Laptop L40SX
Laptop CL57
Notebook N45SL
Notebook N51XX
Portable P70/P75
ThinkPad 300
ThinkPad 350
ThinkPad 500
ThinkPad 510
ThinkPad 710T
Expansion Unit
Dock Station I
Dock Station II
Before using this information and the product it
supports, be sure to read the general information
under “Notices” on page 489.
Second Edition (May 1995)
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 WARRANTY OF ANY
KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT
NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. Some states do not allow disclaimer of
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 and/or changes in the product(s) and/or the
program(s) described in this publication at any time.
It is possible that this publication may contain reference 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 reseller or IBM
marketing representative.
Copyright International Business Machines
Corporation 1995. 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.
iiIBM Mobile Systems HMM - Volume 1
About This Manual
This manual contains service and reference information for
IBM* Laptop, Notebook, Portable, and ThinkPad Computer
products. Use this manual along with the advanced
diagnostic tests to troubleshoot problems effectively.
The manual is divided into sections as follows:
The Introduction section provides general information,
guidelines, and safety information required to service
computers.
The majority of the manual consists of
product-specific sections that include service,
reference, and product-specific parts information.
The Common Devices Checkout section contains
information for testing optional attachable devices
common to the products in this manual.
The Common Parts Listing section contains parts
listings for parts and tools common to the products in
this manual.
The Miscellaneous section contains acronyms,
abbreviations, terms, and a telephone number listing.
Important
This manual is intended for trained servicers who are
familiar with IBM mobile products. Use this manual
along with the advanced diagnostic tests to
troubleshoot problems effectively.
Before servicing an IBM mobile product, be sure to
review the safety information under “Safety Notices
(Multi-lingual Translations)” on page 7 and “Safety
Information” on page 14.
*
Trademark of the IBM Corporation.
iii
Related Publications
The following publications are available for IBM mobile
products. For more information, contact IBM or your IBM
Authorized Dealer.
PublicationPart, Form Number
Mobile Systems HMM Volume 2:
Thinkpad Computers
Model L40 SX (8543) HMR15F2267, S15F2267
Model L40 SX (8543) HMS15F2266, S15F2266
Model N45SL (2614) HMR42G0485, S42G0485
Model N45SL (2614) HMS42G0486, S42G0486
Model N51 SX/SLC (8551) HMR04G5111, S04G5111
Model N51 SX/SLC (8551) HMS04G5112, S04G5112
Model CL57 SX (8554) HMR10G4419, S10G4419
Model CL57 SX (8554) HMS10G4420, S10G4420
Model P70 386 (8573) HMR64F3994, S64F3994
Model P70 386 (8573) HMS15F2198, S15F2198
Model P75 486 (8573) HMR84F8525, S84F8525
Model P75 486 (8573) HMS84F7593, S84F7593
ThinkPad 350/350C (2618),
PS/Note 425/425C HMS
Expansion Unit (3550-001) HMR42G2335, S42G2335
Expansion Unit (3550-001) HMS42G2336, S42G2336
Expansion Unit (3550-002) HMR42G2331, S42G2331
Expansion Unit (3550-002) HMS42G2332, S42G2332
PS/2 FaxConcentrator/A HMR
Supplement
PS/2 FaxConcentrator/A HMS
Supplement
PS/2 Comm. Cartridge I HMR10G5992, S10G5992
PS/2 Comm. Cartridge I HMS10G5993, S10G5993
PS/2 Comm. Cartridge II HML
(N51SX)
PS/2 Comm. Cartridge II HML
(CL57SX)
PS/2 Data/Fax Modem HML04G5110, S04G5110
IBM High Speed Internal,
PCMCIA Data/Fax Modems
30H2357,
S82G-1502-03
A211000, GA211000
15F2662, S15F2662
84F8541, S84F8541
04G5109, S04G5109
10G4421, S10G4421
61G1556, S61G1556
ivIBM Mobile Systems HMM - Volume 1
Obsolete Publications
This manual obsoletes the following publication:
PublicationPart, Form Number
IBM Laptop, Notebook, and
Portable Computers Vol. 1
82G1501, S82G1501
Related Diskettes
The following diskettes are available for IBM mobile
products. For more information, contact IBM or your IBM
Authorized Dealer.
DiskettePart, Form Number
Model L40 SX (8543)
Reference Diskette
Model N45SL (2614)
Advanced Diagnostics
Model N51 SX/SLC (8551)
Reference and Diagnostic
Package
All models in the following table have VGA video. Models
N51, CL57, P70/75, and Thinkpads 700x and 720x are
Micro Channel* systems. All others are AT* bus systems.
ModelTypeProcessorMemory Hrd Dsk
Model L40SX8543-044 386SX-20 2M/18M 60M
Model N45 SL2614-065 386SL-25 2M/8M 80M
Model N51 SLC8551-025 386SLC-16 2M/10M 80M
Model N51 SX8551-033 386SX-16 2M/10M 40M
Model CL57 SX8554-045 386SX-20 2M/16M 80M
Model P70 3868573-031 80386-16 2M/8M 30M
Diskette fixes are customer installable. The diskette
fixes are located on the PC Company Bulletin Board
Service (BBS). The direct phone line for modem
connection is 919-557-0001 or tieline 255-0001.
