Lenovo ThinkCentre A55 8705 Parts list manual

Hardware Replacement Guide
Ty pe s 9300, 9301, 9636, 9638, 9640
Ty pe s 9641, 9642, 9643, 9644, 9645

Hardware Replacement Guide
Ty pe s 9300, 9301, 9636, 9638, 9640
Ty pe s 9641, 9642, 9643, 9644, 9645

Third Edition (April 2007)
©Copyright Lenovo 2005, 2007.
Portions ©Copyright International Business Machines Corporation 2005.
All rights reserved.
U.S. GOVERNMENT USERS –RESTRICTED RIGHTS: Our products and/or services are provided with
RESTRICTED RIGHTS. Use, duplication or disclosure by the Government is subject to the GSA ADP Schedule
contract with Lenovo Group Limited, if any, or the standard terms of this commercial license, or if the agency is
unable to accept this Program under these terms, then we provide this Program under the provisions set forth in
Commercial Computer Software–Restricted Rights at FAR 52.227-19, when applicable, or under Rights in
Data-General, FAR 52.227.14 (Alternate III).

Contents
Overview ..............v
Safety information ............v
Additional information resources .......v
Tools required .............vi
Handling static-sensitive devices .......vi
Chapter 1. Locations .........1
Locating components ...........1
Locating controls and connectors on the front of your
computer ...............2
Locating connectors on the rear of your computer ..3
Identifying parts on the system board ......4
Chapter 2. Replacing hardware.....5
Opening the cover ............5
Replacing the power supply assembly ......6
Replacing the system board .........8
Replacing the heat sink ..........14
Replacing ahard disk drive .........15
Replacing an optical drive .........18
Replacing the diskette drive .........20
Replacing amemory module ........21
Replacing aPCI adapter ..........23
Replacing the fan assembly .........25
Replacing the internal speaker ........27
Replacing the keyboard ..........29
Replacing the mouse ...........29
Completing the parts replacement .......30
Updating (flashing) BIOS from adiskette or
CD-ROM ...............31
Appendix. Notices..........33
Television output notice ..........34
Trademarks ..............34
©Lenovo 2005, 2007. Portions ©IBM Corp. 2005. iii

iv Hardware Replacement Guide

Overview
This guide is intended to be used by customers who are replacing Customer
Replaceable Units (CRUs) as well as trained service personnel who are replacing
Field Replacement Units (FRUs). In this guide, CRUs will often be referred to as
parts.
This guide does not include procedures for all parts. It is expected that cables,
switches, and certain mechanical parts can be replaced by trained service personnel
without the need for step-by-step procedures.
Note: Use only the parts provided by Lenovo
™
.
This guide contains instructions for replacing the following parts:
vPower supply
vSystem board
vHeat sink
vHard disk drive
vOptical drive
vDiskette drive
vMemory modules
vPCI adapter
vFan assembly
vInternal speaker
vKeyboard
vMouse
Safety information
Do not open your computer or attempt any repair before reading the “Important
safety information” in the Safety and Warranty Guide that was included with your
computer. If you no longer have this copy of the Safety and Warranty Guide,you
can obtain one online from the Support Web site at
http://www.lenovo.com/support.
Additional information resources
If you have Internet access, the most up-to-date information for your computer is
available from the World Wide Web.
You can find the following information:
vCRU removal and installation information
vCRU removal and installation videos
vPublications
vTroubleshooting information
vParts information
vDownloads and drivers
vLinks to other useful sources of information
©Lenovo 2005, 2007. Portions ©IBM Corp. 2005. v

vSupport phone list
To access this information, point your browser to:
http://www.lenovo.com/support
Tools required
To replace some parts in your computer, you might need aflat-blade or Phillips
screwdriver. Additional tools might be needed for certain parts.
Handling static-sensitive devices
Static electricity, although harmless to you, can seriously damage computer
components and parts.
When you are replacing apart, do not open the static-protective package
containing the new part until the defective part has been removed from the
computer and you are ready to install the new part.
When you handle parts and other computer components, take these precautions to
avoid static-electricity damage:
vLimit your movement. Movement can cause static electricity to build up around
you.
vAlways handle parts and other computer components carefully. Handle
adapters, memory modules, system boards, and microprocessors by the edges.
Never touch any exposed circuitry.
vPrevent others from touching the parts and other computer components.
vBefore you replace anew part, touch the static-protective package containing the
part to ametal expansion-slot cover or other unpainted metal surface on the
computer for at least two seconds. This reduces static electricity in the package
and your body.
vWhen possible, remove the new part from the static-protective packaging, and
install it directly in the computer without setting the part down. When this is
not possible, place the static-protective package that the part came in on a
smooth, level surface and place the part on it.
vDo not place the part on the computer cover or other metal surface.
vi Hardware Replacement Guide

Chapter 1. Locations
This chapter provides illustrations to help locate the various connectors, controls,
and components of the computer. To open the computer cover, see “Opening the
cover” on page 5.
Locating components
The following illustration will help you locate the various components in your
computer.
1 Diskette drive lock 7 Internal speaker
2 Microprocessor and heat sink 8 Hard disk drive
3 Memory connectors (2) 9 Optical drive (such as aCD or
DVD drive)
4 Battery 10 Optical drive lock
5 PCI riser assembly 11 Diskette drive
6 Power supply assembly
©Lenovo 2005, 2007. Portions ©IBM Corp. 2005. 1

Locating controls and connectors on the front of your computer
The following illustration shows locations of the controls and connectors on the
front of your computer.
Note: Not all computer models will have the following controls and connections.
1 Optical drive (some models) 5 USB connectors (2)
2 Hard disk drive activity indicator 6 Microphone connector
3 Power-on indicator 7 Headphone connector
4 Power button 8 Diskette drive (some models)
2Hardware Replacement Guide