IBM thinkpad a21e (2000) schematic

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IBM Mobile Systems
ThinkPad Computer
Hardware Maintenance Manual

Note

Before using this information and the product it
supports, be sure to read the general information
under “Notices” on page 100.

Second Edition (December 2000)
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 2000. All rights reserved. Note to U.S.

Government Users – Documentation related to restricted
rights – Use, duplication, or disclosure is subject to
restrictions set forth in GSA ADP Schedule Contract with
IBM Corp.

© Copyright IBM Corp. 2000

Contents

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............12

General safety............12

Electrical safety ...........13

Safety inspection guide .........14

Handling electrostatic discharge-sensitive devices 15

Grounding requirements .........16

Laser compliance statement.........16

General descriptions ..........19

Read this first .............19

What to do first: ...........19

Related service information .........21

Service Web site ...........21

Using Recovery CD ..........21

Passwords .............22

Power management ..........24

Checkout guide ............27

Testing the computer ..........27

Detecting system information with PC-Doctor. . . 29

Power system checkout .........29

ThinkPad A21e ............33

Product overview ............35

Specifications ............35

Status indicators ...........36

FRU Tests .............38

Fn key combinations ..........40

Symptom-to-FRU index ..........41

Numeric error codes ..........41

Error messages ...........44

Beep symptoms ...........45

No beep symptoms ..........45

LCD-related symptoms .........46

Intermittent problems ..........46

Undetermined problems .........47

FRU replacement notices .........47

Screw notices ............47

Retaining serial numbers.........48

Removing and replacing a FRU........50

1010 Battery pack...........51

1020 DIMM ............52

1030 Mini PCI adapter .........53

1040 Backup battery ..........55

1050 Hard-disk drive ..........56

iii

1060 Ultrabay 2000 device ........58

1070 Keyboard ...........60

1080 Keyboard CRU insulator .......63

1090 Hinge cover ...........64

1100 Keyboard bezel and speaker ......65

1110 Speaker cable ..........67

1120 Sub card............68

1130 PC Card slot assembly .......70

1140 Fan assembly ..........71

1150 Diskette drive ..........73

1160 Upper shield...........74

1170 System board ..........75

2010 LCD assembly ..........77

2020 Front bezel ...........79

2030 Inverter card ..........81

2040 LCD panel ...........83

Locations ..............87

Front view .............87

Rear view .............88

Bottom view ............89

Parts list ..............90

LCDFRU.............93

Keyboard .............95

Miscellaneous parts ..........96

Optional FRUs............98

Common parts list...........99

Notices ..............100

Trademarks ............100

iv ThinkPad A21e

Introduction

Important service information

Important

Diskette fixes are customer-installable. The diskette

fixes are posted on the IBM support site

(http://www.pc.ibm.com/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:

v If you are instructed to replace a FRU but the

replacement does not correct the problem, reinstall
the original FRU before you continue.

v Some 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.

v If 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.

1

Important service information

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.

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

3.5-inch 1.0 MB Read and write

2 ThinkPad A21e

Diskette
capacity

2.0 MB Read and write

4.0 MB Not compatible

Compatibility

Safety notices

Safety notices: multilingual translations

In this manual, safety notices appear in English with a
page number reference to the appropriate translation in
this section.

The safety notices are provided in English, French,
German, Italian, and Spanish, as follows:

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 unité en clientèle, vérifiez que

tous les ressorts, vis et autres pièces sont bien en

place et bien fixées. Pour ce faire, secouez l’unité et

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, muß sichergestellt

werden, daß keine Schrauben, Federn oder andere

Kleinteile fehlen oder im Gehäuse vergessen

wurden. Der Computer muß geschüttelt und auf

Klappergeräusche geprüft werden. Metallteile

oder-splitter können Kurzschlüsse erzeugen.

Prima di accendere l’elaboratore dopo che é stata

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 ci

ÚÚ 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.

Introduction 3

Safety notices

Safety notice 2

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)

4 ThinkPad A21e

Safety notices

Continuation of Safety notice 2

Alcune batterie di riserva contengono una piccola

quantità di nichel e cadmio. Non smontarle,

ricaricarle, gettarle nel fuoco o nell’acqua né

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 baterías de reserva contienen una pequeña

cantidad de níquel y cadmio. No las desmonte, ni

recargue, ni las eche al fuego o al agua ni las

cortocircuite. Deséchelas tal como dispone la

normativa local. Utilice sólo baterías que se

encuentren en la lista de piezas. La utilizaciónde

una batería no apropiada puede provocar la ignición

o explosión de la misma.

Introduction 5

Safety notices

Safety notice 3

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 démontez pas,
ne l’exposez ni au feu ni à l’eau. Ne la mettez pas
en court- circuit. Pour la mettre au rebut,
conformez-vous à la réglementation en vigueur.
Lorsque vous remplacez la batterie, veillez à
n’utiliser que les modèles cités dans la liste de
pièces détachées adéquate. En effet, une batterie
inappropriée risque de prendre feu ou d’exploser.

Akkus enthalten geringe Mengen von Nickel. Sie
dürfen nicht zerlegt, wiederaufgeladen,
kurzgeschlossen, oder Feuer oder Wasser
ausgesetzt werden. Bei der Entsorgung die örtlichen
Bestimmungen für Sondermüll beachten. Beim
Ersetzen der Batterie nur Batterien des Typs
verwenden, der in der Ersatzteilliste aufgeführt ist.
Der Einsatz falscher Batterien kann zu Entzündung
oder Explosion führen.

La batteria contiene piccole quantità di nichel. Non
smontarla, gettarla nel fuoco o nell’acqua né
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.

Las baterías contienen pequeñas cantidades de
níquel. No las desmonte, ni recargue, ni las eche al
fuego o al agua ni las cortocircuite. Deséchelas tal
como dispone la normativa local. Utilice sólo
baterías que se encuentren en la lista de piezas al
sustituir la batería. La utilización de una bateríano
apropiada puede provocar la ignición o explosiónde
la misma.

6 ThinkPad A21e

Safety notices

Safety notice 4

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

présente des risques d’incendie, d’explosion ou de

brûlures graves. Ne la rechargez pas, ne retirez pas

son connecteur polarisé et ne la démontez pas. Ne

l’exposez pas à une temperature supérieure à

100°C, ne la faites pas brûler et n’en exposez pas

le contenu à l’eau. Mettez la pile au rebut

conformément à la réglementation en vigueur. Une

pile inappropriée risque de prendre feu ou

d’exploser.

Die Systembatterie ist eine Lithiumbatterie. Sie kann

sich entzünden, explodieren oder schwere

Verbrennungen hervorrufen. Batterien dieses Typs

dürfen nicht aufgeladen, zerlegt, über 100 C erhitzt

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 örtlichen

Bestimmungen für Sondermüll beachten. Beim

Ersetzen der Batterie nur Batterien des Typs

verwenden, der in der Ersatzteilliste aufgeführt ist.

Der Einsatz falscher Batterien kann zu Entzündung

oder Explosion führen.

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

ol’esplosione della batteria stessa.

(continued)

Introduction 7

Safety notices

Continuation of Safety notice 4

La batería de repuesto es una batería de litio y
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.
Deséchela tal como dispone la normativa local.

8 ThinkPad A21e

Safety notices

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 à cristaux liquides se

brise et que vous recevez dans les yeux ou sur les

mains une partie du fluide, rincez-les abondamment

pendant au moins quinze minutes. Consultez un

médecin si des symptômes persistent aprèsle

lavage.

Die Leuchtstoffröhre im LCD-Bildschirm enthält

Quecksilber. Bei der Entsorgung die örtlichen

Bestimmungen für Sondermüll beachten. Der

LCD-Bildschirm besteht aus Glas und kann

zerbrechen, wenn er unsachgemäß behandelt wird

oder der Computer auf den Boden fällt. Wenn der

Bildschirm beschädigt ist und die darin befindliche

Flüssigkeit in Kontakt mit Haut und Augen gerät,

sollten die betroffenen Stellen mindestens 15

Minuten mit Wasser abgespült und bei

Beschwerden anschließend ein Arzt 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 áreas afectadas con agua

durante 15 minutos como mínimo. Obtenga atención

medica si se presenta algúnsíntoma del fluido

despues de lavarse.

Introduction 9

Safety notices

Safety notice 6

To avoid shock, do not remove the plastic cover that
protects the lower part of the inverter card.

Afin d’éviter tout risque de choc électrique, ne
retirez pas le cache en plastique protégeant la
partie inférieure de la carte d’alimentation.

