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IBM Mobile Systems
ThinkPad Computer
Hardware Maintenance Manual
October 2001
This manual supports:
ThinkPad A20m, A21m, A22m
(MT 2628/2633)
A20p, A21p, A22p
(MT 2629)
ThinkPad Dock (MT 2631)
Note
Before using this information and the product it
supports, be sure to read the general information
under “Notices” on page 150.
Second Edition (October 2001)
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
do not allow disclaimer or express or implied warranties in
certain transactions; therefore, this statement may not
apply to you.
This publication could include technical inaccuracies or
typographical errors. Changes are periodically made to the
information herein; these changes will be incorporated in
new editions of the publication. IBM may make
improvements or changes to the products or the programs
described in this publication at any time.
It is possible that this publication may contain references
to, or information about, IBM products (machines and
programs), programming, or services that are not
announced in your country. Such references or information
must not be construed to mean that IBM intends to
announce such IBM products, programming, or services in
your country.
Requests for technical information about IBM products
should be made to your IBM authorized dealer or your IBM
marketing representative.
© Copyright International Business Machines
Corporation 2001. 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 A20, A21, A22 (MT2628, 2629, 2633), 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.
Important
This 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 14, and Laser compliance” “
statement on page 18.”
© Copyright IBM Corp. 2001 iii
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. . . . . . . . . . . . 14
General safety . . . . . . . . . . . . 14
Electrical safety . . . . . . . . . . . 15
Safety inspection guide . . . . . . . . . 16
Handling electrostatic discharge-sensitive devices 17
Grounding requirements . . . . . . . . . 18
Laser compliance statement. . . . . . . . . 18
General descriptions . . . . . . . . . . 23
Read this first . . . . . . . . . . . . . 23
What to do first . . . . . . . . . . . 23
Related service information . . . . . . . . . 25
Service web site . . . . . . . . . . . 25
Product recovery program . . . . . . . . 25
Passwords . . . . . . . . . . . . . 27
Power management . . . . . . . . . . 30
Checkout guide . . . . . . . . . . . . 33
Testing the computer . . . . . . . . . . 33
Detecting system information with PC-Doctor. . . 35
Power system checkout . . . . . . . . . 35
ThinkPad A20m/p, A21m/p and A22m/p. . . . . 39
Product overview . . . . . . . . . . . . 41
Specifications . . . . . . . . . . . . 41
Status indicators . . . . . . . . . . . 44
FRU tests . . . . . . . . . . . . . 46
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 DIMM . . . . . . . . . . . . 61
1030 Mini PCI adapter . . . . . . . . . 63
© Copyright IBM Corp. 2001 v
1040 Backup battery . . . . . . . . . . 66
1050 Hard-disk drive or RF ID adapter . . . . 67
1060 Ultrabay 2000 device . . . . . . . . 69
1070 Keyboard . . . . . . . . . . . 71
1080 Keyboard CRU insulator . . . . . . . 74
1090 Hinge cover and clear sheet icon . . . . 75
1100 Keyboard bezel and speaker . . . . . . 76
1110 Microphone and speaker cable . . . . . 78
1120 Sub card . . . . . . . . . . . . 80
1130 PC Card slot assembly . . . . . . . 82
1140 Fan assembly . . . . . . . . . . 83
1150 Diskette drive . . . . . . . . . . 85
1160 Upper shield. . . . . . . . . . . 87
1170 TV card . . . . . . . . . . . . 88
1180 CPU socket and CPU . . . . . . . . 89
1190 System board and RJ45/11 connector
assembly . . . . . . . . . . . . 91
Thermal rubbers location. . . . . . . . . 93
2010 LCD assembly . . . . . . . . . . 94
2020 Front bezel . . . . . . . . . . . 96
2030 Inverter card . . . . . . . . . . 99
2040 LCD panel . . . . . . . . . . . 101
3010 ThinkPad Dock PCI cover . . . . . . 105
3020 ThinkPad Dock top cover . . . . . . 107
Locations . . . . . . . . . . . . . . 112
Front view. . . . . . . . . . . . . 112
Rear view . . . . . . . . . . . . . 113
Bottom view . . . . . . . . . . . . 114
Parts list . . . . . . . . . . . . . . 115
A series model matrix . . . . . . . . . 115
Overall . . . . . . . . . . . . . 123
AC adapter . . . . . . . . . . . . 136
LCD FRUs . . . . . . . . . . . . 136
Keyboard . . . . . . . . . . . . . 140
Recovery CDs . . . . . . . . . . . 141
Miscellaneous parts . . . . . . . . . . 145
Optional FRUs . . . . . . . . . . . 147
Common parts list . . . . . . . . . . 148
Notices . . . . . . . . . . . . . . 150
Trademarks . . . . . . . . . . . . 150
vi ThinkPad A20m/p, A21m/p, A22m/p
Introduction
Important service information
Important
BIOS 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 parts
Make sure that all diskette fixes are installed before
replacing any FRUs listed in this manual.
Use the following strategy to prevent unnecessary FRU
replacement and service expense:
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. 2001 1
Strategy for replacing a hard-disk drive
Always 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
drive
Diskette
capacity
Compatibility
3.5-inch 1.0 MB Read and write
2.0 MB Read and write
4.0 MB Not compatible
Important service information
2ThinkPad A20m/p, A21m/p, A22m/p
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 A20m/p, A21m/p, A22m/p
(continuation of safety notice 2)
Alcune batterie di riserva contengono una piccola
quantit di nichel e cadmio. Non smontarle,à
ricaricarle, gettarle nel fuoco o nell acqua n’ é
cortocircuitarle. Smaltirle secondo la normativa in
vigore (DPR 915/82, successive disposizioni e
disposizioni locali). Quando si sostituisce la
batteria dell RTC (real time clock) o la batteria di’
supporto, utilizzare soltanto i tipi inseriti
nell appropriato Catalogo parti. L impiego di una’ ’
batteria non adatta potrebbe determinare l incendio’
o l’esplosione della batteria stessa.
Algunas bater as de reserva contienen unaí
peque a cantidad de n quel y cadmio. No lasñ í
desmonte, ni recargue, ni las eche al fuego o al
agua ni las cortocircuite. Des chelas tal comoé
dispone la normativa local. Utilice s lo bater as queó í
se encuentren en la lista de piezas. La utilizaci nó
de una bater a no apropiada puede provocar laí
ignici n o explosi n de la misma.ó ó
Safety notices
Introduction 5
Safety notice 3
DANGER
The battery pack contains small amounts of nickel.
Do not disassemble it, throw it into fire or water, or
short-circuit it. Dispose of the battery pack as
required by local ordinances or regulations. Use
only the battery in the appropriate parts listing
when replacing the battery pack. Use of an
incorrect battery can result in ignition or explosion
of the battery.