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 down-load information.
The Canadian BBS phone numbers are:
Montreal 514-938-3022
Toronto 905-316-4255
Vancouver 604-664-6464
Winnipeg 204-934-2735
FRU Replacement Strategy
Before Replacing Parts
Ensure that all diskette fixes are installed prior to
replacing any FRUs listed in this manual.
Use the following strategy to prevent unnecessary FRU
replacement and service expense:
If you are instructed to replace a FRU and that does
not correct the problem, reinstall the original FRU
before you continue.
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 the first
board that you replaced does not correct the problem,
reinstall the original board, then replace the other
(processor or system) board.
If an adapter or device consists of more than one
FRU, an error code might be caused by any of the
FRUs. 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.
Warning: A customized setup configuration (other than
default settings) might exist on the computer you are
servicing. Running Automatic Configuration might alter
those settings. Note the current configuration settings
(using the View Configuration option) and verify that the
settings are in place when service is complete.
4IBM Mobile Systems HMM - Volume 1
The advanced diagnostic tests are intended to test
only
IBM products. Non-IBM products or modified options can
give false errors and invalid responses.
Hard Disk Drive Replacement Strategy
Always try to run a low-level format before replacing a hard
disk drive.
Warning: The drive startup sequence in the computer
you are servicing might have been changed. Be extremely
careful during write operations such as copying, saving, or
formatting. Data or programs can be overwritten if you
select an incorrect drive.
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. The cause of the
first error code can result in false error codes being
displayed. 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.
How to Read POST Error Messages
POST error messages are displayed on the screen as
three, four, five, or eight digits. The error messages that
can be displayed as shorter POST messages are
highlighted in this index. Some digits will represent
different information for SCSI errors versus non-SCSI
errors.
The following example shows which digits display the
shorter POST error messages and also defines the SCSI
information in an eight-digit error message.
All SCSI devices are set to a different SCSI ID.
Duplicate SCSI ID settings can generate a false error
message. Use the SCSI ID to determine whether the error
message is coming from an internal or an external device.
Device Code │ Logical Unit Number (SCSI)
Introduction
5
Drive and Diskette Compatibility Matrix
The following table provides identification information for
diskettes and diskette drives.
Diskette
Drive
3.5-Inch - 1.44MB1.44 on the eject button
3.5-Inch - 2.88MB2.88 on the eject button
Identifying
Mark
The following table provides compatibility information for
3.5-inch diskettes and 3.5-inch diskette drives.
Diskette
Capacity
1.0MBRead/WriteRead/Write
2.0MBRead/WriteRead/Write
4.0MBNot CompatibleRead/Write
1.44MB
Drive
2.88MB
Drive
The following table provides identification information for
5.25-inch diskette drives.
Diskette
Drive
5.25-Inch - 360KB (External)Asterisk on bezel
5.25-Inch - 1.2MB (Internal)1.2 on the eject button
Identifying
Mark
The following table provides compatibility information for
5.25-inch diskettes and 5.25-inch diskette drives.
Diskette
Capacity
360KBRead/WriteRead/Write
1.2MBNot CompatibleRead/Write
360KB
Drive
1.2MB
Drive
Note: A 360KB diskette written to or formatted on a
1.2MB drive can be read reliably only on a 1.2MB
drive.
6IBM Mobile Systems HMM - Volume 1
Safety Notices (Multi-lingual
Translations)
In this manual, safety notices appear in English with a
page number reference to the appropriate multi-lingual,
translated safety notice found in this section.
The following safety notices are provided in English,
French, German, Italian, and Spanish languages.
Safety Notice 1
Before the computer is powered-on after FRU
replacement, make sure all screws, springs, or 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 apres
remplacement d'une unite en clientele, verifiez que
tous les ressorts, vis et autres pieces sont bien en
place et bien fixes. Pour ce faire, secouez l'unite et
assurez-vous qu'aucun bruit suspect ne se produit.
Des pieces metalliques ou des copeaux de metal
pourraient causer un court-circuit.
Bevor nach einem FRU-Austausch der Computer
wieder angeschlossen wird, muB sichergestellt
werden, daB keine Schrauben, Federn oder andere
Kleinteile fehlen oder im Gehause vergessen wurden.
Der Computer muß geschuttelt und auf
Klappergerausche gepruft werden. Metallteile
oder-splitter konnen Kurzschlusse erzeugen.
Prima di accendere l'elaboratore dopo che 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 ciò
scuotendo l'elaboratore e prestando attenzione ad
eventuali rumori; eventuali parti o pezzetti metallici
possono provocare scosse elettriche.
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.
Compruebelo agitando el sistema y escuchando los
posibles ruidos que provocarían. Las piezas metálicas
pueden causar cortocircuitos electricos.
Introduction 7
Safety Notice 2
Some standby batteries contain a small amount of
nickel and cadmium. Do not disassemble it, 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 when replacing the RTC or backup
battery. 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 demontez 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 reglementation en vigueur.