Aus Sicherheitsgründen die Kunststoffabdeckung,
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
plástico que rodea la parte baja de la tarjeta
invertida.

Safety notice 7

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 élevé, le court-circuit ou la mise à la masse
d’une batterie peut produire suffisamment de
courant pour brûler des matériaux combustibles ou
causer des brûlures corporelles graves.

Obwohl Hauptbatterien eine niedrige Spannung
haben, können sie doch bei Kurzschluß oder
Erdung genug Strom abgeben, um brennbare
Materialien zu entzünden oder Verletzungen bei
Personen hervorzurufen.

Sebbene le batterie di alimentazione siano a basso
voltaggio, una batteria in corto circuito o a massa
può fornire corrente sufficiente da bruciare materiali
combustibili o provocare ustioni ai tecnici di
manutenzione.

Aunque las baterías principales tienen un voltaje
bajo, una batería cortocircuitada o con contacto a
tierra puede producir la corriente suficiente como
para quemar material combustible o provocar
quemaduras en el personal.

10 ThinkPad A21e

Safety notices

Safety notice 8

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 unité remplaçable en clientèle,

mettez le système hors tension, débranchez tous

les cordons d’alimentation des socles de prise de

courant, retirez la batterie et déconnectez tous les

cordons d’interface.

Die Stromzufuhr muß abgeschaltet, alle Stromkabel

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 eléctrica, quite la batería y, a continuación,

desconecte cualquier cable de conexión entre

dispositivos.

Introduction 11

Safety information

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.

12 ThinkPad A21e

Safety information

Electrical safety

Observe the following rules when working on electrical
equipment.

Important

Use only approved tools and test equipment. Some
hand tools have handles covered with a soft
material that does not insulate you when working
with live electrical currents.

Many customers have, near their equipment, rubber
floor mats that contain small conductive fibers to
decrease electrostatic discharges. Do not use this
type of mat to protect yourself from electrical shock.

v Find the room emergency power-off (EPO) switch,

disconnecting switch, or electrical outlet. If an electrical
accident occurs, you can then operate the switch or
unplug the power cord quickly.

v Do not work alone under hazardous conditions or near

equipment that has hazardous voltages.

v Disconnect all power before:

– Performing a mechanical inspection
– Working near power supplies
– Removing or installing main units

v Before you start to work on the machine, unplug the

power cord. If you cannot unplug it, ask the customer to
power-off the wall box that supplies power to the
machine and to lock the wall box in the off position.

v If you need to work on a machine that has exposed

electrical circuits, observe the following precautions:
– Ensure that another person, familiar with the

power-off controls, is near you.
Attention: Another person must be there to switch

off the power, if necessary.

– Use only one hand when working with powered-on

electrical equipment; keep the other hand in your
pocket or behind your back.

Attention: An electrical shock can occur only when
there is a complete circuit. By observing the above
rule, you may prevent a current from passing through
your body.

– When using testers, set the controls correctly and

use the approved probe leads and accessories for
that tester.

– Stand on suitable rubber mats (obtained locally, if

necessary) to insulate you from grounds such as
metal floor strips and machine frames.

Observe the special safety precautions when you work
with very high voltages; these instructions are in the

Introduction 13

Safety information

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, check that it has been powered off.

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

v Mechanical hazards, such as loose or missing hardware

14 ThinkPad A21e

Safety information

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. Athird-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.
v Wear a grounded wrist strap against your skin to

eliminate static on your body.

Introduction 15

Safety information

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 a CD-ROM drive or DVD drive. CD-ROM
drives or DVD drives are also sold separately as options.
The CD-ROM drive or DVD drive is a laser product. The
CD-ROM drive or DVD 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.

16 ThinkPad A21e

Laser compliance statement

When a CD-ROM drive or DVD drive is installed, note the
following:

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
exposição à radiação.

Pour éviter tout risque d’exposition au rayon
laser, respectez les consignes de réglage et
d’utilisation des commandes, ainsi que les
procédures décrites.

Werden Steuer- und Einstellelemente anders
als hier festgesetzt verwendet, kann
gefährliche Laserstrahlung 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 aquí
especificados puede provocar la exposición a
radiaciones peligrosas.

Opening the CD-ROM drive or DVD drive could result in
exposure to hazardous laser radiation. There are no
serviceable parts inside the CD-ROM drive or DVD drive.

Do not open.

Introduction 17

Laser compliance statement

Some CD-ROM drives or DVD drives contain an
embedded Class 3A or Class 3B laser diode. Note the
following:

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.

Radiação por raio laser ao abrir. Não olhe fixo
no feixe de luz, não olhe diretamente por meio
de instrumentos óticos e evite exposição direta
com o feixe de luz.

Rayonnement laser si carter ouvert. Évitez de
fixer le faisceau, de le regarder directement
avec des instruments optiques, ou de vous
exposer au rayon.

Laserstrahlung bei geöffnetem Gerät. Nicht
direkt oder über optische Instrumente in den
Laserstrahl sehen und den Strahlungsbereich
meiden.

Kinyitáskor lézersugár!Nenézzen bele se
szabad szemmel, se optikai eszközökkel.
Kerülje a sugárnyalábbal valóérintkezést !

Aprendo l’unità vengono emesse radiazioni
laser. Non fissare il fascio, non guardarlo
direttamente con strumenti ottici e evitare
l’esposizione diretta al fascio.

Radiaciónláser al abrir. No mire fijamente ni
examine con instrumental óptico el haz de luz.
Evite la exposición directa al haz.

18 ThinkPad A21e

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

19

Read this first

__ 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.

20 ThinkPad A21e

Related service information

Related service information

This section provides information about the following:

v “Service Web site”
v “Using Recovery CD”
v “Passwords”on page 22
v “Power management” on page 24

Service Web site

When the latest maintenance diskette and the system
program service diskette are available, a notice will be
posted on http://www.pc.ibm.com/partner/infotips/

Using Recovery CD

To create Service Partition and install the preloaded
system from Recovery CD, do the following;

To create Service Partition [SP]:

1. Erase all partitions on the hard-disk drive using FDISK
or similar application.

2. Boot with Recovery CD (and boot diskette if required).

3. Amenu will appear stating “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

4. Enter “Y” and Service Partition will be created and

will not receive this menu — go to step 1.

loaded with D2D files.
Note: If you do not want to create Service Partition,

5. Press “ENTER” at next window to continue.

Install preloaded system from CD:

6. Boot with Recovery CD (and boot diskette if required)

7. If the hard-disk drive is blank, a menu will appear

press “N”, and then go to step 8.

v Service Partition will be created. System will

automatically reboot during this precess.

v Recovery process will copy some files to the Service

Partition, PKUNZIP others

v Follow prompts — you may be prompted to change

CDs.

v System will reboot when complete, continue to step

6 to install preloaded system.

stating “Your computer originally included a

Product Recovery program ... Reinstall the
Product Recovery Program? (Y/N) [ ]”.

v To install Service Partition, go to step 4.
v To preload hard-disk drive without installing Service

Partition, press “N”.

General descriptions 21

Related service information

8. If a menu appears asking which operating system to
install, highlight proper operating system and press
“ENTER”.

9. Amenu will appear stating “Full Recovery:”. Press
“ENTER” to select.

10. Enter “Y” at the three windows which follow.

11. Follow prompts to complete Recovery.

Passwords

As many as three passwords may be needed for any
ThinkPad computer: the power-on password (POP), the
hard-disk password (HDP), and the supervisor password
(SVP).

Exception: If only SVP is installed, the password prompt

When any of these passwords is used, a password prompt
appears on the screen whenever the computer is turned
on. The computer does not start until the password is
entered.

doesn’t appear when the operating system is
booted.

Power-on password:

A power-on password (POP) protects the system from
being powered on by an unauthorized person. Without
knowing the password, nobody can start the system.

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: There are two modes for the HDP: User only and

Master + User. You can enter two HDPs when you
select Master + User.

Attention

If the master HDP has been forgotten, there is no
way to delete it. But you can still get access to the
hard disk if you remember the user HDP. If both
user HDP and master HDP have been forgotten, the
password cannot be removed and the hard disk will
not be accessible.

Supervisor password:

A supervisor password (SVP) protects the system
information stored in the IBM BIOS Setup Utility so that

22 ThinkPad A21e

Related service information

without knowing the password, nobody can change the
configuration of the computer.

Attention

If the SVP has been forgotten, there is no way to
reset it.

How to remove the power-on password

To remove a POP that you have forgotten, do the
following:

(A) If SVP is not installed:

1. Turn off the computer.

2. Remove the battery pack.
For how to remove the battery pack, see “1010 Battery

pack” on page 51.