La batterie contient du nickel. Ne la d montez pas,é
ne l exposez ni au feu ni l eau. Ne la mettez pas’ à ’
en court- circuit. Pour la mettre au rebut,
conformez-vous la r glementation en vigueur.à é
Lorsque vous remplacez la batterie, veillez à
n utiliser que les mod les cit s dans la liste de’ è é
pi ces d tach es ad quate. En effet, une batterieè é é é
inappropri e risque de prendre feu ou d exploser.é ’
Akkus enthalten geringe Mengen von Nickel. Sie
d rfen nicht zerlegt, wiederaufgeladen,ü
kurzgeschlossen, oder Feuer oder Wasser
ausgesetzt werden. Bei der Entsorgung die
ö ü ürtlichen Bestimmungen f r Sonderm ll beachten.
Beim Ersetzen der Batterie nur Batterien des Typs
verwenden, der in der Ersatzteilliste aufgef hrt ist.ü
Der Einsatz falscher Batterien kann zu Entz ndungü
oder Explosion f hren.ü
La batteria contiene piccole quantit di nichel. Nonà
smontarla, gettarla nel fuoco o nell acqua n’ é
cortocircuitarla. Smaltirla secondo la normativa in
vigore (DPR 915/82, successive disposizioni e
disposizioni locali). Quando si sostituisce la
batteria, utilizzare soltanto i tipi inseriti
nell appropriato Catalogo parti. L impiego di una’ ’
batteria non adatta potrebbe determinare l incendio’
o l’esplosione della batteria stessa.
(continued)
Safety notices
6ThinkPad A20m/p, A21m/p, A22m/p
(continuation of safety notice 3)
Las bater as contienen peque as cantidades deí ñ
n quel. No las desmonte, ni recargue, ni las eche alí
fuego o al agua ni las cortocircuite. Des chelas talé
como dispone la normativa local. Utilice s loó
bater as que se encuentren en la lista de piezas alí
sustituir la bater a. La utilizaci n de una baterí ó ía no
apropiada puede provocar la ignici n o explosi nó ó
de la misma.
Safety notices
Introduction 7
Safety notice 4
DANGER
The lithium battery can cause a fire, an explosion,
or a severe burn. Do not recharge it, remove its
polarized connector, disassemble it, heat it above
100 C (212 F), incinerate it, or expose its cell° °
contents to water. 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.
La pile de sauvegarde contient du lithium. Elle
pr sente des risques d incendie, d explosion ou deé ’ ’
br lures graves. Ne la rechargez pas, ne retirez pasû
son connecteur polaris et ne la d montez pas. Neé é
l exposez pas une temperature sup rieure’ à é à
100 C, ne la faites pas br ler et n en exposez pas° û ’
le contenu l eau. Mettez la pile au rebutà ’
conform ment la r glementation en vigueur. Uneé à é
pile inappropri e risque de prendre feu oué
d exploser.’
Die Systembatterie ist eine Lithiumbatterie. Sie
kann sich entz nden, explodieren oder schwereü
Verbrennungen hervorrufen. Batterien dieses Typs
d rfen nicht aufgeladen, zerlegt, ber 100 C erhitztü ü
oder verbrannt werden. Auch darf ihr Inhalt nicht
mit Wasser in Verbindung gebracht oder der zur
richtigen Polung angebrachte Verbindungsstecker
entfernt werden. Bei der Entsorgung die rtlichenö
Bestimmungen f r Sonderm ll beachten. Beimü ü
Ersetzen der Batterie nur Batterien des Typs
verwenden, der in der Ersatzteilliste aufgef hrt ist.ü
Der Einsatz falscher Batterien kann zu Entz ndungü
oder Explosion f hren.ü
(continued)
Safety notices
8ThinkPad A20m/p, A21m/p, A22m/p
(continuation of safety notice 4)
La batteria di supporto e una batteria al litio e puo
incendiarsi, esplodere o procurare gravi ustioni.
Evitare di ricaricarla, smontarne il connettore
polarizzato, smontarla, riscaldarla ad una
temperatura superiore ai 100 gradi centigradi,
incendiarla o gettarla in acqua. Smaltirla secondo
la normativa in vigore (DPR 915/82, successive
disposizioni e disposizioni locali). L impiego di una’
batteria non adatta potrebbe determinare l incendio’
o l’esplosione della batteria stessa.
La bater a de repuesto es una bater a de litio yí í
puede provocar incendios, explosiones o
quemaduras graves. No la recargue, ni quite el
conector polarizado, ni la desmonte, ni caliente por
encima de los 100 C (212 F), ni la incinere ni° °
exponga el contenido de sus celdas al agua.
Des chela tal como dispone la normativa local.é
Safety notices
Introduction 9
Safety notice 5
If the LCD breaks and the fluid from inside the LCD
gets into your eyes or on your hands, immediately
wash the affected areas with water for at least 15
minutes. Seek medical care if any symptoms from the
fluid are present after washing.
Si le panneau d affichage cristaux liquides se brise et’ à
que vous recevez dans les yeux ou sur les mains une
partie du fluide, rincez-les abondamment pendant au
moins quinze minutes. Consultez un m decin si desé
sympt mes persistent apr s le lavage.ô è
Die Leuchtstoffr hre im LCD-Bildschirm enth ltö ä
Quecksilber. Bei der Entsorgung die rtlichenö
Bestimmungen f r Sonderm ll beachten. Derü ü
LCD-Bildschirm besteht aus Glas und kann zerbrechen,
wenn er unsachgem behandelt wird oder deräß
Computer auf den Boden f llt. Wenn der Bildschirmä
besch digt ist und die darin befindliche Fl ssigkeit inä ü
Kontakt mit Haut und Augen ger t, sollten dieä
betroffenen Stellen mindestens 15 Minuten mit Wasser
abgesp lt und bei Beschwerden anschlie end ein Arztü ß
aufgesucht werden.
Nel caso che caso l LCD si dovesse rompere ed il’
liquido in esso contenuto entrasse in contatto con gli
occhi o le mani, lavare immediatamente le parti
interessate con acqua corrente per almeno 15 minuti;
poi consultare un medico se i sintomi dovessero
permanere.
Si la LCD se rompe y el fluido de su interior entra en
contacto con sus ojos o sus manos, lave
inmediatamente las reas afectadas con agua duranteá
15 minutos como m nimo. Obtenga atenci n medica sií ó
se presenta algún síntoma del fluido despues de
lavarse.