Lorsque vous remplacez la pile de sauvegarde ou
celle de l'horloge temps reel, veillez à n'utiliser que les
modèles cites dans la liste de pieces detachees
adequate. Une batterie ou une pile inappropriee
risque de prendre feu ou d'exploser.
Einige Hilfsbatterien enthalten geringe Mengen Nickel
und Cadmium. Sie durfen nicht zerlegt,
wiederaufgeladen, Feuer oder Wasser ausgesetzt,
oder kurzgeschlossen werden. Die Batterien mussen
vorschriftsmaBig entsorgt werden. Beim Ersetzen von
RTC oder der Sicherungsbatterie nur Batterien des
Typs verwenden, der in der Ersatzteilliste aufgefuhrt
ist. Der Einsatz falscher Batterien kann zu
Entzundung oder Explosion fuhren.
Alcune batterie di riserva contengono una piccola
quantità di nichel e cadmio. Non smontarle, ricaricarle,
gettarle nel fuoco o nell'acqua n 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 niquel y cadmio. No las desmonte, ni
recargue, ni las eche al fuego o al agua ni las
cortocircuite. Desechelas tal como dispone la
normativa local. Utilice sólo baterías que se
encuentren en la lista de piezas para sustituir la
batería de reserva o RTC. La utilización de una
batería no apropiada puede provocar la ignición o
explosión de la misma.
8IBM Mobile Systems HMM - Volume 1
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 demontez 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 reglementation en vigueur. Lorsque vous
remplacez la batterie, veillez à n'utiliser que les
modeles cites dans la liste de pieces detachees
adequate. En effet, une batterie inappropriee risque
de prendre feu ou d'exploser.
Auch Akkus enthalten geringe Mengen von Nickel.
Sie durfen nicht zerlegt, wiederaufgeladen, Feuer oder
Wasser ausgesetzt, oder kurzgeschlossen werden.
Die Batterien mussen vorschriftsmaBig entsorgt
werden. Beim Ersetzen von RTC oder der
Sicherungsbatterie nur Batterien des Typs verwenden,
der in der Ersatzteilliste aufgefuhrt ist. Der Einsatz
falscher Batterien kann zu Entzundung oder Explosion
fuhren.
La batteria contiene piccole quantità di nichel. Non
smontarla, gettarla nel fuoco o nell'acqua nè
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
niquel. No las desmonte, ni recargue, ni las eche al
fuego o al agua ni las cortocircuite. Desechelas 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 batería no apropiada
puede provocar la ignición o explosión de la misma.
Introduction 9
Safety Notice 4
The lithium battery can cause a fire, explosion, or
severe burn. Do not recharge it, remove its polarized
connector, disassemble it, heat it above 100 degrees
C (212 degrees F), incinerate it, or expose its cell
contents to water. Dispose of the battery as required
by local ordinances or regulations. Use of an incorrect
battery can result in ignition or explosion of the
battery. Replacement batteries can be ordered from
IBM or IBM Authorized Dealers.
La pile de sauvegarde contient du lithium. Elle
presente des risques d'incendie, d'explosion ou de
brûlures graves. Ne la rechargez pas, ne retirez pas
son connecteur polarise et ne la demontez pas. Ne
l'exposez pas à une temperature superieure à 100ØC,
ne la faites pas brûler et n'en exposez pas le contenu
à l'eau. Mettez la pile au rebut conformement à la
reglementation en vigueur. Une pile inappropriee
risque de prendre feu ou d'exploser. Les piles de
rechange peuvent etre obtenues aupres d'IBM ou d'un
distributeur agree IBM.
Die Sicherungsbatterie ist eine Lithiumbatterie. Sie
kann sich entzunden, explodieren oder schwere
Verbrennungen hervorrufen. Batterien dieses Typs
durfen nicht aufgeladen, zerlegt, uber 100 C erhitzt,
verbrannt, deren Polkappen abgenommen oder deren
Inhalt mit Wasser in Verbindung gebracht werden. Die
Batterien mussen vorschriftsmaBig entsorgt werden.
Der Einsatz falscher Batterien kann zu Entzundung
oder Explosion fuhren. Austauschbatterien können bei
IBM oder IBM Vertragspartnern bestellt werden.
La batteria di supporto e una batteria al litio e puo
incendiarsi, esplodere o procurare gravi ustioni.
Evitare di ricaricarla, smontarne il connettore
polarizzato, smontarla, riscaldarla ad una temperatura
superiore ai 100 gradi centigradi, incendiarla o gettarla
in acqua. Smaltirla secondo la normativa in vigore
(DPR 915/82, successive disposizioni e disposizioni
locali). L'impiego di una batteria non adatta potrebbe
determinare l'incendio o l'esplosione della batteria
stessa. Le batterie possono essere ordinate ai
rivenditori autorizzati IBM o all'IBM.
La bateria de repuesto es una bateria 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 100oC (212oF), ni la incinere ni exponga el
contenido de sus celdas al agua. Desechela tal como
dispone la normativa local.
10IBM Mobile Systems HMM - Volume 1
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 medecin si
des symptomes persistent apres le lavage.