3. Remove the backup battery.
For how to remove the backup battery, see “1040

Backup battery” on page 55.

4. Turn on the computer and wait until the POST ends.
After the POST ends, the password prompt does not

appear. The POP has been removed.

5. Reinstall the backup battery and the battery pack.

(B) If SVP is installed:

1. Turn on the computer by pressing and holding F1.

2. Enter the SVP. The IBM BIOS Setup Utility menu
appears.

3. Select Password, using the cursor keys to move down
the menu.

4. Select Power-On Password.

5. Enter the SVP, at the Enter Current Password field.

6. When the Enter New Password field opens, leave it
blank and press Enter twice.

7. Press Enter in the Changes have been saved window.

8. Press F10; then select Yes in the Setup confirmation
window.

How to remove the hard-disk password

Attention

If User only mode is selected and the user HDP is
forgotten, there is no way to reset it.

General descriptions 23

Related service information

To remove the user HDP that you have forgotten, do the
following:

1. Power on the computer by pressing and holding F1.

2. Enter the SVP. The IBM BIOS Setup Utility menu
appears.

3. Select Password, using the cursor keys to move down
the menu.

4. Select Hard-disk x password, where x is the letter of
the hard-disk drive. A pop-up window opens.

5. Select either User HDP or Master HDP.

6. Enter the master HDP; then leave the New Password
field blank and press Enter twice.

7. Press F10.

8. Select Yes in the Setup Configuration window.
The both user HDP and master HDP have been

removed.

Power management

To reduce power consumption, the computer has three
power management modes: screen blank (standby in
Windows 95 and Windows NT) , standby (suspend in
Windows 95 and Windows NT), and hibernation.

Note for standby mode and hibernation mode

Do not install or remove the UltraBay during standby
mode or hibernation mode. The UltraBay of
ThinkPad A21e supports only cold-swap. If you try
to do warm-swap, the UltraBay LED starts to blink
with beep sound.

Screen blank mode:

In screen blank mode, the following occurs:

v The LCD backlight turns off.
v The hard-disk drive motor stops.
v The speaker is muted.

To enter screen blank mode, press Fn + F3. 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, do any of the following:

v Press Fn + F4.
v Close the LCD cover. (To prevent the computer from

entering standby mode when the LCD is closed, click

24 ThinkPad A21e

Related service information

Will not suspend even if LCD is closed in the Power
Management Properties window. Then only the LCD
turns off.)

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 the time set.

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: Even if you don’t set the low-battery alarm, the

charge indicator lets you know that 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.

Any one of the following events causes the computer to
resume operation from standby mode:

v The Fn key is pressed.
v The LCD cover is opened.
v The ring indicator (RI) is signaled by a serial device or a

PC Card device.

v The power switch is turned on.
v The resume timer is set. In Windows which has the

Scheduled Tasks, the Scheduled Tasks setting has
priority over the setting in IBM BIOS Setup Utility.

Note: The computer does not accept any input

immediately after it enters suspend 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.

In hibernation mode, the following occurs:

General descriptions 25

Related service information

v The system status, RAM, VRAM, and setup data are

stored on the hard disk.

v The system is powered off.

Notes:

The computer cannot enter hibernation mode when
it is powered with ac power and a communication
PC Card is used.

Any one of the following events causes the computer to
enter hibernation mode when the hibernation file is
created:

v The Fn + F12 keys are pressed.
v The power switch is turned off and the mode is set to

Power switch mode [Hibernation].

v The timer conditions are satisfied in suspend mode (for

operating systems other than Windows 98).

v Acritically low battery condition occurs.
When the power is turned on, the computer leaves

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.

26 ThinkPad A21e

Checkout guide

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 PC-Doctor). You can
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 35.

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 29, and check the power
sources.

General descriptions 27

Checkout guide

If an error code appears, go to “Symptom-to-FRU
index” on page 41.

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 Diagnostics with the arrow keys, and press
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

v Run Normal Test
v Run Quick Test
v CPU/Coprocessor
v Systemboard
v Video Adapter
v Serial Ports
v Parallel Ports
v Fixed Disks
v Diskette Drives

v Keyboard
v Video
v Internal Speaker
v Mouse
v Joystick Test
v Diskette
v System Load
v CD-ROM/DVD Test

v Stereo Speaker
v Other Devices
v Communication
v Memory Test – Full
v Memory Test – Quick

Notes:

v In the Keyboard test in Interactive Tests, the Fn key

is scanned only once. Each key should be held down
for at least 2 seconds; otherwise, it cannot be sensed.

v Video Adapter test supports only the LCD display on

ThinkPad. Before running PC-Doctor DOS, detach the
external Monitor.

4. Run the applicable function test.

5. Follow the instructions on the screen. If there is a
problem, PC-Doctor shows messages describing it.

6. To exit the test, select Quit — Exit Diag.

28 ThinkPad A21e

Checkout guide

To cancel the test, press Esc.

Note: After executing PC-Doctor, check the system

time/date and reset them if needed.

Detecting system information with PC-Doctor

PC-Doctor can detect the following system information:

Hardware Info

v System Configuration
v Memory Contents
v Physical Disk Drives
v Logical Disk Drives
v VGAInformation
v IDE Drive Info
v PCI Information
v PNPISAInfo
v SMBIOS Info
v VESALCD Info

Utility

v Run External Tests
v Surface Scan Hard Disk
v Benchmark System
v DOS Shell
v Tech Support Form
v Battery Rundown
v View Test Log
v Print Log
v Save Log
v Full Erase Hard Drive
v Quick Erase Hard Drive

Power system checkout

To verify a symptom, do the following:

1. Power off the computer.

2. Remove the battery pack.

3. Connect the ac adapter.

4. Check that power is supplied when you power on the
computer.

5. Power off the computer.

6. Disconnect the ac adapter and install the charged
battery pack.

7. Check that the battery pack supplies power when you
power on the computer.

If you suspect a power problem, see the appropriate one
of the following power supply checkouts:

v “Checking the ac adapter” on page 30
v “Checking operational charging” on page 30
v “Checking the battery pack” on page 31

General descriptions 29

Checkout guide

v “Checking the backup battery” on page 32

Checking the ac adapter

You are here because the computer fails only when the ac
adapter is used:
v If the power problem occurs only when the port

replicator is used, replace the port replicator.

v If the power-on indicator does not turn on, check the

power cord of the ac adapter for correct continuity and
installation.

v If 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:

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:

v Replace the system board.
v If the problem persists, go to “Product overview” on

page 35.

5.

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.

30 ThinkPad A21e

Checkout guide

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:

Terminal Voltage (V dc)

1 + 0 to + 12.6
5 Ground (−)

5

3. for Lithium ion battery;
v 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.

for Nickel metal hydride battery;

v If the voltage is less than +8.0 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 +8.0 V dc after
recharging, replace the battery.

4. for Lithium ion battery;
v 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 ohm.

General descriptions 31

Checkout guide

for Nickel metal hydride battery;

v If the voltage is more than +8.0 V dc, measure the

resistance between battery terminals 4 and 5. The
resistance must be 4 to 30 K ohm.

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.

3. Remove the battery pack (see “1010 Battery pack” on
page 51).

4. Remove the backup battery (see “Checking the battery
pack” on page 31).

5. Measure the voltage of the backup battery. See the
following figure.

Wire Voltage (V dc)

Red +2.5 to +3.2
Black Ground

v If the voltage is correct, replace the system board.
v If the voltage is not correct, replace the backup battery.
v If the backup battery discharges quickly after

replacement, replace the system board.