Safety notices
10 ThinkPad A20m/p, A21m/p, A22m/p
Safety notice 6
DANGER
To avoid shock, do not remove the plastic cover
that protects the lower part of the inverter card.
Afin d viter tout risque de choc lectrique, ne’é é
retirez pas le cache en plastique prot geant laé
partie inf rieure de la carte d alimentation.é ’
Aus Sicherheitsgr nden die Kunststoffabdeckung,ü
die den unteren Teil der Spannungswandlerplatine
umgibt, nicht entfernen.
Per evitare scosse elettriche, non rimuovere la
copertura in plastica che avvolge la parte inferiore
della scheda invertitore.
Para evitar descargas, no quite la cubierta de
pl stico que rodea la parte baja de la tarjetaá
invertida.
Safety notices
Introduction 11
Safety notice 7
DANGER
Though the main batteries have low voltage, a
shorted or grounded battery can produce enough
current to burn personnel or combustible materials.
Bien que le voltage des batteries principales soit
peu lev , le court-circuit ou la mise la masseé é à
d une batterie peut produire suffisamment de’
courant pour br ler des mat riaux combustibles ouû é
causer des br lures corporelles graves.û
Obwohl Hauptbatterien eine niedrige Spannung
haben, k nnen sie doch bei Kurzschlu oderö ß
Erdung genug Strom abgeben, um brennbare
Materialien zu entz nden oder Verletzungen beiü
Personen hervorzurufen.
Sebbene le batterie di alimentazione siano a basso
voltaggio, una batteria in corto circuito o a massa
pu fornire corrente sufficiente da bruciareò
materiali combustibili o provocare ustioni ai tecnici
di manutenzione.
Aunque las bater as principales tienen un voltajeí
bajo, una bater a cortocircuitada o con contacto aí
tierra puede producir la corriente suficiente como
para quemar material combustible o provocar
quemaduras en el personal.
Safety notices
12 ThinkPad A20m/p, A21m/p, A22m/p
Safety notice 8
DANGER
Before removing any FRU, power off the computer,
unplug all power cords from electrical outlets,
remove the battery pack, and then disconnect any
interconnecting cables.
Avant de retirer une unit rempla able en client le,é ç è
mettez le syst me hors tension, d branchez tousè é
les cordons d alimentation des socles de prise de’
courant, retirez la batterie et d connectez tous lesé
cordons d interface.’
Die Stromzufuhr mu abgeschaltet, alle Stromkabelß
aus der Steckdose gezogen, der Akku entfernt und
alle Verbindungskabel abgenommen sein, bevor
eine FRU entfernt wird.
Prima di rimuovere qualsiasi FRU, spegnere il
sistema, scollegare dalle prese elettriche tutti i cavi
di alimentazione, rimuovere la batteria e poi
scollegare i cavi di interconnessione.
Antes de quitar una FRU, apague el sistema,
desenchufe todos los cables de las tomas de
corriente el ctrica, quite la bateré ía y, a
continuaci n, desconecte cualquier cable deó
conexi n entre dispositivos.ó
Safety notices
Introduction 13
Safety information
The following section contains the safety information that
you need to be familiar with before servicing an IBM
mobile computer.
General safety
Follow these rules to ensure general safety:
v Observe good housekeeping in the area of the
machines during and after maintenance.
v When lifting any heavy object:
1. Ensure you can stand safely without slipping.
2. Distribute the weight of the object equally between
your feet.
3. Use a slow lifting force. Never move suddenly or
twist when you attempt to lift.
4. Lift by standing or by pushing up with your leg
muscles; this action removes the strain from the
muscles in your back. Do not attempt to lift any
objects that weigh more than 16 kg (35 lb) or objects
that you think are too heavy for you.
v Do not perform any action that causes hazards to the
customer, or that makes the equipment unsafe.
v Before you start the machine, ensure that other service
representatives and the customer s personnel are not in’
a hazardous position.
v Place removed covers and other parts in a safe place,
away from all personnel, while you are servicing the
machine.
v Keep your toolcase away from walk areas so that other
people will not trip over it.
v Do not wear loose clothing that can be trapped in the
moving parts of a machine. Make sure that your sleeves
are fastened or rolled up above your elbows. If your hair
is long, fasten it.
v Insert the ends of your necktie or scarf inside clothing or
fasten it with a nonconductive clip, approximately 8
centimeters (3 inches) from the end.
v Do not wear jewelry, chains, metal-frame eyeglasses, or
metal fasteners for your clothing.
Attention: Metal objects are good electrical
conductors.
v Wear safety glasses when you are hammering, drilling,
soldering, cutting wire, attaching springs, using solvents,
or working in any other conditions that might be
hazardous to your eyes.
v After service, reinstall all safety shields, guards, labels,
and ground wires. Replace any safety device that is
worn or defective.
v Reinstall all covers correctly before returning the
machine to the customer.
Safety information
14 ThinkPad A20m/p, A21m/p, A22m/p
Observe the special safety precautions when you work
with very high voltages; these instructions are in the
safety sections of maintenance information. Use
extreme care when measuring high voltages.
v Regularly inspect and maintain your electrical hand tools
for safe operational condition.
v Do not use worn or broken tools and testers.
v Never assume that power has been disconnected from
a circuit. First, that it has been powered off.check
v Always look carefully for possible hazards in your work
area. Examples of these hazards are moist floors,
nongrounded power extension cables, power surges,
and missing safety grounds.
v Do not touch live electrical circuits with the reflective
surface of a plastic dental mirror. The surface is
conductive; such touching can cause personal injury and
machine damage.
v Do not service the following parts with the power on
when they are removed from their normal operating
places in a machine:
– Power supply units
– Pumps
– Blowers and fans
– Motor generators
and similar units. (This practice ensures correct
grounding of the units.)
v If an electrical accident occurs:
– Use caution; do not become a victim yourself.
– Switch off power.
– Send another person to get medical aid.
Safety inspection guide
The purpose of this inspection guide is to assist you in
identifying potentially unsafe conditions. As each machine
was designed and built, required safety items were
installed to protect users and service personnel from injury.
This guide addresses only those items. You should use
good judgment to identify potential safety hazards due to
attachment of non-IBM features or options not covered by
this inspection guide.
If any unsafe conditions are present, you must determine
how serious the apparent hazard could be and whether
you can continue without first correcting the problem.
Consider these conditions and the safety hazards they
present:
v Electrical hazards, especially primary power (primary
voltage on the frame can cause serious or fatal
electrical shock)
v Explosive hazards, such as a damaged CRT face or a
bulging capacitor
Safety information
16 ThinkPad A20m/p, A21m/p, A22m/p
v Mechanical hazards, such as loose or missing hardware
To determine whether there are any potentially unsafe
conditions, use the following checklist at the beginning of
every service task. Begin the checks with the power off,
and the power cord disconnected.
