IBM Thinkpad T20 T21 T22 T23 Manual

IBM Mobile Systems
ThinkPad Computer
Hardware Maintenance Manual
April 2002
This manual supports:
ThinkPad T20, T21, T22, T23
(MT 2647/2648)
ThinkPad Dock (MT 2631)

           

NoteBefore using this information and the product it
supports, be sure to read the general information
under “Notices” on page 174.
First Edition (April 2002)
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...

About this manual
This manual contains service and reference information for
IBM ThinkPad T20, T21, T22, T23 (MT2647, 2648), and
ThinkPad Dock (MT2631) products. Use this manual along
with the advanced diagnostic tests to troubleshoot
problems.
The manual is divided into sections as follows:
vThe common sections provide general information,
guidelines, and safety information required in servicing
computers.
vThe product-specific section includes service, reference,
and product-specific parts...

ivThinkPad T20, T21, T22, T23 (MT 2647/2648) 

Contents
About this manual...........iii
Introduction.............1
Important service information.........1
Strategy for replacing FRUs........1
How to use error messages........2
Diskette compatibility matrix.........2
Safety notices: multilingual translations......3
Safety information............13
General safety............13
Electrical safety...........14
Safety inspection guide.........15
Handling devices that are sensitive to electorostatic
discharge............16
Grounding requirements.........17...

1030 Hard-disk drive..........63
1040 DIMM............65
1050 Mini PCI adapter.........66
1060 Ethernet daughter card.......71
1070 Ultrabay 2000 device........73
1080 Keyboard...........74
1090 Keyboard CRU insulator.......82
1100 Hinge cover...........83
1110 Keyboard bezel..........88
1120 Fan assembly..........94
1130CPU.............98
1140 PC Card slot assembly.......100
1150 Speaker...........103
1160 Hard-disk bay..........105
1170 Ultrabay 2000 slot........107
1180 System board..........113
1190...

Introduction
Important service information
ImportantBIOS and device driver fixes are
customer-installable. The BIOS and device drivers
are posted on the IBM support site
http://www.ibm.com/pc/support
Advise customers to contact the PC Company
HelpCenter at 800-772-2227 if they need assistance
in obtaining or installing any diskette fixes.
Customers in Canada should call IBM HelpPC at
800-565-3344 for assistance or download
information.
Strategy for replacing FRUs
Before replacing partsMake sure that all...

Strategy for replacing a hard-disk driveAlways try to run a low-level format before replacing a
hard-disk drive.
Attention:The drive startup sequence in the computer
you are servicing may have been changed. Be extremely
careful during write operations such as copying, saving, or
formatting. If you select an incorrect drive, data or
programs can be overwritten.
How to use error messages
Use the error codes displayed on the screen to diagnose
failures. If more than one error code is displayed, begin the...

Safety notices: multilingual translations
In this manual, safety notices appear in English with a
page number reference to the appropriate multilingual,
translated safety notice found in this section.
The following safety notices are provided in English,
French, German, Italian, and Spanish.
Safety notice 1
Before the computer is powered-on after FRU
replacement, make sure all screws, springs, and other
small parts are in place and are not left loose inside
the computer. Verify this by shaking the...

Safety notice 2
DANGER
Some standby batteries contain a small amount of
nickel and cadmium. Do not disassemble a standby
battery, recharge it, throw it into fire or water, or
short-circuit it. Dispose of the battery as required
by local ordinances or regulations. Use only the
battery in the appropriate parts listing. Use of an
incorrect battery can result in ignition or explosion
of the battery.
Certaines batteries de secours contiennent du
nickel et du cadmium. Ne les démontez pas, ne les
rechargez pas,...