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IBM Mobile Systems ThinkPad Computer Hardware Maintenance Manual September 2003 This manual supports: ThinkPad A30, A30p, A31, A31p (MT 2652/2653/2654) ThinkPad Dock (MT 2631) Note Before using this information and the product it supports, be sure to read the general information under "Notices" on page 186. Second Edition (September 2003) The following paragraph does not apply to the United Kingdom or any country where such provisions are inconsistent with local law: INTERNATIONAL BUSINESS MACHINES CORPORATION PROVIDES THIS PUBLICATION "AS IS" WITHOUT ANY WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE LIMITED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do not allow disclaimer or express or implied warranties in certain transactions; therefore, this statement may not apply to you. This publication could include technical inaccuracies or typographical errors. Changes are periodically made to the information herein; these changes will be incorporated in new editions of the publication. IBM may make improvements or changes to the products or the programs described in this publication at any time. It is possible that this publication may contain references to, or information about, IBM products (machines and programs), programming, or services that are not announced in your country. Such references or information must not be construed to mean that IBM intends to announce such IBM products, programming, or services in your country. Requests for technical information about IBM products should be made to your IBM authorized dealer or your IBM marketing representative. © Copyright International Business Machines Corporation 2003. All rights reserved. US Government Users Restricted Rights ­ Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . 3 . 3 . 3 . 4 . 4 . 4 . 16 . 16 . 17 . 18 Introduction . . . . . . . . Important service information . . . . Strategy for replacing FRUs . . . How to use error messages . . . Diskette compatibility matrix . . . . Safety notices: multilingual translations . Safety information. . . . . . . General safety . . . . . . . Electrical safety . . . . . . Safety inspection guide . . . . Handling devices that are sensitive to discharge . . . . . . . Grounding requirements . . . . Laser compliance statement. . . . General descriptions . . . . Read this first . . . . . . . What to do first . . . . . Related service information . . . Service web site . . . . . Restoring the preloaded system Passwords . . . . . . . Power management . . . . Checkout guide . . . . . . Testing the computer . . . . Detecting system information with Power system checkout . . . ThinkPad A30, A30p, A31, A31p Product overview . . . . . Specifications . . . . . Status indicators . . . . FRU Tests . . . . . . Fn key combinations . . . Symptom-to-FRU in