Checklist:
1. Check exterior covers for damage (loose, broken, or
sharp edges.)
2. Power-off the computer. Disconnect the power cord.
3. Check the power cord for:
a. A third-wire ground connector in good condition.
Use a meter to measure third-wire ground
continuity for 0.1 ohm or less between the external
ground pin and frame ground.
b. The power cord should be the type specified in the
parts list.
c. Insulation must not be frayed or worn.
4. Remove the cover.
5. Check for any obvious non-IBM alterations. Use good
judgment as to the safety of any non-IBM alterations.
6. Check inside the unit for any obvious unsafe
conditions, such as metal filings, contamination, water
or other liquids, or signs of fire or smoke damage.
7. Check for worn, frayed, or pinched cables.
8. Check that the power-supply cover fasteners (screws
or rivets) have not been removed or tampered with.
Handling electrostatic
discharge-sensitive devices
Any computer part containing transistors or integrated
circuits (ICs) should be considered sensitive to electrostatic
discharge (ESD.) ESD damage can occur when there is a
difference in charge between objects. Protect against ESD
damage by equalizing the charge so that the machine, the
part, the work mat, and the person handling the part are all
at the same charge.
Notes
1. Use product-specific ESD procedures when they
exceed the requirements noted here.
2. Make sure that the ESD protective devices you
use have been certified (ISO 9000) as fully
effective.
When handling ESD-sensitive parts:
v Keep the parts in protective packages until they are
inserted into the product.
v Avoid contact with other people.
Safety information
Introduction 17
v Wear a grounded wrist strap against your skin to
eliminate static on your body.
v Prevent the part from touching your clothing. Most
clothing is insulative and retains a charge even when
you are wearing a wrist strap.
v Use the black side of a grounded work mat to provide a
static-free work surface. The mat is especially useful
when handling ESD-sensitive devices.
v Select a grounding system, such as those listed below,
to provide protection that meets the specific service
requirement.
Note
The use of a grounding system is desirable but
not required to protect against ESD damage.
– Attach the ESD ground clip to any frame ground,
ground braid, or green-wire ground.
– Use an ESD common ground or reference point
when working on a double-insulated or
battery-operated system. You can use coax or
connector-outside shells on these systems.
– Use the round ground-prong of the AC plug on
AC-operated computers.
Grounding requirements
Electrical grounding of the computer is required for
operator safety and correct system function. Proper
grounding of the electrical outlet can be verified by a
certified electrician.
Laser compliance statement
Some IBM Personal Computer models are equipped from
the factory with an optical storage device; such as a
CD-ROM drive or DVD-ROM drive. They are also sold
separately as options. The drive is certified in the U.S. to
conform to the requirements of the Department of Health
and Human Services 21 Code of Federal Regulations
(DHHS 21 CFR) Subchapter J for Class 1 laser products.
Elsewhere, the drive is certified to conform to the
requirements of the International Electrotechnical
Commission (IEC) 825 and CENELEC EN 60 825 for
Class 1 laser products.
Safety information
18 ThinkPad A20m/p, A21m/p, A22m/p
When a CD-ROM drive, DVD drive or the other laser
product is installed, note the following:
CAUTION:
Use of controls or adjustments or performance of
procedures other than those specified herein might
result in hazardous radiation exposure.
O uso de controles, ajustes ou desempenho de
procedimentos diferentes daqueles aqui especificados
pode resultar em perigosa exposi o radia o.çã à çã
Pour viter tout risque d exposition au rayon laser,é ’
respectez les consignes de r glage et d utilisation desé ’
commandes, ainsi que les proc dures d crites.é é
Werden Steuer- und Einstellelemente anders als hier
festgesetzt verwendet, kann gef hrliche Laserstrahlungä
auftreten.
L utilizzo di controlli, regolazioni o l esecuzione di’ ’
procedure diverse da quelle specificate possono
provocare l esposizione a.’
El uso de controles o ajustes o la ejecución de
procedimientos distintos de los aqu especificadosí
puede provocar la exposici n a radiaciones peligrosas.ó
Laser compliance statement
Introduction 19
Opening the CD-ROM drive, DVD-ROM drive or the other
optical storage device could result in exposure to
hazardous laser radiation. There are no serviceable parts
inside those drives. Do not open.
Some CD-ROM drives, DVD-ROM drives or the other
optical storage devices contain an embedded Class 3A or
Class 3B laser diode. Note the following:
Laser compliance statement
20 ThinkPad A20m/p, A21m/p, A22m/p
DANGER
Emits visible and invisible laser radiation when
open. Do not stare into the beam, do not view
directly with optical instruments, and avoid direct
exposure to the beam.
Radia o por raio laser ao abrir. N o olhe fixo noçã ã
feixe de luz, n o olhe diretamente por meio deã
instrumentos ticos e evite exposi o direta com oó çã
feixe de luz.
Rayonnement laser si carter ouvert. vitez de fixerÉ
le faisceau, de le regarder directement avec des
instruments optiques, ou de vous exposer au
rayon.
Laserstrahlung bei ge ffnetem Ger t. Nicht direktö ä
oder ber optische Instrumente in den Laserstrahlü
sehen und den Strahlungsbereich meiden.
Kinyit skor l zersugá é ár ! Ne nézzen bele se szabad
szemmel, se optikai eszk z kkel. Ker lje aö ö ü
sug rnyal bbal valá á ó érintkez st !é
Aprendo l unit vengono emesse radiazioni laser.’ à
Non fissare il fascio, non guardarlo direttamente
con strumenti ottici e evitare l esposizione diretta al’
fascio.
Radiación láser al abrir. No mire fijamente ni
examine con instrumental ptico el haz de luz.ó
Evite la exposici n directa al haz.ó
Laser compliance statement
Introduction 21
General descriptions
This chapter includes descriptions for any ThinkPad model
that has the PC-Doctor DOS diagnostics program. Some
descriptions might not apply to your particular computer.
Read this first
Before you go to the checkout guide, be sure to read this
section.
Important notes
v Only certified trained personnel should
service the computer.
v Read the entire FRU removal and replacement
page before replacing any FRU.
v Use new nylon-coated screws when you
replace FRUs.
v Be extremely careful during such write
operations as copying, saving, or formatting.
Drives in the computer that you are servicing
sequence might have been altered. If you select
an incorrect drive, data or programs might be
overwritten.
v Replace FRUs only for the correct model.
