Lenovo ThinkCentre A55 8705 Parts list manual

Hardware Replacement Guide
Types 6490, 8700, 8701, 8705
Types 8717, 8973, 8975, 8979
Types 8983, 8985, 8991, 8995
Types 9265, 9269, 9277, 9279
Types 9283, 9287, 9379, 9383
Types 9387, 9389, 9631, 9635
Types 9637, 9646, 9648, 9694

Hardware Replacement Guide

Third Edition (February 2007)
©Copyright Lenovo 2006, 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 .......vi
Tools required .............vi
Handling static-sensitive devices .......vi
Chapter 1. Locations .........1
Locating components ...........1
Locating connectors on the front of the computer ..2
Locating connectors on the rear of the computer ..3
Identifying parts on the system board ......4
Chapter 2. Replacing hardware .....7
Removing the computer cover ........7
Removing and replacing the front bezel .....9
Replacing the power supply .........10
Replacing the heat sink assembly .......11
Replacing amemory module ........15
Replacing an adapter ...........16
Replacing the hard disk drive ........17
Replacing an optical drive .........21
Replacing the diskette drive .........22
Replacing the system fan assembly ......23
Replacing the keyboard ..........25
Replacing the mouse ...........25
Completing the installation .........26
Updating (flashing) BIOS from adiskette or
CD-ROM ...............28
Appendix. Notices ..........29
Television output notice ..........30
Trademarks ..............30
©Lenovo 2006, 2007. Portions ©IBM Corp. 2005. iii

iv Hardware Replacement Guide

Overview
This guide is intended for use by customers who are replacing Customer
Replaceable Units (CRUs).
Note: Use only parts provided by Lenovo
™
.
This guide contains procedures for replacing the following parts:
vPower supply
vHeat sink assembly
vMemory modules
vAdapter
vHard disk drive
vOptical drive
vDiskette drive
vSystem fan assembly
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.
©Lenovo 2006, 2007. Portions ©IBM Corp. 2005. v

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
vPublications
vTroubleshooting information
vParts information
vDownloads and drivers
vLinks to other useful sources of information
vSupport phone list
To access this information, go to http://www.lenovo.com/support.
Tools required
To replace some parts in your computer, you will 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.
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 remove the computer cover, see “Removing
the computer cover” on page 7.
Locating components
The following illustration will help you locate the various components in your
computer.
1 Microprocessor fan and heat
sink
4 PCI Express and PCI adapter connectors
2 Memory modules (2) 5 System fan
3 PCI adapter card 6 Power supply
©Lenovo 2006, 2007. Portions ©IBM Corp. 2005. 1

Locating connectors on the front of the computer
The following illustration shows the location of connectors on the front of the
computer.
1 USB connector 3 Microphone connector
2 Headphone connector 4 USB connector
2Hardware Replacement Guide

Locating connectors on the rear of the computer
The following illustration shows the location of connectors on the rear of the
computer.
1 Power supply diagnostic
LEDs
10 Ethernet connector
2 Voltage selection switch
(some models)
11 USB connectors (2)
3 Power connector 12 Microphone connector
4 Standard mouse connector 13 Audio line out connector
5 Standard keyboard connector 14 Audio line in connector
6 Serial connector 15 PCI Express x1 or PCI Express x16 graphics
adapter connector
7 Parallel connector 16 PCI Express x1 or PCI Express x16 graphics
adapter connector
8 VGA monitor connector 17 PCI Adapter connector
9 USB connectors (2)
Chapter 1. Locations 3

Identifying parts on the system board
The system board (sometimes called the planar or motherboard)is the main circuit
board in your computer. It provides basic computer functions and supports a
variety of devices that are factory-installed or that you can install later.
The following illustration shows the locations of parts on the system board (some
models).
1 Microprocessor fan connector 12 Front panel connector
2 Microprocessor and heat sink 13 SATA IDE connectors (2)
3 Memory connector 114 Front panel USB connectors (2)
4 Memory connector 215 SATA IDE connector (2)
5 Clear CMOS/Recovery jumper 16 PCI adapter connectors
6 Power connector 17 Front audio connector
7 Diskette drive connector 18 CD-IN connector
8 IDE connector 119 PCI Express x16 graphics adapter
connector
9 IDE connector 220 PCI Express x1 adapter connector
10 Battery 21 System fan connector
11 Power fan connector 22 12v power connector
4Hardware Replacement Guide

