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
FITNESS FOR A PARTICULAR PURPOSE. Some states
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This publication could include technical inaccuracies or
typographical errors. Changes are periodically made to the
information herein; these changes will be incorporated in
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improvements or changes to the products or the programs
described in this publication at any time.
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to, or information about, IBM products (machines and
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© Copyright International Business Machines
Corporation 2002. All rights reserved.
US Government Users Restricted Rights – Use, duplication
or disclosure restricted by GSA ADP Schedule Contract
with IBM Corp.  
						

							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 information.
ImportantThis manual is intended for trained service
personnel who are familiar with ThinkPad products.
Use this manual along with the advanced diagnostic
tests to troubleshoot problems effectively.
Before servicing an IBM ThinkPad product, be sure
to review the safety information under“Safety
notices: multilingual translations”on page 3,“Safety
information”on page 13, and“Laser compliance
statement”on page 18.
© Copyright IBM Corp. 2002iii  
						

							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
Laser compliance statement.........18
General descriptions..........21
Read this first.............21
What to do first...........21
Related service information.........23
Service web site...........23
Restoring the preloaded system......23
Passwords.............26
Power management..........28
Checkout guide............32
Testing the computer..........33
Detecting system information with PC-Doctor . . . 34
Power system checkout.........35
ThinkPad T20, T21, T22 and T23 series.....39
Product overview............41
Specifications............43
Status indicators...........45
FRU Tests.............47
Fn key combinations..........48
Symptom-to-FRU index..........49
Numeric error codes..........49
Error messages...........52
Beep symptoms...........53
No-beep symptoms..........53
LCD-related symptoms.........54
Intermittent problems..........55
Undetermined problems.........55
FRU replacement notices.........56
Screw notices............56
Retaining serial numbers.........57
Removing and replacing a FRU........59
1010 Battery pack...........60
1020 Backup battery..........61
© Copyright IBM Corp. 2002
v  
						

							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 Secure chip..........117
1200 Microphone cable.........118
2010 LCD assembly..........121
2020 Front bezel...........122
2030 Inverter card..........123
2040 LCD panel...........125
2050 Antenna assembly........128
2060 Sub card...........131
3010 ThinkPad Dock PCI cover......133
3020 ThinkPad Dock top cover......136
Locations..............140
Front view............140
Rear view.............141
Bottom view............142
Parts list . .............143
T20, T21, T22 and T23 series model matrix 146
Overall.............147
AC adapters............156
LCD FRUs............157
Keyboard.............160
Recovery CDs...........161
Miscellaneous parts..........170
Optional FRUs...........171
Common parts list..........172
Notices . .............174
Trademarks............174
viThinkPad T20, T21, T22, T23 (MT 2647/2648) 
						

							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 diskette fixes are installed before
replacing any FRUs listed in this manual.
Use the following strategy to prevent unnecessary expense
for replacing and servicing FRUs:
vIf you are instructed to replace a FRU but the
replacement does not correct the problem, reinstall
the original FRU before you continue.
vSome computers have both a processor board and a
system board. If you are instructed to replace either the
processor board or the system board, and replacing one
of them does not correct the problem, reinstall that
board, and then replace the other one.
vIf an adapter or device consists of more than one FRU,
any of the FRUs may be the cause of the error. Before
replacing the adapter or device, remove the FRUs, one
by one, to see if the symptoms change. Replace only
the FRU that changed the symptoms.
Attention:The setup configuration on the computer you
are servicing may have been customized. Running
Automatic Configuration may alter the settings. Note the
current configuration settings (using the View Configuration
option); then, when service has been completed, verify that
those settings remain in effect.
© Copyright IBM Corp. 2002
1   
						

							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
diagnosis with the first error code. Whatever causes the
first error code may also cause false error codes. If no
error code is displayed, see if the error symptom is listed
in the Symptom-to-FRU Index for the computer you are
servicing.
Diskette compatibility matrix
The compatibility of each of the drives with the diskettes
for it is as follows:
Diskette
driveDiskette
capacityCompatibility
3.5-inch 1.0 MB Read and write
2.0 MB Read and write
4.0 MB Not compatible Important service information
2ThinkPad T20, T21, T22, T23 (MT 2647/2648) 
						

							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 computer and
listening for rattling sounds. Metallic parts or metal
flakes can cause electrical shorts.
Avant de remettre l’ordinateur sous tension après
remplacement d’une unitéen clientèle, vérifiez que
tous les ressorts, vis et autres pièces sont bien en
place et bien fixées. Pour ce faire, secouez l’unitéet
assurez-vous qu’aucun bruit suspect ne se produit. Des
pièces métalliques ou des copeaux de métal pourraient
causer un court-circuit.
Bevor nach einem FRU-Austausch der Computer
wieder angeschlossen wird, mußsichergestellt werden,
daßkeine Schrauben, Federn oder andere Kleinteile
fehlen oder im Gehäuse vergessen wurden. Der
Computer mußgeschüttelt und auf Klappergeräusche
geprüft werden. Metallteile oder-splitter können
Kurzschlüsse erzeugen.
Prima di accendere l’elaboratore dopo cheéstata
effettuata la sostituzione di una FRU, accertarsi che
tutte le viti, le molle e tutte le altri parti di piccole
dimensioni siano nella corretta posizione e non siano
sparse all’interno dell’elaboratore. Verificare ciò
scuotendo l’elaboratore e prestando attenzione ad
eventuali rumori; eventuali parti o pezzetti metallici
possono provocare cortocircuiti pericolosi.
Antes de encender el sistema despues de sustituir una
FRU, compruebe que todos los tornillos, muelles y
demás piezas pequeñas se encuentran en su sitio y no
se encuentran sueltas dentro del sistema.
Compruébelo agitando el sistema y escuchando los
posibles ruidos que provocarían. Las piezas metálicas
pueden causar cortocircuitos eléctricos.
Safety notices
Introduction3 
						

							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, ne les exposez ni au feu ni à l’eau.
Ne les mettez pas en court-circuit. Pour les mettre
au rebut, conformez-vous à la réglementation en
vigueur. Lorsque vous remplacez la pile de
sauvegarde ou celle de l’horloge temps réel, veillez
à n’utiliser que les modèles cités dans la liste de
pièces détachées adéquate. Une batterie ou une
pile inappropriée risque de prendre feu ou
d’exploser.
Die Bereitschaftsbatterie, die sich unter dem
Diskettenlaufwerk befindet, kann geringe Mengen
Nickel und Cadmium enthalten. Sie darf nur durch
die Verkaufsstelle oder den IBM Kundendienst
ausgetauscht werden. Sie darf nicht zerlegt,
wiederaufgeladen, kurzgeschlossen, oder Feuer
oder Wasser ausgesetzt werden. Die Batterie kann
schwere Verbrennungen oder Verätzungen
verursachen. Bei der Entsorgung die örtlichen
Bestimmungen für Sondermüll beachten. Beim
Ersetzen der Bereitschafts-oder Systembatterie nur
Batterien des Typs verwenden, der in der
Ersatzteilliste aufgeführt ist. Der Einsatz falscher
Batterien kann zu Entzündung oder Explosion
führen.
(continued)
Safety notices
4ThinkPad T20, T21, T22, T23 (MT 2647/2648)