When you replace a FRU, make sure the model
of the machine and the FRU part number are
correct by referring to the FRU parts list.
v A FRU should not be replaced because of a
single, unreproducible failure. Single failures
can occur for a variety of reasons that have
nothing to do with a hardware defect, such as
cosmic radiation, electrostatic discharge, or
software errors. Consider replacing a FRU only
when a problem recurs. If you suspect that a
FRU is defective, clear the error log and run the
test again. If the error does not recur, do not
replace the FRU.
v Be careful not to replace a nondefective FRU.
What to do first
When you do return a FRU, you must include the following
information in the parts exchange form or parts return form
that you attach to it:
__ 1. Name and phone number of servicer
__ 2. Date of service
__ 3. Date on which the machine failed
__ 4. Date of purchase
__ 5. Failure symptoms, error codes appearing on the
display, and beep symptoms
© Copyright IBM Corp. 2001 23
__ 6. Procedure index and page number in which the
failing FRU was detected
__ 7. Failing FRU name and part number
__ 8. Machine type, model number, and serial number
__ 9. Customer s name and address’
Note for warranty:
During the warranty period, the customer may be
responsible for repair costs if the computer damage was
caused by misuse, accident, modification, unsuitable
physical or operating environment, or improper
maintenance by the customer. The following list provides
some common items that are not covered under warranty
and some symptoms that might indicate that the system
was subjected to stress beyond normal use.
Before checking problems with the computer, determine
whether the damage is covered under the warranty by
referring to the following:
The following are not covered under warranty:
v LCD panel cracked from the application of excessive
force or from being dropped
v Scratched (cosmetic) parts
v Distortion, deformation or discoloration of the cosmetic
parts
v Cracked or broken plastic parts, broken latches, broken
pins, or broken connectors caused by excessive force
v Damage caused by liquid spilled into the system
v Damage caused by the improper insertion of a PC Card
or the installation of an incompatible card
v Damage caused by foreign material in the diskette drive
v Diskette drive damage caused by pressure on the
diskette drive cover or by the insertion of a diskette with
multiple labels
v Damaged or bent diskette eject button
v Fuses blown by attachment of a nonsupported device
v Forgotten computer password (making the computer
unusable)
v Sticky keys caused by spilling a liquid onto the keyboard
The following symptoms might indicate damage
caused by nonwarranted activities:
v Missing parts might be a symptom of unauthorized
service or modification.
v If the spindle of a hard-disk drive becomes noisy, it may
have been subjected to excessive force, or dropped.
Read this first
24 ThinkPad A20m/p, A21m/p, A22m/p
Related service information
This section provides information about the following:
v “ ”Service web site
v “ ”Product recovery program
v “ ” Passwords on page 27
v “ ” Power management on page 30
Service web site
When the latest maintenance diskette and the system
program service diskette become available, a notice will be
posted on http://www.ibm.com/pc/partner/infotips
Product recovery program
Restoring the pre-installed software:
If the data on a hard-disk drive is damaged or accidentally
erased, you can restore the software that was shipped with
the computer. This software includes the pre-installed
operating system, applications, and device drivers.
To restore the pre-installed software, you can use either
the Product Recovery program or a Recovery CD.
The Product Recovery program is in the Service Partition,
a section of the hard-disk drive that is not displayed by
Windows Explorer. Use the Recovery CD if it was provided
with the computer.
Note: The recovery process might take up to 2 hours.
To use the Product Recovery program to restore the
pre-installed software, do the following:
1. Save all files and shut down the desktop.
2. Turn off the computer.
3. Turn on the computer. A message appears on the
screen: “To start the Product Recovery program,
press F11”; or, for Windows XP models, “Press F11 to
invoke the IBM Product Recovery program”. Press
F11 quickly; this message is displayed for only a few
seconds.
Note: If this message does not appear, you can use a
Recovery Repair diskette to get access to the
Product Recovery program. (Directions for
making a Recovery Repair diskette are given in
“To create a recovery repair diskette on”
page 26.)
4. From the list displayed on the screen, select the
operating system you want to recover.
5. Select the recovery options you want, and follow the
instructions on the screen.
Related service information
General descriptions 25
Creating the service partition:
To create the Service Partition and install the preloaded
system from the Recovery CD, do the following:
To create the Service Partition (SP):
1. Erase all partitions on the hard-disk drive, using FDISK
or a similar application.
2. Boot with the Recovery CD (and the boot diskette if
required.)
3. Following message appears: “Your computer
originally included a Product Recovery program ...
Reinstall the Product Recovery Program? (Y/N) [ ]”.
Note: If the hard-disk drive contains any partitions, you
do not receive this message ; go to step 1.
4. Enter . The Service Partition is created and loadedY
with the Product Recovery program files.
Note: If you do not want to create the Service
Partition, press N key, and then go to step 8.
5. At next window, press Enter to continue.
v The Service Partition is created. The system
automatically reboots during this process.
v The recovery process copies some files to the
Service Partition and, PKUNZIPs others.
v Follow the prompts. You may be prompted to
change CDs.
v When the process is complete, the system reboots.
Continue to step 6 to install preloaded system.
Install preloaded system from CD:
6. Boot with the Recovery CD (and the boot diskette if
required.)
7. If the hard-disk drive is blank, the following message
appears: “Your computer originally included a
Product Recovery program ... Reinstall the
Product Recovery Program? (Y/N) [ ]”.
v To install the Service Partition, go to step 4.
v To preload the hard-disk drive without installing the
Service Partition, press the N key.
8. If you get a message asking which operating system
to install, highlight the proper operating system and
press Enter.
9. A message appears: . Press Enter to“ ”Full Recovery:
select.
10. Enter the at each of the next three windows.Y
11. Follow the prompts to complete Recovery.
To create a recovery repair diskette
If the prompt needed for access to the Product Recovery
program does not appear, you can recover it by use of the
Related service information
26 ThinkPad A20m/p, A21m/p, A22m/p
Power-on password:
A power-on password (POP) protects the system from
being powered on by an unauthorized person. The
password must be entered before an operating system can
be booted.
Hard-disk password:
There are two hard-disk passwords (HDPs):
v User HDP for the user—
v Master HDP for the system administrator, who can use—
it to get access to the hard disk even if the user has
changed the user HDP
Note: User onlyThere are two modes for the HDP: and
Master + User Master + User. The mode requires
two HDPs; the system administrator enters both in
the same operation. The system administrator then
provides the user HDP to the system user.
Attention
If the user HDP has been forgotten, check whether
a master HDP has been set. It it has, it can be used
for access to the hard-disk drive. If no master HDP
is available, IBM does not provide any services to
reset either the user or the master HDP, or to
recover data from the hard-disk drive. The hard-disk
drive can be replaced for a scheduled fee.