32 ThinkPad A21e

ThinkPad A21e

Product overview ............35

Specifications ............35

Status indicators ...........36

FRU Tests .............38

Fn key combinations ..........40

Symptom-to-FRU index ..........41

Numeric error codes ..........41

Error messages ...........44

Beep symptoms ...........45

No beep symptoms ..........45

LCD-related symptoms .........46

Intermittent problems ..........46

Undetermined problems .........47

FRU replacement notices .........47

Screw notices ............47

Retaining serial numbers.........48

Restoring the serial number of the system unit 49

Retaining the UUID .........49

Removing and replacing a FRU........50

1010 Battery pack...........51

1020 DIMM ............52

1030 Mini PCI adapter .........53

1040 Backup battery ..........55

1050 Hard-disk drive ..........56

1060 Ultrabay 2000 device ........58

1070 Keyboard ...........60

1080 Keyboard CRU insulator .......63

1090 Hinge cover ...........64

1100 Keyboard bezel and speaker ......65

1110 Speaker cable ..........67

1120 Sub card............68

1130 PC Card slot assembly .......70

1140 Fan assembly ..........71

1150 Diskette drive ..........73

1160 Upper shield...........74

1170 System board ..........75

2010 LCD assembly ..........77

2020 Front bezel ...........79

2030 Inverter card ..........81

12.1-in. panel ...........81

14.1-in. and 15.0-in. panels .......82

2040 LCD panel ...........83

12.1-in. panel ...........83

14.1-in. and 15.0-in. panels .......85

Locations ..............87

Front view .............87

Rear view .............88

Bottom view ............89

Parts list ..............90

LCDFRU.............93

33

12.1-in. SVGA TFT .........93

14.1-in. XGA TFT ..........93

15.0-in. XGA TFT ..........93

15.0-in. XGA TFT (LG) ........94

Keyboard .............95

Miscellaneous parts ..........96

Optional FRUs............98

Common parts list...........99

Tools .............99

Power cords (system) ........99

Notices ..............100

Trademarks ............100

34 ThinkPad A21e

Product overview

Product overview

This section presents the following product-unique
information:

v “Specifications”
v “Status indicators” on page 36
v “FRU Tests” on page 38
v “Fn key combinations” on page 40

Specifications

The following table lists the specifications of the ThinkPad
A21e series:

Feature Description

Processor Intel

Bus architecture PCI Bus
Memory (standard) 64 MB (SO DIMM x 1)
Memory (optional) 64 MB or 128 MB DIMM card

CMOS RAM 114 bytes
Display v 12.1-inch, 16M colors, SVGA

Diskette drive 1.44 MB (3-mode), 3.5-inch
Hard-disk drive 10.0 GB, 2.5-inch, IDE interface
I/O port v External monitor

Internal modem 56.6 Kbps
Audio v Internal speaker

PC Card One Type-III or Type-II or Type-I
AC adapter 72-watt type
Bay device 10-24 x CR-ROM drive

®

Celeron®processor 600 MHz,

L2 128–KB cache

(maximum of 256 MB)

(800×600 resolution) TFT color
LCD

v 14.1-inch, 16M colors, XGA

(1024×768 resolution) TFT color
LCD

v 15.0-inch, 16M colors, XGA

(1024×768 resolution) TFT color
LCD

v Line-in
v Headphone
v Microphone
v Mouse or keyboard
v Parallel or diskette drive
v Port replicator connector
v Serial
v Universal serial bus (USB)

connector

v RJ11
v RJ45

v Software control volume

ThinkPad A21e 35

Product overview

Status indicators

The system status indicators show the status of the
computer, as follows:

Indicator Meaning
1 Battery Green: The battery is fully charged.

Blinking green:

The battery has enough power
to operate, but is being
charged.

Orange: The battery power is low. The

battery is to being charged.

Blinking orange:

The battery needs to be
charged. when the indicator
starts blinking orange, the
computer beeps three times.

2 Standby status Green: The computer is in standby

Blinking green:

mode.

The computer is entering
standby mode or hibernation
mode, or is resuming normal
operation. This indicator does
not blink in Windows 98,
Windows 2000 and Windows
Me.

(continued)

36 ThinkPad A21e

Product overview

Indicator Meaning
3 Drive in use Green: Data is being read from or

Note: Do not move the system while the

Green drive in use light is on. Sudden
physical shock could cause drive errors.

4 Num lock Green: The numeric keypad on the

written to the hard-disk drive,
the diskette drive, or the drive
in the Ultrabay 2000. When
this indicator is on, do not put
the computer into standby
mode or turn off the computer.

keyboard is enabled. To enable
or disable the keypad, press
and hold the Fn key while
pressing the NumLk key.

5 Caps lock Green: Caps Lock mode is enabled.

6 Scroll lock Green: Scroll Lock mode is enabled.

7 Power on Green: This indicator stays lighted

To enable or disable Caps
Lock mode, press Fn + Caps
Lock key.

Arrow keys can be used as
screen-scroll function keys, but
not to move the cursor. To
enable or disable Scroll Lock
mode, press Fn + ScrLk key.
Not all application programs
support this function.

whenever 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.

ThinkPad A21e 37

Product overview

FRU Tests

The following table shows the test for each FRU.

FRU Applicable test

System board 1. Diagnostics --> CPU/Coprocessor

Power Diagnostics --> Other Devices --> IBM AC

LCD unit 1. Diagnostics --> Video Adapter

Modem 1. Make sure the modem is set up correctly.

Audio 1. Interactive Tests --> Internal Speaker

Speaker 1. Interactive Tests --> Internal Speaker

PC Card slots Note: The upper slot does not function and this

Keyboard 1. Diagnostics --> Systemboard -->

TrackPoint or
pointing device

Hard-disk drive Diagnostics --> Fixed Disks

2. Diagnostics --> Systemboard

Adapter, IBM Battery 1 (IBM Battery 2)

2. Interactive Tests --> Video

2. Replace the modem jack and the modem
card in turn, and run the following test in
Diagnostics --> Communication:
a. Lucent Modem (M2) Loopback
b. Lucent Modem (M2) Dialtone/DTM
c. Intel Modem Register
d. Intel Modem Loopback/DTMF
e. Intel SP Modem Register
f. Intel SP Modem Loopback/DTMF
g. 3Com MiniPCI Modem Test
h. 3Com MiniPCI Dialtone Test

2. Interactive Tests --> Stereo Speaker

3. Diagnostics --> Other Devices --> Crystal

SoundFusion

2. Interactive Tests --> Stereo Speaker

test is available only for the bottom
slot.Diagnostics --> Systemboard -->

PCMCIA, PCMCIA External Loop

Keyboard

2. Interactive Tests --> Keyboard

If the TrackPoint does not work, check the
configuration in the ThinkPad Configuration
program. If the TrackPoint is disabled, select
Enable to enable it.

After you use the TrackPoint, the pointer may
drift on the screen for a short time. This drift
can occur when a slight, steady pressure is
applied to the TrackPoint pointer. This symptom
is not a hardware problem. If the pointer stops
after a short time, no service action is
necessary.

If enabling the TrackPoint does not correct the
problem, continue with the following:
v Interactive Tests --> Mouse

™

Test

(continued)

38 ThinkPad A21e

Product overview

FRU Applicable test

Diskette drive 1. Diagnostics --> Diskette Drives

CD-ROM or
DVD drive

Memory 1. If two DIMMs are installed, remove one of

Fan 1. Turn on the computer and check the air

2. Interactive Tests --> Diskette

1. Diagnostics --> Other Devices -->

CD-ROM/DVD

2. Interactive Tests --> CD-ROM/DVD Test

them and run Diagnostics --> Memory
Test - Quick.

2. If the problem does not recur, return the
DIMM to its place, remove the other one,
and run the test again.

3. If the test does not detect the error, run
Diagnostics --> Memory Test - Full.

turbulence at the louver near the power
switch.

2. Run Diagnostics --> Other Devices -->
IBM Fan.

ThinkPad A21e 39

Product overview

Fn key combinations

The following table shows the function of each combination
of Fn with a function key.

The Fn key works independently from the operating
system.

Key combination Description
Fn + F1 Reserved.
Fn + F2 Reserved.
Fn + F3 Turn off the LCD display, leaving the

Fn + F4 Turn standby mode on. To return to

Fn + F5 Reserved.
Fn + F6 Reserved.
Fn + F7 Switch between the LCD and an external

Fn + F8 Turn screen expansion on or off. (There is

Fn + F9 Reserved.
Fn + F10 Reserved.
Fn + F11 Reserved.
Fn + F12 Turn hibernation mode on.
Fn + PgUp Turn the ThinkLight on or off.
Fn + Home The LCD becomes brighter.
Fn + End The LCD becomes less bright.
Fn + Insert Audio volume becomes bigger.
Fn + Delete Audio volume becomes smaller.
Fn + Backspace Mute.

screen blank. To turn the LCD display on
again, press any key or the TrackPoint
stick.

normal operation, press the Fn key.

monitor.

no symbol on the key.)

40 ThinkPad A21e

Symptom-to-FRU index

Symptom-to-FRU index

The symptom-to-FRU index in this section lists symptoms
and errors and their possible causes. The most likely
cause is listed first, in boldface type.

Note: Do the FRU replacement or other actions in the

sequence shown in the column headed “FRU or
action, in sequence.” If replacing a FRU does not
solve the problem, put the original part back in the
computer. Do not replace a nondefective FRU.

This index can also help you determine, during regular
servicing, what FRUs are likely to need to be replaced
next.

A numeric error is displayed for each error detected in
POST or system operation. In the displays, n can be any
number.