The following illustration shows the locations of parts on the system board (some
models).
1 Microprocessor and heat sink 12 Front USB connectors (2)
2 Microprocessor fan connector 13 Serial (COM) connector
3 Memory connector 114 Front audio connector
4 Memory connector 215 CD-IN connector
5 Power connector 16 PCI adapter connectors (2)
6 Diskette drive connector 17 PCI Express x1 adapter connector
7 IDE connector 18 Battery
8 SATA IDE connectors (2) 19 PCI Express x16 graphics adapter
connector
9 Power fan connector 20 System fan connector
10 Front panel connector 21 12v power connector
11 Clear CMOS/Recovery jumper
Chapter 1. Locations 5

The following illustration shows the locations of parts on the system board (some
models).
1 Microprocessor and heat sink 12 Front panel connector
2 Microprocessor fan connector 13 Front panel USB connectors (2)
3 Memory connector 114 Front audio connector
4 Memory connector 215 CD-IN connector
5 Diskette drive connector 16 PCI adapter connectors
6 Power connector 17 PCI Express x1 adapter connector
7 IDE connector 118 Battery
8 IDE connector 219 PCI Express x16 graphics adapter
connector
9 Power fan connector 20 System fan connector
10 SATA IDE connector (2) 21 12v power connector
11 Clear CMOS/Recovery jumper
6Hardware Replacement Guide

Chapter 2. Replacing hardware
Attention:
Do not remove the computer cover or attempt any repair before reading the “Important
safety information” in the Safety and Warranty Guide that was included with your computer.
To obtain copies 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.
Removing the computer cover
Important
Turn off the computer and wait 3to 5minutes to let the computer cool
before removing the computer cover.
To remove the computer cover:
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 all 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 connectors on the front of the computer” on page 2
and “Locating connectors on the rear of the computer” on page 3.
4. Remove any locking devices that secure the computer cover.
5. If there are thumbscrews securing the cover, remove them.
©Lenovo 2006, 2007. Portions ©IBM Corp. 2005. 7

6. Press the cover-release button on the side of the cover and slide the computer
cover to the rear to and remove.
8Hardware Replacement Guide

Removing and replacing the front bezel
To remove and replace the front bezel:
1. Remove the computer cover. See “Removing the computer cover” on page 7.
2. Remove the front bezel by releasing the three plastic tabs on the left side and
pivoting the bezel outward. Carefully set the bezel to the side without
disconnecting the power switch and LED assembly cable.
3. To reinstall the bezel, align the plastic tabs on the right side of the bezel with
the corresponding holes in the chassis, then pivot it inward until it snaps into
position on the left side.
4. Go to “Completing the installation” on page 26.
Chapter 2. Replacing hardware 9

Replacing the power supply
Attention:
Do not remove the computer cover or attempt any repair before reading the “Important
safety information” in the Safety and Warranty Guide that was included with your computer.
To obtain copies of the Safety and Warranty Guide,go to the Support Web site at
http://www.lenovo.com/support.
To replace the power supply:
1. Remove the computer cover. See “Removing the computer cover” on page 7.
Note: For this procedure, it helps to lay the computer on its side.
2. Disconnect the power supply cables from the system board and from all drives.
See “Identifying parts on the system board” on page 4.
3. Remove the four screws that secure the power supply at the rear of the chassis.
4. Lift the power supply out of the chassis.
5. Install the new power supply into the chassis so that the screw holes in the
power supply align with those in the chassis.
6. Install the four screws to secure the power supply.
Note: Use only the screws provided by Lenovo.
7. Reconnect the power supply connectors to the system board.
8. Reconnect apower supply connector to each of the drives.
9. Go to “Completing the installation” on page 26.
10 Hardware Replacement Guide

Replacing the heat sink assembly
Attention:
Do not remove the computer cover or attempt any repair before reading the “Important
safety information” in the Safety and Warranty Guide that was included with your computer.
To obtain copies of the Safety and Warranty Guide,go to the Support Web site at
http://www.lenovo.com/support.
To replace the heat sink assembly:
1. Remove the computer cover. See “Removing the computer cover” on page 7.
2. Lay the computer on its side.
3. Locate the heat sink. See “Identifying parts on the system board” on page 4.
4. Disconnect the heat sink and the fan assembly cable from the system board.
5. Depending on which heat sink you are removing, do one of the following:
Chapter 2. Replacing hardware 11

a. Pivot the handle 1 to release the heat sink clamp and then disengage the
clamp from the plastic retention bracket.
b. Remove the four screws 1 securing the heat sink and fan assembly to the
system board.
Note: You might have to gently twist the heat sink to free it from the
microprocessor.
6. Lift the failing heat sink and fan assembly off the system board.
12 Hardware Replacement Guide