Supervisor password:
A supervisor password (SVP) protects the system
information stored in the IBM BIOS Setup Utility. The SVP
must be entered in order to get access to the IBM BIOS
Setup Utility and make changes to system configuration
settings.
Attention
If the SVP has been forgotten and cannot be made
available to the servicer, there is no service
procedure to reset the password. The systemboard
must be replaced for a scheduled fee.
How to remove the power-on password
To remove a POP that you have forgotten, do the
following:
(A) If no SVP has been set:
1. Turn off the computer.
2. Remove the battery pack.
Related service information
28 ThinkPad A20m/p, A21m/p, A22m/p
Power management
To reduce power consumption, the computer has three
power management modes: screen blank, standby, and
hibernation.
Notes
v Screen blank mode is called instandby mode
Windows 95 and Windows NT.
v Standby mode is called insuspend mode
Windows 95 and Windows NT.
Screen blank mode
Screen blank mode has three variants, as follows:
1. If you press Fn + F3, or the time set on the LCD off“
timer in IBM BIOS Setup Utility expires,”
v The LCD backlight turns off.
v The hard-disk drive motor stops.
v The speaker is muted.
2. If you are using the ACPI operating system and you
press Fn + F3,
v The LCD backlight turns off.
v The hard-disk drive motor stops.
3. If the time set on the Turn off monitor timer in the“ ”
operating system expires,
v The LCD backlight turns off.
To end screen blank mode and resume normal operation,
press any key.
Standby mode
When the computer enters standby mode, the following
events occur in addition to what occurs in screen blank
mode:
v The LCD is powered off.
v The hard-disk drive is powered off.
v The CPU stops.
To enter standby mode, press Fn + F4.
Note: You can change the action of Fn + F4, if you are
using the ACPI operating system.
In certain circumstances, the computer goes into standby
mode automatically:
v If a suspend time has been set on the timer, and the“ ”
user does not do any operation with the keyboard, the
TrackPoint, the hard disk, the parallel connector, or the
diskette drive within that time.
Related service information
30 ThinkPad A20m/p, A21m/p, A22m/p
v If the battery indicator blinks orange, indicating that the
battery power is low. (Alternatively, if Hibernate when
battery becomes low has been selected in the Power“
Management Properties window, the computer goes”
into hibernation mode.)
Note for the APM operating system:
Even if you do not set the low-battery alarm, the charge
indicator notifies you when the battery is low, and then the
computer enters the power-saving mode automatically.
This default low-battery behavior is independent of the
operating system; so if you have set the low-battery alarm,
the computer may not do what you specified. It chooses
either your setting or the default setting, whichever is
appropriate.
If you are using the ACPI operating system, only the
low-battery alarm is available.
To cause the computer to return from standby mode and
resume operation, do one of the following:
v Press the Fn key.
v Open the LCD cover (only if you are using Windows Me
and you entered standby mode by closing the LCD
cover.)
v Turn on the power switch.
Also, the computer automatically returns from standby
mode and resumes operation in either of the following
events:
v The ring indicator (RI) is signaled by a serial device or a
PC Card device (Windows 2000 does not support the
ring indicator (RI) resume by PC Card device.)
v The time set on the resume timer elapses. In Windows
98, the Scheduled Tasks setting takes priority over the
Resume on timer selection in the Power Management“
Properties window.”
Note: The computer does not accept any input
immediately after it enters standby mode. Wait a
few seconds before taking any action to reenter
operation mode.
Hibernation mode
Note for Windows NT
If you are using Windows NT in the default format,
NTFS, you cannot create a hibernation file. If you
want to use hibernation mode, you will need to
reinstall Windows NT with FAT format.
Related service information
General descriptions 31
Note for OS/2
If you are using OS/2 in the default format, HPFS,
you cannot create a hibernation file. If you want to
use hibernation mode, you will need to reinstall
OS/2 with FAT format.
In hibernation mode, the following occurs:
vThe system status, RAM, VRAM, and setup data are
stored on the hard disk.
vThe system is powered off.
Note: If the computer enters the hibernation mode while it
is docked to the docking station, do not undock it
from the docking station before resuming normal
operation. If you do undock it and then try to
resume normal operation, you will get an error
message, and you will have to restart the system.
To cause the computer to enter hibernation mode, do any
of the following:
vPress the Fn + F12 keys.
vIf you are using the APM operating system and have set
the mode to , turnPower switch mode [Hibernation]
off the power switch.
vIf you are using the ACPI operating system and have
defined one of the following actions as the event that
causes the system to go into hibernation mode, perform
that action.
–Closing the lid.
–Pressing the power button.
–Pressing Fn + F4 keys.
Also, the computer goes into hibernation mode
automatically in either of the following conditions:
vIf a hibernation time has been set on the timer, and the“ ”
user does not do any operation with the keyboard, the
TrackPoint, the hard-disk drive, the parallel connector, or
the diskette drive within that time.
vIf the timer conditions are satisfied in suspend mode.
vIf you are using the APM operating system and have set
the mode to ,Hibernate when battery becomes low
and the battery charge becomes critically low.
When the power is turned on, the computer returns from
hibernation mode and resumes operation. The hibernation
file in the boot record on the hard-disk drive is read, and
system status is restored from the hard-disk drive.
Related service information
32 ThinkPad A20m/p, A21m/p, A22m/p
Checkout guide
Use the following procedures as a guide in identifying and
correcting problems with the ThinkPad computer.
Note: The diagnostic tests are intended to test only IBM
products. The use of non-IBM products, prototype
cards, or modified options can lead to false
indications of errors and invalid system responses.
1. Identify the failing symptoms in as much detail as
possible.
2. Verify the symptoms. Try to re-create the failure by
running the diagnostic test or by repeating the
operation.
Testing the computer
The ThinkPad computer has a test program called
PC-Doctor
®
DOS (hereafter called ). You canPC-Doctor
detect errors by running the diagnostics test included in
PC-Doctor. This section is an overview of the procedure.
For details that depend on model-unique functions, refer to
“ ” Product overview on page 41.
For some possible configurations of the computer,
PC-Doctor might not run correctly. To avoid this problem,
you need to initialize the computer setup by use of the IBM
BIOS Setup Utility before you run PC-Doctor. On the IBM
BIOS Setup Utility screen, press F9, Enter, F10, and then
Enter.
Note: When you initialize the computer configuration,
some devices are disabled, such as the serial port.
If you test one of these devices, you will need to
enable it by using PS2.EXE.
PC-Doctor cannot be used to test a device that is in the
docking station, even if the computer supports the docking
station. To test a USB device, connect it to the USB
connector of the computer. To test the Ultrabay 2000
device, install it in the Ultrabay 2000 slot of the computer.