If no numeric code is displayed, check the narrative
descriptions of symptoms. If the symptom is not described
there, go to “Intermittent problems” on page 46.

Note

For an IBM device not supported by diagnostic
codes in the ThinkPad notebook computers, see the
manual for that device.

Numeric error codes

Symptom or error FRU or action, in sequence
0175

Bad CRC1, stop POST task —
The EEPROM checksum is not
correct.

0187

EAIA data access error — The
access to EEPROM has failed.

0188

Invalid RFID serialization
information area or bad CRC2
— The EEPROM checksum is
not correct.

0189

Invalid RFID configuration
information area — The
EEPROM checksum is not
correct.

(continued)

System board.

System board.

System board.

System board.

ThinkPad A21e 41

Symptom-to-FRU index

Symptom or error FRU or action, in sequence
0190

Critical low battery error.

0200

Hard disk error — The hard
disk is not working.

021x

Stuck key — Keyboard error.

0220

Monitor type error — Monitor
type does not match the one
specified in CMOS.

0230

Shadow RAM error — The
shadow RAM failure at offset
nnnn.

0231

System RAM failure at offset
nnnn.

0232

Extended RAM error —
Extended RAM failure at offset
nnnn.

0250

System battery error — System
battery is dead.

0251

System CMOS checksum
bad—Default configuration
used.

0252

Password checksum bad —
The password is cleared.

0260

System timer error.

0270

Real-time clock error.

0271

Date and time error — Neither
the date nor the time is set in
the computer.

1. Charge the battery pack.

2. Battery pack.

1. Reseat the hard-disk
drive.

2. Load Setup Defaults in IBM
BIOS Setup Utility.

3. Hard-disk drive.

4. System board.

Run interactive tests of the
keyboard and the auxiliary
input device.

Load Setup Defaults in IBM
BIOS Setup Utility.

System board.

1. DIMM.

2. System board.

1. DIMM.

2. System board.

Replace the backup battery
and run IBM BIOS Setup
Utility to reset the time and
date.

Replace the backup battery
and run IBM BIOS Setup
Utility to reset the time and
date.

Reset the password by
running IBM BIOS Setup
Utility.

1. Replace the backup
battery and run IBM BIOS
Setup Utility to reset the
time and date.

2. System board.

1. Replace the backup

battery and run IBM BIOS
Setup Utility to reset the
time and date.

2. System board.

Run IBM BIOS Setup Utility to
reset the time and date.

(continued)

42 ThinkPad A21e

Symptom-to-FRU index

Symptom or error FRU or action, in sequence
0280

Previous boot incomplete —
Default configuration used.

02B2

Incorrect drive A type.

02F4

EISA CMOS not writable.

02F5

DIMM test failure.

02F6

Software NMI failure.

02F7

Fail-safe timer NMI failure.

1801

Attached docking station is not
supported.

1. Load Setup Defaults in
IBM BIOS Setup Utility.

2. DIMM.

3. System board.

1. Diskette drive.

2. External FDD cable.

3. I/O card.

1. Load Setup Defaults in
IBM BIOS Setup Utility.

2. Replace the backup battery.

3. System board.

1. DIMM.

2. System board.

1. DIMM.

2. System board.

1. DIMM.

2. System board.

Shut down the computer and
remove it from the docking
station

ThinkPad A21e 43

Symptom-to-FRU index

Error messages

Symptom or error FRU or action, in sequence

Device address conflict. 1. Load Setup Defaults in

Allocation error for device. 1. Load Setup Defaults in

Failing bits: nnnn. 1. DIMM.

Invalid system configuration
data.

I/O device IRQ conflict. 1. Load Setup Defaults in

Operating system not found. 1. Check that the operating

Hibernation error. 1. Restore the system

Fan error. Fan.
Unsupported memory

configuration.

IBM BIOS Setup Utility.

2. Backup battery.

3. System board.

IBM BIOS Setup Utility.

2. Backup battery.

3. System board.

2. System board.

1. DIMM.

2. System board.

IBM BIOS Setup Utility.

2. Backup battery.

3. System board.

system has no failure and is
installed correctly.

2. Enter IBM BIOS Setup

Utility and see whether
the hard-disk drive and
the diskette drive are
properly identified.

3. Reseat the hard-disk drive.

4. Reinstall the operating
system.

5. Diskette drive.

6. Hard-disk drive.

7. System board.

configuration to what it
was before the computer
entered hibernation mode.

2. If memory size has been
changed, re-create the
hibernation file.

Maximum memory size is 256
MB. Shut down the computer
and remove the extra
memory.

44 ThinkPad A21e

Symptom-to-FRU index

Beep symptoms

Symptom or error FRU or action, in sequence

One beep and a blank,
unreadable, or flashing LCD.

One long and two short beeps,
and a blank or unreadable
LCD.

Two short beeps with error
codes.

Two short beeps with blank
screen.

Three short beeps, pause,
three more short beeps, and
one short beep.

Only cursor appears. Reinstall operating system.

1. Reseat the LCD
connector.

2. LCD assembly.

3. External CRT.

4. System board.

1. System board.

2. LCD assembly.

3. DIMM.

POST error. See “Numeric
error codes” on page 41.

1. System board.

2. DIMM.

1. DIMM.

2. System board

No beep symptoms

Symptom or error FRU or action, in sequence

No beep, power-on indicator
on, LCD blank, and no POST.

No beep, power-on indicator
on, and LCD blank during
POST.

No beep during POST, but
system runs correctly.

The power-on password
prompt.

The hard-disk password
prompt.

The DOS full screen looks
smaller.

1. Make sure that every

connector is connected
tightly and correctly.

2. DIMM.

3. System board.

1. Reseat DIMM.

2. System board.

Speaker.

A power-on password or a
supervisor password is set.
Type the password and press
Enter.

A hard-disk password is set.
Type the password and press
Enter.

Start the ThinkPad
Configuration program and set
the Screen expansion
function.

ThinkPad A21e 45

Symptom-to-FRU index

LCD-related symptoms

Important

The TFT LCD for the notebook computer contains
many thin-film transistors (TFTs). A small number of
dots that are missing, discolored, or always lighted
is characteristic of TFT LCD technology, but
excessive pixel problems can cause viewing
concerns. The LCD should be replaced if the
number of missing, discolored, or lighted dots in any
background is:
v SVGA: 5 or more bright dots, 5 or more dark

dots, or a total of 9 or more bright and dark dots.

v XGA: 8 or more bright dots, 8 or more dark dots,

or a total of 9 or more bright and dark dots.

Note: Bright dots means pixel is always on (white

or color.) Dark dots means pixel is always off
(black color.)

Symptom or error FRU or action, in sequence

No beep, power-on indicator
on, and a blank LCD during
POST.

v LCD backlight not working.
v LCD too dark.
v LCD brightness cannot be

adjusted.

v LCD contrast cannot be

adjusted.

v LCD screen unreadable.
v Characters missing pixels.
v Screen abnormal.
v Wrong color displayed.

Horizontal or vertical lines
displayed on LCD.

System board.

1. Reseat the LCD
connectors.

2. LCD assembly.

3. System board.

1. See important note for

“LCD-related symptoms”.

2. Reseat all LCD connectors.

3. LCD assembly.

4. System board.

LCD assembly.

Intermittent problems

Intermittent system hang problems can be due to a variety
of causes that have nothing to do with a hardware defect,
such as cosmic radiation, electrostatic discharge, or
software errors. FRU replacement should be considered
only when a problem recurs.

When analyzing an intermittent problem, do the following:

1. Run the diagnostic test for the system board in loop
mode at least 10 times.

2. If no error is detected, do not replace any FRUs.

46 ThinkPad A21e

Symptom-to-FRU index

3. If any error is detected, replace the FRU shown by the
FRU code. Rerun the test to verify that no more errors
exist.

Undetermined problems

You are here because the diagnostic tests did not identify
which adapter or device failed, wrong devices are installed,
a short circuit is suspected, or the system is inoperative.
Follow these procedures to isolate the failing FRU (do not
isolate FRUs that have no defects).

Verify that all attached devices are supported by the
computer.

Verify that the power supply being used at the time of the
failure is operating correctly. (See “Power system
checkout” on page 29.)

