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Service Manual
ViewSonic PJ452-1
Model No. VS10948
LCD Projector
(PJ452-1_SM Rev. 1b Jun. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583
Copyright
Copyright 2006 by ViewSonic Corporation. All rights reserved. No part of this publication may be
reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or
computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical,
manual or otherwise, without the prior written permission of ViewSonic Corporation.
Disclaimer
ViewSonic makes no representations or warranties, either expressed or implied, with respect to the
contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular
purpose. Further, ViewSonic reserves the right to revise this publication and to make changes from time
to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or
changes.
Trademarks
Optiquest is a registered trademark of ViewSonic Corporation.
ViewSonic is a registered trademark of ViewSonic Corporation.
All other trademarks used within this document are the property of their respective owners.
Revision History
Revision SM Editing Date ECR Number Description of Changes Editor
1a 12/9/05 Initial Release BonnieT.
1b 6/1/06 VS-E060088 update RSPL BonnieT.
ViewSonic Corporation Confidential - Do Not Copy PJ452-1
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TABLE OF CONTENTS
1. Precautions and Safety Notices 1
2. Specification 2
3. Names of each part 3
4. Adjustment 5
5. Troubleshooting 11
6. Service points 16
7. Wiring diagram 30
8. Disassembly diagram 34
9. Replacement parts list 42
10. RS-232C commands 44
11. Block diagrams 52
12. Connector connection diagram 53
13. Basic dircuit diagram 54
ViewSonic Corporation Confidential - Do Not Copy PJ452-1
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1. Precautions and Safety Notices
1. When replacing the lamp, use care to avoid burns to your fingers. The lamp becomes very hot
during operation.
2. Never touch the lamp with your fingers as body oil transferred to the lamp can damage the
lamp's useful life.
3. Never drop the lamp or jar it in any manner. This may cause the lamp to burst.
4. This projector is provided with a high voltage circuit for the lamp. Do not touch any electric
part or component after the projector has been turned on and is operating. Doing so could
induce a severe shock causing injury or death.
5. Do not touch the exhaust fan, nor block its air flow, during operation, as the fan is hot.
6. The LCD module assembly can be easily damaged during service. If replacing the LCD
Lens/Prism assembly, do not hold the FPC of the LCD module assembly.
7. Use only the cables which are included with the projector, or are specified in this manual.
Warning
The technical information and parts shown in this
manual are not to be used for: the development,
design, production, storage or use of nuclear, chemical,
biological or missile weapons or other weapons of
mass destruction; or military purposes; or purposes that
endanger global safety and peace. Moreover, do not
sell, give, or export these items, or grant permission for
use to parties with such objectives. Forward all inquiries
to the SUPPLIER.
Caution
Be sure to read this manual before servicing. To assure safety from fire, electric shock, injury, harmful
radiation and materials, various measures are provided in this Multimedia LCD Projector. Be sure to
read cautionary items described in the manual to maintain safety before servicing.
Service Warning
1. When replace the lamp, to avoid burns to your fingers. The lamp becomes too hot.
2. Never touch the lamp bulb with a finger or anything else. Never drop it or give it a shock. They may
cause bursting of the bulb.
3. This projector is provided with a high voltage circuit for the lamp. Do not touch the electric parts of
power unit (main), when turn on the projector.
4. Do not touch the exhaust fan, during operation.
5. The LCD module assembly is likely to be damaged. If replacing to the LCD/PRISM assembly, do not
hold the FPC of the LCD module assembly.
6. Use the cables which are included with the projector or specified.
ViewSonic Corporation Confidential - Do Not Copy PJ452-1
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