To run the test, do as follows:
Note: In the following procedure, you can select an item
not only with the arrow keys, but also with the
TrackPoint. Instead of pressing Enter, click the left
button.
1. Insert the PC-Doctor disk into the diskette drive; then
power on the computer.
If the computer cannot be powered on, go to Power“
system checkout on page 35, and check the power”
sources.
Checkout guide
General descriptions 33
If an error code appears, go to Symptom-to-FRU“
index on page 49.”
On the first screen, select the model and press Enter.
Follow the instructions on the screen.
2. The main panel of PC-Doctor appears.
3. Select with the arrow keys, and pressDiagnostics
Enter.
A pull-down menu appears. (Its exact form depends on
the model.)
The options on the test menu are as follows:
Diagnostics Interactive Tests
vRun Normal Test
vRun Quick Test
vCPU/Coprocessor
vSystemboard
vVideo Adapter
vSerial Ports
vParallel Ports
vFixed Disks
vDiskette Drives
vOther Devices
vZIP Drive (*)
vLS-120 Drive (*)
vCommunication
vMemory Test Full–
vMemory Test Quick–
vKeyboard
vVideo
vInternal Speaker
vMouse
vJoystick Test
vDiskette
vSystem Load
vCD-ROM/DVD Test
vStereo Speaker
Notes:
vIn the test inKeyboard Interactive Tests Fn, the key is
scanned only once. Each key should be held down for at least
2 seconds; otherwise, it cannot be sensed.
vThe sound card is not recognized in the in theStereo Speaker
Interactive Tests. To test it, use the audio device test in the
Other Devices Diagnostics( ).
vVideo Adapter test supports only the LCD display on
ThinkPad. Before running PC-Doctor DOS, detach the external
Monitor.
vZIP Drive LS-120 Drivetest and test are only for some
models. Some model do not have them.
Diagnostics Quit
I n t e r a c t i v e Te s t s Hard ware Inf o Ut i l i t y F1=Help
Run Quick Test
Run Normal Test
Systemboard
CPU/Coprocessor
Video Adapter
Serial Ports
Diskette Drives
Fixed Disks
Parallel Ports
Other Devices
ZIP Drive
Communication
Memory Test - Full
Memory Test - Quick
Use the cursor keys and ESC to move in menus. Press ENTER to select.
PC -D OC T OR 2 .0 C o py ri g ht 2 00 1 P C- Do ct or , I nc . A ll R i gh t s Re se rv ed .
4. Run the applicable function test.
Checkout guide
34 ThinkPad A20m/p, A21m/p, A22m/p
v“ ”Checking the ac adapter
v“ ”Checking operational charging
v“ ” Checking the battery pack on page 37
v“ ” Checking the backup battery on page 37
Checking the ac adapter
You are here because the computer fails only when the ac
adapter is used:
vIf the power problem occurs only when the port
replicator is used, replace the port replicator.
vIf the power-on indicator does not turn on, check the
power cord of the ac adapter for correct continuity and
installation.
vIf the computer does not charge during operation, go to
″ ″Checking operational charging.
To check the ac adapter, do the following:
1. Unplug the ac adapter cable from the computer.
2. Measure the output voltage at the plug of the ac
adapter cable. See the following figure:
2
1
(16 - 10 V)
Pin Voltage (V dc)
1 +15.5 to +17.0
2 Ground
3. If the voltage is not correct, replace the ac adapter.
4. If the voltage is acceptable, do the following:
vReplace the system board.
vIf the problem persists, go to Product overview on“ ”
page 41.
Note: Noise from the ac adapter does not always indicate
a defect.
Checking operational charging
To check whether the battery charges properly during
operation, use a discharged battery pack or a battery pack
that has less than 50% of the total power remaining when
installed in the computer.
Perform operational charging. If the battery status indicator
or icon does not turn on, remove the battery pack and let it
return to room temperature. Reinstall the battery pack. If
the charge indicator or icon still does not turn on, replace
the battery pack.
If the charge indicator still does not turn on, replace the
system board. Then reinstall the battery pack. If it is still
not charged, go to the next section.
Checkout guide
36 ThinkPad A20m/p, A21m/p, A22m/p
Checking the battery pack
Battery charging does not start until the Power Meter
shows that less than 95% of the total power remains;
under this condition the battery pack can charge to 100%
of its capacity. This protects the battery pack from being
overcharged or from having a shortened life.
To check the status of your battery, move your cursor to
the Power Meter icon in the icon tray of the Windows
taskbar and wait for a moment (but do not click), and the
percentage of battery power remaining is displayed. To get
detailed information about the battery, double-click the
Power Meter icon.
Note: If the battery pack becomes hot, it may not be able
to charge. Remove it from the computer and leave it
at room temperature for a while. After it cools down,
reinstall and recharge it.
To check the battery pack, do the following:
1. Power off the computer.
2. Remove the battery pack and measure the voltage
between battery terminals 1 (+) and 5 (−). See the
following figure:
5(-) 4321(+)
Terminal Voltage (V dc)
1 + 0 to + 12.6
5 Ground (−)
3. If the voltage is less than +11.0 V dc, the battery pack
has been discharged.
Note: Recharging will take at least 3 hours, even if the
indicator does not turn on.
If the voltage is still less than +11.0 V dc after
recharging, replace the battery.
4. If the voltage is more than +11.0 V dc, measure the
resistance between battery terminals 4 and 5. The
resistance must be 4 to 30 K .
If the resistance is not correct, replace the battery
pack. If the resistance is correct, replace the system
board.
Checking the backup battery
Do the following:
1. Power off the computer, and unplug the ac adapter
from it.
2. Turn the computer upside down.
Checkout guide
General descriptions 37
3. Remove the battery pack (see 1010 Battery pack on“ ”
page 60 ).
4. Remove the backup battery (see Checking the battery“
pack on page 37).”
5. Measure the voltage of the backup battery. See the
following figure.
Red (+)
Black (-)
Wire Voltage (V dc)
Red +2.5 to +3.2
Black Ground
vIf the voltage is correct, replace the system board.
vIf the voltage is not correct, replace the backup battery.
vIf the backup battery discharges quickly after
replacement, replace the system board.