1. Power off the computer.

2. Visually check each FRU for damage. Replace any
damaged FRU.

3. Remove or disconnect all of the following devices:
a. Non-IBM devices
b. Devices attached to the port replicator
c. Printer, mouse, and other external devices
d. Battery pack
e. Hard-disk drive
f. External diskette drive
g. DIMM
h. CD-ROM and diskette drive in the UltraslimBay
i. PC Cards

4. Power on the computer.

5. Determine whether the problem has changed.

6. If the problem does not recur, reconnect the removed
devices one at a time until you find the failing FRU.

7. If the problem remains, replace the following FRUs one
at a time (do not replace a nondefective FRU):
a. System board
b. LCD assembly

FRU replacement notices

This section contains notices related to removing and
replacing parts. Read this section carefully before replacing
any FRU.

Screw notices

Loose screws can cause a reliability problem. The an IBM
ThinkPad computer address this problem with special
nylon-coated screws that have the following characteristics:

v They maintain tight connections.
v They do not easily come loose, even with shock or

vibration.

ThinkPad A21e 47

FRU replacement notices

v They are harder to tighten.
v They should be used only once.

Do the following when you service this machine:
v Keep the screw kit (for reference the P/N, see

“Miscellaneous parts” on page 96) in your tool bag.

v Always use new screws.
v Use a torque screwdriver if you have one.

Tighten screws as follows:

v Plastic to plastic

Turn an additional 90 degrees after the screw head
touches the surface of the plastic part:

v Logic card to plastic

Turn an additional 180 degrees after the screw head
touches the surface of the logic card:

v Torque driver

If you have a torque driver, refer to the “Torque” column
for each step.

v Make sure you use the correct screw. If you have a

torque screwdriver, tighten all screws firmly to the torque
shown in the table. Never use a screw that you

removed. Use a new one. Make sure the screws are
tightened firmly.

Retaining serial numbers

This section includes the following descriptions:
v “Restoring the serial number of the system unit” on

page 49

v “Retaining the UUID” on page 49

48 ThinkPad A21e

FRU replacement notices

Restoring the serial number of the system unit

When the computer was manufactured, the EEPROM on
the system board was loaded with the serial numbers of
the system and all major components. These numbers
need to remain the same throughout the life of the
computer.

If you replace the system board, you must restore the
serial number of the system unit to its original value.

Before replacing the system board, save the original serial
number by doing the following:

1. Install the ThinkPad hardware maintenance diskette
version 1.61, and restart the computer.

2. From the main menu, select 1. Set System
Identification.

3. Select 2. Read S/N data from EEPROM.

The serial number for each device is displayed. Write
down the serial number of the system unit, designated as
follows:

20: System unit serial number

After you have replaced the system board, restore the
serial number by doing the following:

1. Install the ThinkPad hardware maintenance diskette
version 1.61 and restart the computer.

2. From the main menu, select 1. Set System
Identification.

3. Select 1. Add S/N data from EEPROM.
Follow the instructions on the screen.

Note: The serial number of the system unit is written on

the label attached on the bottom of the computer.

Retaining the UUID

The Universally Unique Identifier (UUID) is a 128-bit
number uniquely assigned to your computer at production
and stored in the EEPROM of your system board. The
algorithm that generates the number is designed to provide
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 1.61, 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.

ThinkPad A21e 49

Removing and replacing a FRU

Removing and replacing a FRU

This section presents information and drawings for use in
removing and replacing a FRU. Be sure to observe the
following general rules:

1. Do not try to service the computer unless you have
been trained and certified. An untrained person runs
the risk of damaging parts.

2. Before replacing any FRU, review “FRU replacement
notices” on page 47.

3. Begin by removing any FRUs that have to be removed
before the failing FRU. Any such FRUs are listed at the
top of the page. Remove them in the order in which
they are listed.

4. Follow the correct sequence in the steps for removing
the FRU, as indicated in the drawings by the numbers
in square callouts.

5. When turning a screw to replace a FRU, turn it in the
direction indicated by the arrow in the drawing.

6. When removing the FRU, move it in the direction
indicated by the arrow in the drawing.

7. To put the new FRU in place, reverse the removal
procedure and follow any notes that pertain to
replacement. For information about connecting and
arranging internal cables, see “Locations” on page 87.

8. When replacing a FRU, use the correct screw as
shown in the procedures.

CAUTION:
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.

CAUTION:
Do not disassemble the battery pack, throw it into fire
or water, or short-circuit it. Dispose of the battery pack
as required by local ordinances or regulations.

Attention: Before the computer is powered on after FRU

replacement, make sure all screws, springs, and other
small parts are in place and are not loose inside the
computer. Verify this by shaking the computer gently and
listening for rattling sounds. Metallic parts or metal flakes
can cause electrical short circuits.

Attention: The system board is sensitive to, and can be
damaged by, electrostatic discharge. Establish personal
grounding by touching a ground point with one hand before
touching these units.

You must use an electrostatic discharge (ESD) strap (P/N

6405959) to establish personal grounding.

50 ThinkPad A21e

Removing and replacing a FRU

1010 Battery pack

CAUTION:
If the rechargeable battery pack is incorrectly replaced,
there is danger of an explosion. The battery pack
contains a small amount of harmful substances. To
avoid possible injury: (1) replace only with a battery of
the type recommended by IBM, or an equivalent, (2)
keep the battery pack away from fire, (3) do not
expose it to water or rain, (4) do not attempt to
disassemble it, (5) do not short-circuit it. Do not put
the battery pack in trash that is disposed of in
landfills. When disposing of the battery, comply with
local ordinances or regulations.

ThinkPad A21e 51

Removing and replacing a FRU

1020 DIMM

v Battery pack (1010)

Note: Loosen the screw 1, but do not remove it.

When installing: With the notched end of the DIMM

toward the socket, insert the DIMM into
the socket, then press it firmly. Pivot the
DIMM until it snaps into place. Make
sure that the card is firmly fixed in the
slot and does not move easily.

52 ThinkPad A21e

Removing and replacing a FRU

1030 Mini PCI adapter

v Battery pack (1010)

Note: Loosen the screw 1, but do not remove it.

(continued)

1

2

ThinkPad A21e 53

Removing and replacing a FRU

Note: The illustration shows the combo card. Connector

(A) is for the LAN feature and (B) is for the modem

feature. This slot also supports a Mini PCI modem
card or Mini PCI network card. Step 5 depends
on the card type. Disconnect either (A), (B) or both.

When installing the card, do the following:
v With the notched end of the card toward the socket,

insert the card into the socket, then press it firmly. Pivot
the card until it snaps into place. Make sure that the
card is firmly fixed in the slot and does not move easily.

v Make sure that the connector (A) is placed under the

card when reinstalling the Mini PCI adapter.

54 ThinkPad A21e

Removing and replacing a FRU

1040 Backup battery

CAUTION:
There is a danger of an explosion if the backup battery
is incorrectly replaced. The lithium battery (IBM P/N
02K6572 UL-recognized component [file no. MH12210])
contains lithium and can explode if it is not properly
handled or disposed of. Replace only with a battery of
the same type. To avoid possible injury or death, do
not: (1) throw or immerse the battery into water, (2)
allow it to heat to more than 100°C (212°F), or (3)
attempt to repair or disassemble it. Dispose of it as
required by local ordinances or regulations.

v Battery pack (1010)
v DIMM (1020)
v Mini PCI adapter (1030)

ThinkPad A21e 55

Removing and replacing a FRU

1050 Hard-disk drive

Attention

Do not drop or apply any shock to the hard-disk
drive. The hard-disk drive is sensitive to physical

shock. Incorrect handling can cause damage and
permanent loss of data.

Before removing the drive, have the user make a
backup copy of all the information on the drive if
possible.

Never remove the drive while the system is
operating or is in suspend mode.

v Battery pack (1010)

Note: The hard disk is attached to the cover.

Step Screw (quantity)

1 Coin screw (1) or security screw (1)

Note: Use a 2.5-mm Allen wrench to remove the security screw.

56 ThinkPad A21e

Removing and replacing a FRU

When installing: Make sure that the HDD connector is

firmly connected.

ThinkPad A21e 57

Removing and replacing a FRU

1060 Ultrabay 2000 device

Any of several devices can be inserted into the Ultrabay

2000. The procedure for installing and removing is the

same for every device.
Note: When you release the switch in step 1 the lever

pops out. Pull the lever a little in step 2 to release
the device from the bay.

58 ThinkPad A21e

(continued)

Removing and replacing a FRU

ThinkPad A21e 59

1070 Keyboard

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)

Removing and replacing a FRU

11

Step Screw (quantity) Torque

1 M2.5 × 15 mm, nylon-coated (3) 39.2 Ncm

(continued)

(4 kgfcm)

60 ThinkPad A21e

Removing and replacing a FRU

(continued)

ThinkPad A21e 61

Removing and replacing a FRU

When installing: When installing the keyboard, do as

1. Install the new keyboard, following the directions in the
figure. Make sure that the keyboard edges, shown in
the figure as (A), (B), and (C), are under the frame.