Wenn die LCD-Anzeige zerbrechen sollte und die
darin enthaltene Flussigkeit mit Augen oder Handen in
Beruhrung kommt, sofort mindestens 15 Minuten lang
die betroffenen Korperstellen mit Wasser abwaschen.
Sollten danach noch durch die LCD-Flussigkeit
hervorgerufene Symptome auftreten sollte ein Arzt
aufgesucht werden.
In 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 minimo. Obtenga atención medica
si se presenta algún sintoma del fluido despues de
lavarse.
Safety Notice 6
To avoid shock, do not remove the plastic cover that
surrounds the lower portion of the inverter card.
Afin d'viter tout risque de choc lectrique, ne retirez pas
le cache en plastique prot geant la partie inf rieure de
la carte d'alimentation.
Aus Sicherheitsgr nden 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 pl stico
que rodea la parte baja de la tarjeta invertida.
Introduction 11
Safety Notice 7
Though main batteries have low voltage, a shorted or
grounded battery can produce enough current to burn
combustible materials or personnel.
Bien que le voltage des batteries principales soit peu
eleve, le court-circuit ou la mise à la masse d'une
batterie peut produire suffisamment de courant pour
brûler des materiaux combustibles ou causer des
brûlures corporelles graves.
Obwohl Hauptbatterien eine niedrige Spannung
haben, konnen sie doch bei KurzschluB oder Erdung
genug Strom erzeugen, um brennbare Materialien zu
entzunden 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 mate- rial combustible o provocar quemaduras
en el personal.
12IBM Mobile Systems HMM - Volume 1
Safety Notice 8
Before removing any FRU, power-off the computer,
unplug all power cords from electrical outlets, remove
the battery pack, then disconnect any interconnecting
cables.
Avant de retirer une unite remplacable en clientele,
mettez le systeme hors tension, debranchez tous les
cordons d'alimentation des socles de prise de courant,
retirez la batterie et deconnectez tous les cordons
d'interface.
Die Stromzufuhr muB 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
electrica, quite la batería y, a continuación,
desconecte cualquier cable de conexión entre
dispositivos.
Introduction 13
Safety Information
The following section contains the safety information that
you need to be familiar with before servicing an IBM
mobile computer.
General Safety
Follow these rules to ensure general safety:
Observe good housekeeping in the area of the
machines during and after maintenance.
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.
objects that weigh more than 16 kg (35 lb) or
objects that you think are too heavy for you.
Do not perform any action that causes hazards to the
customer, or that makes the equipment unsafe.
Before you start the machine, ensure that other
service representatives and the customer's personnel
are not in a hazardous position.
Place removed covers and other parts in a safe
place, away from all personnel, while you are
servicing the machine.
Keep your tool case away from walk areas so that
other people will not trip over it.
Do not wear loose clothing that can be trapped in the
moving parts of a machine. Ensure that your sleeves
are fastened or rolled up above your elbows. If your
hair is long, fasten it.
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.
Do not wear jewelry, chains, metal-frame eyeglasses,
or metal fasteners for your clothing.
Remember: A metal object is a conductor of
After service, reinstall all safety shields, guards,
labels, and ground wires. Replace any safety device
that is worn or defective.
Reinstall all covers correctly before returning the
machine to the customer.
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.
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.
Do not work alone under hazardous conditions or
near equipment that has hazardous voltages.
Disconnect all power before:
– Performing a mechanical inspection
– Working near power supplies
– Removing or installing main units
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.
If you need to work on a machine that has
electrical circuits, observe the following precautions:
– Ensure that another person, familiar with the
power-off controls, is near you.
Remember: 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.
Remember: There must be a complete circuit to
cause electrical shock. By observing the above
rule, you might 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.
exposed
Introduction
15
– 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 safety sections of maintenance information. Use
extreme care when measuring high voltages.
Regularly inspect and maintain your electrical hand
tools for safe operational condition.
Do not use worn or broken tools and testers.
Never assume
from a circuit. First,
powered-off.
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.
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.
Do not service the following parts
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.)
If an electrical accident occurs:
– Use caution; do not become a victim
yourself.
– Switch off power.
– Send another person to get medical aid.
that power has been disconnected
check
that it has been
with the power on
Safety Inspection Guide
The intent of this inspection guide is to assist you in
identifying potentially unsafe conditions on these products.
Each machine, as it was designed and built, had required
safety items installed to protect users and service
personnel from injury. This guide addresses only those
items. However, good judgment should be used 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:
16IBM Mobile Systems HMM - Volume 1
Electrical hazards, especially primary power (primary
voltage on the frame can cause serious or fatal
electrical shock).
Explosive hazards, such as a damaged CRT face or
bulging capacitor
Mechanical hazards, such as loose or missing
hardware
The guide consists of a series of steps presented in a
checklist. Begin the checks with the power off, and the
power cord disconnected.
Checklist:
1. Check exterior covers for damage (loose, broken, or
sharp edges).
2. Power-off the computer. Disconnect the power cord.
3. Check the power cord for:
a. A third-wire ground connector in good condition.