Checkout guide
38 ThinkPad A20m/p, A21m/p, A22m/p
12.1-in. panel . . . . . . . . . . . 96
14.1-in. and 15.0-in. panels . . . . . . . 97
2030 Inverter card . . . . . . . . . . 99
12.1-in. panel . . . . . . . . . . . 99
14.1-in. and 15.0-in. panels . . . . . . 100
2040 LCD panel . . . . . . . . . . . 101
12.1-in. panel. . . . . . . . . . . 101
14.1-in. and 15.0-in. panels . . . . . . 103
3010 ThinkPad Dock PCI cover . . . . . . 105
3020 ThinkPad Dock top cover . . . . . . 107
Locations . . . . . . . . . . . . . . 112
Front view. . . . . . . . . . . . . 112
Rear view . . . . . . . . . . . . . 113
Bottom view . . . . . . . . . . . . 114
Parts list . . . . . . . . . . . . . . 115
A series model matrix . . . . . . . . . 115
Overall . . . . . . . . . . . . . 123
AC adapter . . . . . . . . . . . . 136
LCD FRUs . . . . . . . . . . . . 136
12.1-in. SVGA TFT . . . . . . . . . 136
14.1-in. XGA TFT . . . . . . . . . 137
15.0-in. XGA TFT (LG) . . . . . . . . 138
15.0-in. XGA TFT (SAMSUNG) . . . . . 138
15.0-in. SXGA+ TFT . . . . . . . . 139
15.0-in. UXGA TFT . . . . . . . . . 139
Keyboard . . . . . . . . . . . . . 140
Recovery CDs . . . . . . . . . . . 141
For Windows 98 (A22m) . . . . . . . 141
For Windows 98 (A22p) . . . . . . . 142
For Windows 2000 (A22m). . . . . . . 143
For Windows 2000 (A22p) . . . . . . . 143
For Windows 2000/Windows NT (A22m) 143
For Windows 2000/Windows NT (A22p) . . . 144
Miscellaneous parts . . . . . . . . . . 145
Optional FRUs . . . . . . . . . . . 147
Common parts list . . . . . . . . . . 148
Tools . . . . . . . . . . . . . 148
Power cords (system) . . . . . . . . 148
Power cords (docking station) . . . . . . 149
Notices . . . . . . . . . . . . . . 150
Trademarks . . . . . . . . . . . . 150
40 ThinkPad A20m/p, A21m/p, A22m/p
Product overview
This section presents the following product-unique
information:
v“ ”Specifications
v“ ” Status indicators on page 44
v“ ” FRU tests on page 46
v“ ” Fn key combinations on page 48
Specifications
The following table lists the specifications of the ThinkPad
A20m/p, A21m/p and A22m/p series:
Feature Description
Processor A20m
vIntel
®
Celeron
®
processor 500 MHz, L2
256-KB cache
vIntel
®
Celeron
®
processor 550 MHz, L2
256-KB cache
vMobile Intel
®
Pentium
®
III processor
500 MHz, L2 256-KB cache
vMobile Intel
®
Pentium
®
III processor at
600 MHz featuring Intel
®
SpeedStep
™
technology
vMobile Intel
®
Pentium
®
III processor at
650 MHz featuring Intel
®
SpeedStep
™
technology
vMobile Intel
®
Pentium
®
III processor at
700 MHz featuring Intel
®
SpeedStep
™
technology
A20p
vMobile Intel
®
Pentium
®
III processor at
700 MHz featuring Intel
®
SpeedStep
™
technology
vMobile Intel
®
Pentium
®
III processor at
750 MHz featuring Intel
®
SpeedStep
™
technology
A21m
vMobile Intel
®
Pentium
®
III processor at
700 MHz featuring Intel
®
SpeedStep
™
technology
vMobile Intel
®
Pentium
®
III processor at
750 MHz featuring Intel
®
SpeedStep
™
technology
vMobile Intel
®
Pentium
®
III processor at
800 MHz featuring Intel
®
SpeedStep
™
technology
(continued)
Product overview
ThinkPad A20m/p, A21m/p and A22m/p 41
Feature Description
Diskette drive 1.44 MB (3-mode), 3.5-inch
Hard-disk drive A20m/p
v6.0 GB, 2.5-inch, IDE interface
v12.0 GB, 2.5-inch, IDE interface
v18.0 GB, 2.5-inch, IDE interface
v20.0 GB, 2.5-inch, IDE interface
A21m/p
v10.0 GB, 2.5-inch, IDE interface
v20.0 GB, 2.5-inch, IDE interface
v32.0 GB, 2.5-inch, IDE interface
A22m/p
v10.0 GB, 2.5-inch, IDE interface
v20.0 GB, 2.5-inch, IDE interface
v30.0 GB, 2.5-inch, IDE interface
v32.0 GB, 2.5-inch, IDE interface
I/O port External monitorv
vLine-in
vHeadphone
vMicrophone
vMouse or keyboard
vParallel
vPort replicator connector
vSerial
vUniversal serial bus (USB) connector
vRJ11
vRJ45
vTV-in/out (for MT2629)
vTV-out (for MT2628-Fxx, Gxx, Sxx, Txx,
MT2623-Gxx, Txx)
Internal modem 56.6 Kbps
Audio Internal microphone (for A20m/p,v
A21m/p)
vInternal speaker
vSoftware control volume
Infrared transfer IrDA 1.1
PC Card One Type-III or two Type-II
AC adapter 72-watt type
Bay device A20m/p
v10-24 x CD-ROM drive
v6 x DVD drive
A21m/p, A22m/p
v10-24 x CD-ROM drive
v8 x DVD drive
Product overview
ThinkPad A20m/p, A21m/p and A22m/p 43
Indicator Meaning
4 Num lock The numeric keypad on the keyboardGreen:
is enabled. To enable or disable the
keypad, press and hold the Shift key
while pressing the NumLk key.
5 Caps lock Caps Lock mode is enabled. ToGreen:
enable or disable Caps Lock mode,
press Caps Lock key.
6 Scroll lock Scroll Lock mode is enabled. ArrowGreen:
keys can be used as screen-scroll
function keys, but not to move the
cursor. To enable or disable Scroll
Lock mode, press ScrLk key. Not all
application programs support this
function.
7 Power on This indicator stays lighted wheneverGreen:
the computer is on. If the power-on
indicator is on and the standby
indicator is off, the system is ready to
use. If both the power-on indicator
and the standby indicator are on, you
can use the computer after it returns
from the standby mode and the
standby indicator goes off.
Product overview
ThinkPad A20m/p, A21m/p and A22m/p 45
unique IDs until the year A.D. 3400. No two computers in
the world have the same number.
When you replace the system board, you must set the
UUID on the new system board as follows:
1. Install the ThinkPad hardware maintenance diskette
version 1.62, and restart the computer.
2. From the main menu, select .4. Assign UUID
A new UUID is created and written. If a valid UUID
already exists, it is not overwritten.
FRU replacement notices
58 ThinkPad A20m/p, A21m/p, A22m/p
Product specificaties
| Merk: | Ibm |
| Categorie: | Laptop |
| Model: | ThinkPad A22 |
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