2. Push the Y key 1 to connect the keyboard to the
connector on the underside of the key; then push the
frame of the keyboard 2 to latch the latches.

follows:

3. After the fastening of three screws of bottom side, push
the Y key again to connect the keyboard firmly to the
connector on the underside of the key.

62 ThinkPad A21e

Removing and replacing a FRU

1080 Keyboard CRU insulator

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)

ThinkPad A21e 63

Removing and replacing a FRU

1090 Hinge cover

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)
v Keyboard CRU insulator (1080)

Step Screw (quantity) Torque

1 M2.5 × 15 mm, nylon-coated (1) 39.2 Ncm

(4 kgfcm)

64 ThinkPad A21e

Removing and replacing a FRU

1100 Keyboard bezel and speaker

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)
v Keyboard CRU insulator (1080)
v Hinge cover (1090)

Step Screw (quantity) Torque

1 M2.5 × 4.8 mm, nylon-coated (7) 39.2 Ncm

(4 kgfcm)

(continued)

ThinkPad A21e 65

Removing and replacing a FRU

Step Screw (quantity) Torque

2 M2.5 × 15 mm, nylon-coated (2) 39.2 Ncm

(4 kgfcm)

Cable routing: When replacing the cable, see the

preceding figure for its cable routing.

66 ThinkPad A21e

Removing and replacing a FRU

1110 Speaker cable

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)
v Keyboard CRU insulator (1080)
v Hinge cover (1090)
v Keyboard bezel and speaker (1100)

When installing: Make sure that you fasten the connector

firmly.

ThinkPad A21e 67

Removing and replacing a FRU

1120 Sub card

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)
v Keyboard CRU insulator (1080)
v Hinge cover (1090)
v Keyboard bezel and speaker (1100)

Step Screw (quantity) Torque

1 Special, nylon-coated (2) —

(continued)

68 ThinkPad A21e

Removing and replacing a FRU

Step Screw (quantity) Torque

2 M2.5 × 4.8 mm, nylon-coated (1) 39.2 Ncm

(4 kgfcm)

ThinkPad A21e 69

Removing and replacing a FRU

1130 PC Card slot assembly

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)
v Keyboard CRU insulator (1080)
v Hinge cover (1090)
v Keyboard bezel and speaker (1100)
v Sub card (1120)

Step Screw (quantity) Torque

1 M2.0 × 9.5 mm, nylon-coated (2) 24.5 Ncm

(2.5 kgfcm)

70 ThinkPad A21e

Removing and replacing a FRU

1140 Fan assembly

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)
v Keyboard CRU insulator (1080)
v Hinge cover (1090)
v Keyboard bezel and speaker (1100)

Step Screw (quantity) Torque

1 M2.5 × 4.8 mm, nylon-coated (3) 39.2 Ncm

(4 kgfcm)

ThinkPad A21e 71

Removing and replacing a FRU

When installing: When installing the fan assembly, apply

the thermal grease (05K5751) on the
a-part of the fan as shown in the
following figure.

72 ThinkPad A21e

Removing and replacing a FRU

1150 Diskette drive

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)
v Keyboard CRU insulator (1080)
v Hinge cover (1090)
v Keyboard bezel and speaker (1100)
v Speaker cable (1110)

Note: Remove the diskette drive spacer 1 gently; it will

be reused when installing the new diskette drive.

Step Screw (quantity) Torque

2 M2.5 × 4.8 mm, nylon-coated (1) 39.2 Ncm

3 M2.5 × 15 mm, nylon-coated (2) 39.2 Ncm

(4 kgfcm)

(4 kgfcm)

When installing: Do not press the a-part of the diskette

drive to avoid the damage.

ThinkPad A21e 73

Removing and replacing a FRU

1160 Upper shield

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)
v Keyboard CRU insulator (1080)
v Hinge cover (1090)
v Keyboard bezel and speaker (1100)
v Speaker cable (1110)
v Sub card (1120)
v PC Card slot assembly (1130)
v Fan assembly (1140)
v Diskette drive (1150)

Step Screw (quantity) Torque

1 M2.5 × 15 mm, nylon-coated (2) 39.2 Ncm

2 M2.5 × 4.8 mm, nylon-coated (2) 39.2 Ncm

(4 kgfcm)

(4 kgfcm)

74 ThinkPad A21e

Removing and replacing a FRU

1170 System board

v Battery pack (1010)
v DIMM (1020)
v Mini PCI adapter (1030)
v Backup battery (1040)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)
v Keyboard CRU insulator (1080)
v Hinge cover (1090)
v Keyboard bezel and speaker (1100)
v Speaker cable (1110)
v Sub card (1120)
v PC Card slot assembly (1130)
v Fan assembly (1140)
v Diskette drive (1150)
v Upper shield (1160)

Step Screw (quantity) Torque

1 M2.5 × 15 mm, nylon-coated (3) 39.2 Ncm

(4 kgfcm)

(continued)

ThinkPad A21e 75

Removing and replacing a FRU

Step Screw (quantity) Torque

3 M2.5 × 4.8 mm, nylon-coated (2) 39.2 Ncm

(4 kgfcm)

76 ThinkPad A21e

Removing and replacing a FRU

2010 LCD assembly

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)
v Keyboard CRU insulator (1080)
v Hinge cover (1090)
v Keyboard bezel and speaker(1100)

Step Screw (quantity) Torque

1 M2.5 × 4.8 mm, nylon-coated (4) 39.2 Ncm

(4 kgfcm)

(continued)

ThinkPad A21e 77

Removing and replacing a FRU

Step Screw (quantity) Torque

2 Special, nylon-coated (2) —
4 M2.5 × 4.8 mm, nylon-coated (2) 39.2 Ncm

(4 kgfcm)

78 ThinkPad A21e

Removing and replacing a FRU

2020 Front bezel

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)
v Keyboard CRU insulator (1080)
v Hinge cover (1090)
v Keyboard bezel and speaker (1100)
v LCD assembly (2010)

Step Screw (quantity) Torque

1 M2.5 × 4.8 mm, nylon-coated (2) 39.2 Ncm

(4 kgfcm)

ThinkPad A21e 79

Removing and replacing a FRU

Note: Only the front bezel for the 15.0-in. XGA TFT (LG)

has a identifying mark (V), as in the following
figure. For reference FRU list, see “15.0-in. XGA
TFT (LG)” on page 94

80 ThinkPad A21e

Removing and replacing a FRU

2030 Inverter card

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)
v Keyboard CRU insulator (1080)
v Hinge cover (1090)
v Keyboard bezel and speaker (1100)
v Keyboard bezel (1130)
v LCD assembly (2010)
v Front bezel (2020)

12.1-in. panel

Step Screw (quantity) Torque

1 M2.5 × 4.8 mm, nylon-coated (1) 39.2 Ncm

(continued)

(4 kgfcm)

ThinkPad A21e 81

Removing and replacing a FRU

14.1-in. and 15.0-in. panels

Step Screw (quantity) Torque

1 M2.5 × 4.8 mm, nylon-coated (1) 39.2 Ncm

(4 kgfcm)

82 ThinkPad A21e

Removing and replacing a FRU

2040 LCD panel

v Battery pack (1010)
v Hard-disk drive (1050)
v Ultrabay 2000 device (1060)
v Keyboard (1070)
v Keyboard CRU insulator (1080)
v Hinge cover (1090)
v Keyboard bezel and speaker (1100)
v LCD assembly (2010)
v Front bezel (2020)
v Inverter card (2030)

12.1-in. panel

Step MT Screw (quantity) Torque

1 2628-Cxx M2.5 × 7.0 mm,

nylon-coated (4)

39.2 Ncm
(4 kgfcm)

(continued)

ThinkPad A21e 83

(continued)

Removing and replacing a FRU

84 ThinkPad A21e

Removing and replacing a FRU

14.1-in. and 15.0-in. panels

Step MT Screw (quantity) Torque

1 2628-Jxx M2.0 × 5.7 mm,

nylon-coated (4)

(continued)

24.5 Ncm
(2.5 kgfcm)

ThinkPad A21e 85

Removing and replacing a FRU

Note: For 14.1-in. LCD, the LCD cable is taped onto the

connector. Tear off the tape before disconnecting
the LCD cable in step 3.

