Manual Técnico Toshiba Satelite L20

Toshiba Personal Computer Satellite L20 Series Maintenance Manual

TOSHIBA CORPORATION
File Number 960-Q01

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Copyright © 2003 by Toshiba Corporation. All rights reserved. Under the copyright laws, this manual cannot be reproduced in any form without the prior written permission of Toshiba. No patent liability is assumed with respect to the use of the information containedherein. Toshiba Personal Computer Satellite L20 Series Maintenance Manual First edition October 2005 Disclaimer The information presented in this manual has been reviewed and validated for accuracy. The included set of instructions and descriptions are accurate for the Satellite L20 Series at the time of this manual's production. However, succeeding computers and manuals are subject to change withoutnotice. Therefore, Toshiba assumes no liability for damages incurred directly or indirectly from errors, omissions, or discrepancies between any succeeding product and this manual.

Trademarks Intel, Intel SpeedStep, Pentium and Celeron are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States and other countries/regions. Windows and Microsoft areregistered trademarks of Microsoft Corporation. Photo CD is a trademark of Eastman Kodak. i Link is a trademark of Sony Corporation. TruSurround XT, Trubass, Dialog Clarity, SRS and (•)symbol are trademarks of SRS Labs, Inc. TruSurround XT technology is in corporated under license from SRS Labs, Inc. Other trademarks and registered trademarks not listed above may be used in this manual.

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Preface
This maintenance manual describes how to perform hardware service maintenance for the Toshiba Personal Computer Satellite L20 Series. The procedures described in this manual are intended to help service technicians isolate faulty Field Replaceable Units (FRUs) and replace them in the field. SAFETY PRECAUTIONS Four types of messages areused in this manual to bring important information to your attention. Each of these messages will be italicized and identified as shown below. DANGER: “Danger” indicates the existence of a hazard that could result in death or serious bodily injury, if the safety instruction is not observed. WARNING: “Warning” indicates the existence of a hazard that could result in bodily injury, if the safetyinstruction is not observed. CAUTION: “Caution” indicates the existence of a hazard that could result in property damage, if the safety instruction is not observed. NOTE: “Note” contains general information that relates to your safe maintenance service. Improper repair of the computer may result in safety hazards. Toshiba requires service technicians and authorized dealers or service providers toensure the following safety precautions are adhered to strictly. Be sure to fasten screws securely with the right screwdriver. If a screw is not fully fastened, it could come loose, creating a danger of a short circuit, which could cause overheating, smoke or fire. If you replace the battery pack or RTC battery, be sure to use only the same model battery or an equivalent battery recommended byToshiba. Installation of the wrong battery can cause the battery to explode.

Satellite L20 Maintenance Manual (960-Q01)

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The manual is divided into the following parts: Chapter 1 Chapter 2 Chapter 3 Chapter 4 Appendices Hardware Overview describes the Satellite L20 system unit and each FRU. Troubleshooting Procedures explains how to diagnose and resolve FRU problems. Test andDiagnostics describes how to perform test and diagnostic operations for maintenance service. Replacement Procedures describes the removal and replacement of the FRUs. The appendices describe the following: Handling the LCD Module Board layout Pin assignments Keyboard scan/character codes Key layout Wiring diagrams BIOS Rewrite Procedures EC/KBC Rewrite Procedures Reliability

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Satellite L20...