Use a meter to measure third-wire ground
continuity for 0.1 ohm or less between the
external ground pin and frame ground.
b. The power cord should be the appropriate type
as specified in the parts listings.
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.
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:
Keep the parts in protective packages until they are
inserted into the product.
Avoid contact with other people.
Wear a grounded wrist strap against your skin to
eliminate static on your body.
Prevent the part from touching your clothing. Most
clothing is insulative and retains a charge even when
you are wearing a wrist strap.
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.
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 computer. You can use coax or
connector-outside shells on these computers.
– Use the round ground-prong of the AC plug on
AC-operated computers.
Grounding Requirements
Electrical grounding of the PS/2 computer is required for
operator safety and correct computer function. Proper
grounding of the electrical outlet can be verified by a
certified electrician.
18IBM Mobile Systems HMM - Volume 1
Screw Size Chart
Use the chart below to match the size and shape of the
screws used in the computer you are servicing.
A
B
C
D
E
F
G
H
J
K
L
M
N
Silver
Black
Silver
Brass
Black
Black
Black
Brass
Silver
Brass
Silver
Silver
Silver
P
Q
Introduction 19
Black
Brass
Screw Size Chart (continued):
to match the size and shape of the screws used in the
computer you are servicing.
Use the chart below
R
S
T
U
V
W
X
Y
Z
AA
BB
CC
DD
Brass
Black
Brass
Black
Brass
Black
Black
Brass
Brass
Black
Brass
Brass
Black
EE
FF
Black
Silver
20IBM Mobile Systems HMM - Volume 1
Screw Size Chart (continued):
to match the size and shape of the screws used in the
computer you are servicing.
– Power-off the computer and all external devices.
– Insert the backup copy of the Advanced Diagnostics
diskette into the diskette drive.
– Power-on the computer and check for the following
responses:
1. All icons on the system-status display appear once
for about 1 second.
Note: Some icons remain on after 1 second.
2. Memory counts.
3. One or two short beeps
4. The Speaker icon starts blinking and continues
blinking until any key is pressed.
5. The IBM Logo is displayed on the screen.
DID YOU RECEIVE THE CORRECT RESPONSES?
Yes No
004
Go to “Symptom-to-FRU Index” on page 32.
005
– Advance to the Main Menu.
– Press Ctrl+A, then type 0 to run the tests.
DID YOU RECEIVE AN ERROR MESSAGE OR ERROR
CODE?
Yes No
006
The diagnostic tests have completed without
detecting an error.
007
Go to “Symptom-to-FRU Index” on page 32.
24IBM Mobile Systems HMM - Volume 1
Memory Checkout
Notes:
1. Power-off the computer before removing or replacing
any parts.
2. Run AUTOMATIC CONFIGURATION after removing
or replacing memory modules. (If you have to run
configuration with your own diskette, be sure the
customer has all the correct option diskettes
available.)
3. Disregard 164 Memory-Size Errors.
(Model L40 does not work with the combination of two
4MB memory modules installed.)
001
– Remove the memory module kits in connectors 1 and 2
if installed. Note which memory module kit is in
connector 1.
– Run the memory tests.
Use the RUN TESTS ONE TIME option.
DID THE MEMORY TESTS END WITHOUT AN ERROR?
Yes No
002
Replace the system board.
003
DID YOU REMOVE THE MEMORY MODULE KIT IN
CONNECTOR 1?
Yes No
004
Go to Step 007.
005
– Reinstall the memory module in connector 1.
– Run the memory test.
Use the RUN TESTS ONE TIME option.
DID THE MEMORY TESTS END WITHOUT AN ERROR?
Yes No
006
Replace the memory module in connector 1.
If that does not correct the problem, replace the
system board.
007
(Step 007 continues)
Model L40 SX (8543)25
(CONTINUED)
007 (continued)
DID YOU REMOVE THE MEMORY MODULE KIT IN
CONNECTOR 2?
Yes No
008
Go to Step 011.
009
– Reinstall the memory module in connector 2.
– Run the memory test.
Use the RUN TESTS ONE TIME option.
DID THE MEMORY TESTS END WITHOUT AN ERROR?
Yes No
010
Replace the memory module in connector 2.
If that does not correct the problem, replace the
system board.
011
Check if the actual memory size of the memory module is
different from the displayed memory size on the screen. If
the problem occurs intermittently, run the memory tests
multiple times to have an error log.
26IBM Mobile Systems HMM - Volume 1
Power Systems Checkout
Note
One or all of the batteries can discharge if there is a
short circuit in the computer.
1. Replace the failing FRU if the power supply problem
is caused by a short circuit.
2. Determine if one (or all) of the batteries have become
discharged. Replace a discharged battery with a
known-good spare (or recharge the main or standby
battery.)
The test procedures for each power supply are found on
the following pages.
“Testing the AC Adapter” on page 29.
“Testing the Rechargeable Battery” on page 29.
“Testing the Backup Battery” on page 30.
“Testing the Standby Battery” on page 30.
“Testing the Quick Charger” on page 31.
None of the above? Follow the steps below.
