ThinkPad Computer Hardware Maintenance Manual January 2006 This manual supports: ThinkPad X41 Tablet (MT 1866, 1867, 1869) ThinkPad X4 Dock (MT 2506) Note Before using this information and the product it supports, be sure to read the general information under “Notices” on page 133. First Edition (January 2006) © Copyright Lenovo 2006. Portions © Copyright International Business Machines Corporation 2006. All rights reserved. U.S. GOVERNMENT USERS – RESTRICTED RIGHTS: Our products and/or services Contents About this manual . . . . . . . . . . .1 Introduction . . . . . . . . . . . . .3 Important service information . . . . . . . . .3 Strategy for replacing FRUs . . . . Undetermined problems . . . . . . . . .67 FRU replacement notices . . . . . . . . .68 Screw notices . . . . . . . . . . . .68 Retaining serial numbers . . . . . . . . .69 About this manual This manual contains service and reference information for ThinkPad X41 Tablet (MT 1866/1867/1869) product. Use this manual along with the advanced diagnostic tests to troubleshoot problems. The manual is divided into sections as follows: v The common sections provide general information, guidelines, and safety information required