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

Locating connectors on the rear of your computer
The following illustration shows locations of connectors on the rear of your
computer.
1 Power cord connector 9 Parallel connector
2 Cable lock latch 10 Serial connector
3 PCI Express x1 adapter connector 11 Mouse connector
4 PCI adapter connector 12 Keyboard
5 USB connectors (4) 13 Audio line out connector
6 Ethernet connector 14 Audio line in connector
7 USB connectors (2) 15 Voltage-selection switch (some models)
8 VGA monitor connector 16 Power supply diagnostic LEDs
Chapter 1. Locations 3

Identifying parts on the system board
The following illustration shows the locations of parts on the system board.
1 Memory connector 110 Internal speaker connector
2 Memory connector 211 Diskette drive connector
3 SATA IDE connectors (2) 12 Front panel connector
4 BIOS WP 13 Power supply connector
5 Cover presence switch (Tamper
SW) connector
14 12v power connector
6 PCI riser connector 15 Microprocessor and heat sink
7 Battery 16 Fan connector 2
8 Clear CMOS/Recovery jumper 17 Fan connector 1
9 Temperature sensor connector
4Hardware Replacement Guide

Chapter 2. Replacing hardware
Attention
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. To
obtain acopy of the Safety and Warranty Guide,go to the Support Web site at
http://www.lenovo.com/support.
Note: Use only parts provided by Lenovo.
Opening the cover
Important
Turn off the computer and wait 3to 5minutes to let the computer cool
before opening the computer cover.
To open the computer cover, do the following:
1. Remove any media (diskettes, CDs, or tapes) from the drives, shut down your
operating system, turn off all attached devices and the computer.
2. Unplug all power cords from electrical outlets.
3. Disconnect the cables attached to the computer. This includes power cords,
input/output (I/O) cables, and any other cables that are connected to the
computer. See “Locating controls and connectors on the front of your
computer” on page 2and “Locating connectors on the rear of your computer”
on page 3.
4. Remove any locking devices, such as acable lock that secure the computer
cover.
5. Press the buttons on the sides of the computer and pivot the cover upward to
open the computer as shown.
©Lenovo 2005, 2007. Portions ©IBM Corp. 2005. 5

Replacing the power supply assembly
Attention
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. To
obtain acopy of the Safety and Warranty Guide,go to the Support Web site at
http://www.lenovo.com/support.
To replace the power supply assembly, do the following:
1. Remove the four screws at the rear of the chassis that secure the power
supply.
2. Open the computer cover. See the “Opening the cover” on page 5.
3. Pivot the drive bay assembly upward to gain access to the system board.
4. Locate the power supply assembly. See “Locating components” on page 1.
6Hardware Replacement Guide

5. Disconnect the power supply cables 1and 2 from the system board
connectors and from all drives.
6. Remove the power supply cables from the cable clips and ties.
7. Slide the power supply assembly forward and remove it from the computer.
8. Install the new power supply assembly into the chassis so that the screw holes
in the power supply assembly align with those in the chassis.
Note: Use only the screws provided by Lenovo.
9. Install and tighten the four screws at the rear of the chassis to secure the
power supply assembly.
10. Reconnect all the power supply cables to the drives and the system board.
11. Go to “Completing the parts replacement” on page 30.
Chapter 2. Replacing hardware 7

Replacing the system board
Attention
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. To
obtain acopy of the Safety and Warranty Guide,go to the Support Web site at
http://www.lenovo.com/support.
To replace the system board, do the following:
1. Turn off the computer and allow the computer to cool for one hour.
2. Open the computer cover. See “Opening the cover” on page 5.
3. Pivot the drive bay assembly upward to gain access to the system board.
8Hardware Replacement Guide

4. While holding the rear of the computer chassis down, pull upward on the
handle provided to remove the PCI riser assembly and any adapters that are
currently installed.
5. Carefully take note of the location of all cable connections on the system
board. It will be necessary to reconnect them properly when installing anew
system board.
6. Disconnect all cables connected to the system board. See “Identifying parts on
the system board” on page 4.
Important
Note the cable routing. It is important to route the cables the same way
after you install the new system board.
Chapter 2. Replacing hardware 9

7. Pull upward on the handle 1to release the system board from the front
latch, slide the system board toward the drive bay assembly, and then
carefully lift the system board out of the chassis.
Note: You might have to tilt the front end of the system board between the
diskette drive and the fan assembly to remove it completely from the chassis.
8. Place the failing system board next to the new system board on aclean, flat
surface.
9. Remove all memory modules from the failing system board and install them
in the same connectors on the new system board. See “Replacing amemory
module” on page 21. Return here after installing the memory modules on the
new system board.
10 Hardware Replacement Guide

10. Remove the heat sink from the failing system board by pivoting the lever
1securing the heat sink until it is fully in the up position. Carefully lift the
heat sink off of the failing system board.
Note: Place the heat sink on its side on aclean, flat surface so the thermal
grease on the bottom of the heat sink does not touch the surface and become
contaminated.
11. To remove the microprocessor from the failing system board, release the lever
1 securing the microprocessor 3 then pivot the microprocessor retainer 2
until it is fully open.
Chapter 2. Replacing hardware 11

12. Lift the microprocessor straight up and out of the socket.
Important
Do not touch the gold contacts on the bottom of the microprocessor.
When handling the microprocessor, touch only the sides.
a. Note the orientation of the notches 1 on the microprocessor. This is
important when installing the microprocessor on the new system board.
b. Do not drop anything on the socket while it is open. Keep all contacts as
clean as possible.
13. On the new system board, release the lever securing the microprocessor
retainer and then pivot the retainer until it is fully open.
14. Position the microprocessor so that the notches on the microprocessor are
aligned with the tabs in the microprocessor socket on the new system board.
Important
To avoid damaging the microprocessor, do not tilt the microprocessor
when installing it into the microprocessor socket.
12 Hardware Replacement Guide