001
DID THE PROBLEM OCCUR ONLY WHEN USING THE
AC ADAPTER?
Yes No
002
Go to Step 004.
003
Go to “Testing the AC Adapter” on page 29. If that does
not correct the problem, replace the system board.
004
DID THE PROBLEM OCCUR ONLY WHEN USING THE
BATTERY?
Yes No
005
Go to Step 011 on page 28.
006
DOES A FULLY-CHARGED BATTERY DISCHARGE
QUICKLY?
Yes No
007
Go to Step 010 on page 28.
Model L40 SX (8543)
27
(CONTINUED)
008
– Run advanced diagnostics for all devices using the AC
adapter. Use the ‘RUN TEST ONE TIME’ option.
DID ALL THE TESTS END WITHOUT AN ERROR?
Yes No
009
Follow the instructions on the screen.
If the instructions do not appear or do not correct the
problem, replace the system board.
010
Go to “Testing the Rechargeable Battery” on page 29. If
that does not correct the problem, replace the system
board.
External CRT display
Cables to the hard disk drive
Cables to the diskette drive
Power cable to the LCD
Signal cables to the LCD
– Connect the AC adapter and power-on the computer.
DID YOU HEAR ONE LONG OR TWO SHORT BEEPS?
Yes No
012
Replace the system-status display to verify the fix. If
the problem still remains, put back the original
system-status display, then replace the system
board.
013
– Suspect one of the options or devices. Reinstall each of
the options or devices to the computer one at a time,
and power-on the computer to see if the original problem
occurs.
(Step 013 continues)
28IBM Mobile Systems HMM - Volume 1
013 (continued)
– Replace the last installed option or device when the
problem occurs.
Testing the AC Adapter
1. If a noise can be heard from the AC adapter when it
is plugged into line voltage, replace the AC adapter.
If a noise still comes from the AC adapter, suspect
the computer.
If not, the AC adapter has a problem. Replace the
AC adapter with the original one, then go to the next
step.
2. Measure the output voltage at the plug of the AC
adapter cable.
1
2
PinVoltage (V dc)
1+14.3 to +15.8
2Ground
If the voltage is not correct, replace the AC adapter.
Testing the Rechargeable Battery
1. Remove the keyboard.
2. Set the rechargeable battery in place without
connecting any external power devices.
3. Measure the voltage between terminals 1 (+) and 2
(−) and note the voltage.
1(+)
4. Using the AC adapter, apply external power to the
computer. Make sure that a charge arrow appears in
the system-status display.
5. Measure the voltage again between terminals
1 (+) and 2 (−).
If the voltage is not greater than the one measured in
Step 3, replace the AC adapter. If the voltage is
greater than the one measured in Step 3, go to the
next step.
Model L40 SX (8543)29
6. Remove the rechargeable battery from the computer.
7. Measure the voltage at the battery terminals.
3( )
2(T)
1(+)
PinVoltage (V dc)
1+8.5 to +12.6
3Ground
If the voltage is not correct, the rechargeable battery
is discharged or defective. If the voltage is correct,
go to the next step.
8. Using a low-power ohm meter, measure the
resistance at the battery terminals between
2 (T) and 3 (−). The resistance must be
4 kilohms to 30 kilohms.
If the resistance is out of range, replace the
rechargeable battery.
Testing the Backup Battery
1. Remove the keyboard and the top cover.
2. Measure the voltage at the connectors of the backup
battery.
2
PinVoltage (V dc)
1+2.8 to +3.2
2Ground
1
If the voltage is not correct, the backup battery is
discharged by a short circuit or is defective.
Testing the Standby Battery
Note: The charging time required is 48 hours.
1. Remove the keyboard and the top cover.
2. Connect the AC adapter to the computer.
30IBM Mobile Systems HMM - Volume 1
3. Disconnect the standby battery connector from the
system board and measure the voltage at the
connector of the standby battery as shown.
(Black)
2
PinVoltage (V dc)
1+3.0 to +4.5
2Ground
(Red)
1
If the voltage is correct, perform the failing operation
with a fully-charged standby battery to isolate the
problem.
If the voltage is not correct, continue.
4. Measure the output voltage at the connector on the
system board.
(-) (+)
(Top View)
If the voltage is higher than measured in Step 3, the
standby battery is discharged or is defective.
If the voltage is the same as measured in Step 3 or
less than +3.0 V dc, replace the standby battery. If
the problem remains, replace the system board.
Testing the Quick Charger: If a noise can be
heard from the operating quick charger, replace it.
1. Perform steps 6 through 8 on page 30 of the “Testing
the Rechargeable Battery” to verify the rechargeable
battery for correct operation.
2. Plug the quick charger into an electrical outlet.
If the amber power indicator does not turn on, replace
the quick charger.
3. Install the rechargeable battery.
If the green charging indicator is not blinking, replace
the quick charger.
Model L40 SX (8543)31
Symptom-to-FRU Index
The Symptom-to-FRU Index lists symptoms and errors and
the possible causes. The most likely cause is listed first.
If the computer displays an error message, first replace
FRUs listed in the error message. An
X
in an error
message can be any number.