86 ThinkPad A21e

Locations

Locations
Front view

1 System status indicators
2 Battery and standby mode status indicators
3 Built-in stereo speakers
4 PC Card eject button
5 PC Card slot
6 Bay latch
7 Eject button
8 Ultrabay 2000 device

Note: The Ultrabay 2000 accepts storage

devices, such as a DVD drive, CD-ROM
drive, CD-RW, ZIP250, 2nd HDD or 2nd

9 TrackPoint pointing stick
10 TrackPoint buttons
11 ThinkPad button
12 Volume and mute buttons
13 Power switch

11 and 12 are Ez buttons for MT2632.

battery.

ThinkPad A21e 87

Rear view

1 Security keyhole
2 Parallel connector
3 Modem connector
4 Network connector
5 Serial connector
6 External-monitor connector
7 Universal serial bus (USB) connector
8 External-input-device connector
9 Power jack

Locations

88 ThinkPad A21e

Bottom view

1 Battery pack
2 Battery pack latches
3 Mini PCI card slot
4 Docking connector
5 DIMM slot
6 Stereo headphone jack
7 Stereo line-in jack
8 Diskette drive
9 Microphone jack
10 Hard-disk drive
11 LCD latches

Locations

ThinkPad A21e 89

Parts list

Parts list

90 ThinkPad A21e

The parts marked with asterisk are CRU (customer
replacable unit).

No. FRU P/N

1 LCD unit (see “LCD FRU” on page 93)
2 Hinge cover

for MT2628-Jxx, -Ixx 04P3970
for MT2628-Cxx 04P3972
for MT2632 (i-series) 04P3725

3 Speaker assembly

for MT2628-Jxx 02K5644
for MT2628-Cxx and MT2632 (i-series) 02K5007

4 Keyboard bezel

for MT2628-Jxx 04P3727

for Korea 08K7091

for MT2628-Cxx 04P3726

for Korea 08K7090

for MT2632 (i-series) 04P3728
5 Sub card 08K3306
6 PC card slot 04P3398
7 Fan assembly 04P3482
a Stiffener, CPU socket
8 Backup battery 02K6572
9 Mini PCI combo card (Intel)* 08K3125

Mini PCI combo card CR* 19K5888
Mini PCI combo card (3Com)* 22P6444
Mini PCI modem card (IBM CR)* 08K3338
Mini PCI modem card (Ambit)* 08K3252
Mini PCI Ethernet card (Intel)* 08K3348
for optional Mini PCI adapter, see “Optional FRUs” on

page 98
10 Blank cap RJ45* 04P3975
11 Base cover 04P3712

for T-China 04P3716
for Korea 04P3720
for MT2632 (i-series) 04P3723

12 Ultrabay 2000 CD-ROM drive (LG)* 08K9579

Ultrabay 2000 CD-ROM drive drive (TEAC)* 27L3436

for optional Ultrabay 2000 device, see “Optional FRUs” on

page 98

Parts list

(continued)

ThinkPad A21e 91

Parts list

No. FRU P/N

b Card modem connector (see “Miscellaneous parts” on

page 96)
13 Cover, Mini PCI adapter slot* 08K5673
14 Battery pack (6 cell), SANYO* 02K6618

Battery pack (6 cell), Panasonic* 02K6614

Battery pack (7 cell) NiMH, Panasonic* 02K6720

Battery pack (9 cell), SANYO* 02K6619

Battery pack (9 cell), Panasonic* 02K6615

for optional battery pack, see “Optional FRUs” on page 98
15 Cover, DIMM slot* 08K5674
16 Hard-disk drive (10.0 GB), SSD* 08K9508

Hard-disk drive (10.0 GB), Hitachi* 08K9531

Hard-disk drive (20.0 GB), SSD* 27L3427

Hard-disk drive (20.0 GB), Hitachi* 08K9533

for optional hard-disk drive, see “Optional FRUs” on

page 98
17 Cover, hard-disk drive*

for MT2628-Jxx 08K5676

for MT2628-Cxx and MT2632 (i-series) 08K5675
18 System board 08K3262
19 64-MB SDRAM SO DIMM* 20L0264

128-MB SDRAM SO DIMM* 20L0265

for optional DIMM, see “Optional FRUs” on page 98
20 Upper shield 08K7158
21 Diskette drive (TEAC) 05K9157

Diskette drive (SONY) 08K9552
22 Spacer, diskette drive 04P3225
23 Speaker cable 27L0601
24 Keyboard* (see “Keyboard” on page 95)
25 Pointing stick cap* 84G6536

- Telephone cable* 05K2707

- Video cable* 27L0531

- AC adapter (72W), 3-pin (ASTEC)* 02K6666
AC adapter (72W), 3-pin (DELTA)* 02K6670
AC adapter (72W), 2-pin (ASTEC)* 02K6669
AC adapter (72W), 2-pin (SANKEN)* 02K6677
AC adapter (72W), 2-pin (DELTA)* 02K6673
for optional AC adapter, see “Optional FRUs” on page 98

92 ThinkPad A21e

Parts list

LCD FRU

12.1-in. SVGA TFT

FRU P/N

LCD cover assembly 08K5655

for Korea 08K5659
LCD cable 27L0485
LCD panel (SANYO) 05K9577
Hinges 08K5664
Inverter card 08K3325

14.1-in. XGA TFT

FRU P/N

LCD cover assembly

for MT2628-Ixx 08K5656

for MT2632 (i-series) 04P3724
LCD cable

for MT2628-Ixx 27L0486

for MT2632 (i-series) 27L0610
LCD panel (DBU) 05K9578
LCD panel (SAMSUNG) 05K9588
Hinges 08K5665
Inverter card 12P3051

15.0-in. XGA TFT

FRU P/N

LCD cover assembly 08K5657

for Korea 08K6443
LCD cable 27L0487
LCD panel (SAMSUNG) 05K9580
Hinges 04P3488
Inverter card 08K3326

(continued)

ThinkPad A21e 93

Parts list

15.0-in. XGA TFT (LG)

FRU P/N

LCD cover assembly 04P3048

for Korea 04P3049
LCD cable 27L0578
LCD panel (LG) 05K9647
Hinges 04P3488
Inverter card 08K3326
Misc kit (see “Miscellaneous parts” on page 96.) 04P3050

94 ThinkPad A21e

Parts list

Keyboard

Language P/N

Arabic 02K5476
Belgian 02K5470
Canadian French 02K5456
Chinese, traditional 02K5459
Czech 02K5480
Danish 02K5467
Dutch 02K5464
European Spanish 02K5469
European French 02K5463
German 02K5462
Greek 02K5473
Hungarian 02K5479
Hebrew 02K5474
Italian 02K5468
Japanese 02K5458
Korean 02K5460
Latin American Spanish 02K5457
Norwegian 02K5466
Polish 02K5481
Portuguese 02K5472
Russian 02K5477
Slovakian 02K5478
Slovenian 02K5482
Swedish or Finnish 02K5465
Swiss 02K5471
Turkish 02K5475
U.K. English 02K5461
U.S. English 02K5455
Japanese (i-series) 02K5576

ThinkPad A21e 95

Miscellaneous parts

FRU P/N

Screw kit (including nylon-coated screws):

v M2 x 3.6 mm, flat head (3)
v M2 x 5.1 mm, flat head (5)
v M2 x 5.7 mm, flat head (5)
v M2 x 16 mm, bind head (3)
v M2.5 x 4.8 mm, flat head (42)
v M2.5 x 5.5 mm, flat head (2)
v M2.5 x 15 mm, flat head (15)
v M2.6 x 2.8 mm, bind head (7)
v M3 x 2.8 mm, small head (5)
v Coin screw (1)
v Security screw (1)
v Screw caps (14)

Base miscellaneous parts:

v Lens, IR
v Lens, Ultrabay 2000 LES
v Lock, battery
v Spring, battery lock
v Lid, docking FR
v Lid, docking RR
v Spring, lid docking
v Rubber foot
v Sponge
v Sponge, shield lower
v Sponge, small
v Blank cap, battery
v Screw caps
v Cu tape

System miscellaneous parts:

v Door, PC card slots
v Door, PC card 1 slot
v Spring, PC card slots
v Lens, LED hinge
v Blank cap, TV connector
v Eject knob, Ultrabay 2000
v Lock lever, Ultrabay 2000
v Spring, Ultrabay 2000
v Insulator, hard-disk drive
v Insulator, keyboard CRU
v Mini PCI guide
v Screw caps

Miscellaneous parts, for system board:

v I/O bracket (right/left)
v Guide, keyboard connector
v Hex stud
v (b) Card modem connector
v Flat head screw (M2.5 x 4.8)
v Screw caps

Parts list

04P3973

08K5647

04P3966

08K5648

(continued)

96 ThinkPad A21e