J R 270 1/8W Carbon...
  • Page 41 25WG3 Ref. No. Part No. Description Code Ref. No. Part No. Description Code C404 VCEAGA1AW107M R 100 10V Electrolytic DUNTK9483WEW4 MAIN 2 UNIT (Continude) C405 VCEAGA1CW476M R 47 16V Electrolytic C406 VCEAGA1AW477M R 470 10V Electrolytic D1005 RH-EX0633GEZZ R Zener, EX0633GE C407 VCEAGA1HW475M R 4.7...
  • Page 42 25WG3 Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK9483WEW4 MAIN 2 UNIT (Continude) R1052 VRS-CY1JF561J R 560 1/16W Metal Oxide R1053 VRS-CY1JF561J R 560 1/16W Metal Oxide R1054 VRS-CY1JF472J R 4.7k 1/16W Metal Oxide R310 VRS-CY1JF332J R 3.3k 1/16W Metal Oxide...
  • Page 43 SSAKA0230CEZZ - Polyethylene Bag — CABINET PARTS CCABA0060WEA0 Front Cabinet Ass'y Not Available - Front Cabinet — (Not Replacement Item) HBDGB3119CESA R Badge, SHARP HDECQ0025KJSA LED Cover, R/C JBTN-0032KJSA Power Button JBTN-0033KJSA Control Button CCABB0039WEA0 Rear Cabinet Ass'y Not Available - Rear Cabinet —...
  • Page 44 Code Ref. No. Part No. Description Code COPYRIGHT C 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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