Note: If you have an IBM device with its own service
manual or a device not supported by the advanced
diagnostics tests, refer to the manual for that
device.
Symptom/ErrorFRU/Action
One or more keys do not
work.
(See “External
Keyboard/Auxiliary Input
Device Checkout” on
page 465 before replacing
any FRUs.)
No beep and a blank or
unreadable display during
POST.
(See “Power Systems
Checkout” on page 27
before replacing any FRUs.)
No beep with a normal
display during POST.
Continuous beep 1. System Board
Repeating short beeps.
(See “External
Keyboard/Auxiliary Input
Device Checkout” on
page 465 before replacing
any FRUs.)
Dew Point or Temperature
icon appears with one long
and one short beep.
One long and one short
beep.
One long and two short
beeps.
One short beep and a
blank, unreadable, or
flashing display with no
external display attached.
One short beep and
Diskette Prompt or a
program load from the hard
disk drive or unable to read
diskette(s).
1. Keyboard
2. System Board
1. System Board
2. Any options or devices
3. Power source when
failing
4. Speaker
1. Speaker
2. System Board
2. Any options or devices
1. System Board
2. Keyboard
1. System Board
2. Power source when
failing
1. System Board
2. Power source when
failing
1. System Board
2. Power source when
failing
1. Display (LCD)
2. System Board
3. Power source when
failing
1. Diskette Drive
2. System Board
3. Diskette Drive Cable
32IBM Mobile Systems HMM - Volume 1
Symptom/ErrorFRU/Action
Two short beeps and a
blank display.
External display problems.
(See “External Display
Self-Test” on page 464
before replacing any FRUs.)
Incorrect memory size
during POST.
(See “Memory Checkout” on
page 25 before replacing
any FRUs.)
Computer hang-up or
intermittent hang-up.
Computer does not suspend
or resume.
(Check the Suspend icon to
make sure of the failure.)
Computer does not power
off.
Real-time clock inaccurate. 1. System Board
Printer problems. 1. See “Printer
Serial or parallel port device
problems.
ICON is incorrectly blinking
or stays on.
ICON incorrectly remains
off, but diagnostics runs
without an error.
Internal Data/Fax Modem
does not communicate with
a remote modem or a fax.
(See “Fax/Modem
Checkout” on page 466
before replacing any FRUs.)
101, 103, 107, 111 1. System Board
109, 110, 121
(See “Memory Checkout” on
page 25 before replacing
any FRUs.)
1. System Board
2. Any options or devices
1. External Display
2. System Board
1. System Board
2. Memory Module Kits
1. System Board
2. Hard Disk Drive
3. Math Coprocessor
4. Replace the last device
being tested
(See “Undetermined
Problem” on page 36.)
1. System Board
2. System-Status
Display Assembly
3. Any options or devices
1. System-Status
Display Assembly
2. System Board
Checkout” on
page 468.
1. Device
2. Cable
3. System Board
1. System Board
2. Related Device
1. System Board
2. Related Device
3. System-Status
Display Assembly
1. Internal Data/Fax
Modem
(Make sure
Modem power
set to on in the Set
Features program.)
2. Hard Disk Drive
3. Diskette Drive
4. Any attached devices
1. Memory Module Kits
2. System Board
Data/Fax
option is
Model L40 SX (8543)33
Symptom/ErrorFRU/Action
122, 124 1. System Board
1231. Hard Disk Drive
141 1. System-Status
149 1. System Board
161 1. Run Automatic
162 1. Run Automatic
1631. Time and Date Set?
164
(See “Memory Checkout” on
page 25 before replacing
any FRUs.)
199 1. See “Checking
1XX
(not listed above)
211
(on POST)
221
(on POST)
204, 214, 224, 240 1. System Board
25X 1. System Board
2XX
(not listed above)
(See “Memory Checkout” on
page 25 before replacing
any FRUs.)
2. Auxiliary Input Device
3. Keyboard
2. System Board
3. Hard Disk Drive Cable
Display Assembly
2. System Board
2. Hard Disk Drive
3. Hard Disk Drive Cable
Configuration
2. Backup Battery
3. System Board
Configuration, then
check the installed
devices using the
View configuration
utility.
2. System Board
3. Diskette Drive
4. Hard Disk Drive
5. Math Coprocessor
6. Diskette Drive Cable
7. Hard Disk Drive Cable
2. System Board
1. Run Automatic
Configuration
2. Memory Module Kits
3. System Board
Installed Devices” on
page 37.
1. System Board
1. System Board
2. Memory Module Kits
1. System Board
2. Memory Module Kits
1. Memory Module Kits
2. System Board
34IBM Mobile Systems HMM - Volume 1
Symptom/ErrorFRU/Action
301, 302 1. System Board
303 1. System Board
304, 305
(See “External
Keyboard/Auxiliary Input
Device Checkout” on
page 465 before replacing
any FRUs.)
306, 310 1. System Board
308 1. Numeric Keypad
3XX
(not listed above)
(See “External
Keyboard/Auxiliary Input
Device Checkout” on
page 465 before replacing
any FRUs.)
602, 653, 654 1. Defective diskette
655, 660, 661 1. System Board
6XX
(not listed above)
7XX 1. Math Coprocessor
9XX 1. System Board
1107 1. Communication
11XX 1. System Board
1207 1. Communication
12XX1. Any serial adapter
1705 to 1707, 1709, 1711,
1718 to 1720, 1730, 1732
2. Keyboard
2. Numeric Keypad
3. Keyboard
1. Keyboard
2. System Board
3. Numeric Keypad
1. System Board
2. Auxiliary input device
3. Keyboard
2. Diskette Drive
3. System Board
1. Diskette Drive
2. System Board
3. Diskette Drive Cable
2. System Board
(IBM does not supply a
math coprocessor)
2. Any parallel Device
3. Communication Cable
Cable
2. Any serial adapter
3. Communication Cable
Cable
2. System Board
3. Any serial device
4. Communication Cable
1. Hard Disk Drive
(Reformatting the hard
disk can recover from
the problem.)
Model L40 SX (8543)35
Symptom/ErrorFRU/Action
17XX
(not listed above)
24XX 1. System Board
5001 to 5016 1. System Board
5017 to 502X 1. System Board
503X1. External CRT Display
8601, 8602 1. Pointing Device
8604 1. System Board
86XX
(not listed above)
101XX
(See “Fax/Modem
Checkout” on page 466
before replacing any FRUs.)
102XX 1. System-Status
1. Hard Disk Drive
2. System Board
3. Hard Disk Drive Cable
2. LCD Display Assembly
2. System Board
2. System Board
3. Numeric Keypad
1. System Board
2. Pointing Device
3. Numeric Keypad
1. Internal Data/Fax
Modem
2. System Board
3. Any serial device
Display Assembly
2. System Board
3. Related device
Undetermined Problem
You are here because the diagnostics tests did not identify
the failing FRU.
Check the power supply in use (see “Power Systems
Checkout” on page 27). If the power systems are
operating correctly, return here and continue with the
following procedure.
1. Power-off the computer and remove the battery packs
from the computer.
2. Remove or disconnect one of the following devices or
adapter (do not isolate FRUs that are known to be
good).
a. Non-IBM devices
b. Modem, printer, mouse, or other external device
c. IC DRAM card
d. Hard disk drive (fixed disk drive) or diskette drive
e. Any adapter and device.
3. Power-on the computer and start the system program.
4. If the symptom remains, repeat steps 2 and 3 until
you find the failing FRU or until all FRUs have been
removed.
5. If all of the FRUs listed have been removed and the
problem remains, replace the system board.
36IBM Mobile Systems HMM - Volume 1
Related Service Procedures
Checking Installed Devices
The Installed Devices List shows the presence of devices
in the computer. If an adapter or device is missing from
the list, you might have one of the following conditions.
An adapter or device is defective.
The device missing from the list is an unrecognizable
drive or adapter.
The device missing from the list requires an additional
diskette. (See the device service manual.)
A power supply voltage is incorrect (see “Power
Systems Checkout” on page 27).
If the adapter is on the list, run the adapter diagnostics
tests. If the list contains an adapter or device that is not
installed, go to “Undetermined Problem” on page 36.
Power-on Password
Important
This information is not available in this HMM online
format. See your IBM Servicer or IBM Authorized
Dealer for this procedure.
How to Run Advanced Diagnostics
1. Power-off the computer.
2. Insert the backup copy of the Reference Diskette into
the diskette drive.
3. Power-on the computer.
4. Advance to the Main Menu.
5. Press Ctrl+A to run the System Checkout.
Model L40 SX (8543)
37
Product Overview
The following table provides a brief overview of the
computer features.
FeatureDescription
Processor (MHz)386SX 20-Mhz
Bus ArchitectureAT Bus
Memory (Standard)2MB
Memory (Maximum)18MB
VideoVGA
Diskette Drive3.5-inch
Hard Drive60MB
38IBM Mobile Systems HMM - Volume 1
FRU Removals and Replacements
Follow the numerical sequence in the FRU removal
sequence list and the exploded view to remove or
disconnect parts in the correct order. The letters in
parentheses in the list indicate screw types. See the
“Screw Size Chart” on page 19 to match the letters to the
correct screw type and size before replacing each screw.
Safety Notice 8: Translation on page 13
Before removing any FRU, power-off the computer,
unplug all power cords from electrical outlets, remove
the battery pack, then disconnect any interconnecting
cables.
Safety Notice 1: Translation on page 7
Before the computer is powered-on after FRU
replacement, make sure all screws, springs, or 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.
.1/ Battery Pack
.2/ Three Screw Covers and Three Screws (C)
.3/ Loosen Keyboard Assembly
(Raise front until it clears case.)
.4/ Two Ribbon Cables and Keyboard
(Slide keyboard forward and flip it over in front of
computer.)
.5/ Three Top Cover Screws (C)
(Inside right and left rear access doors along top
edge)
.6/ Two Status Display Ribbon Cables
.7/ Top Cover
(Use small screwdriver to release latch on left side,
if necessary.)
.8/ Two Status Display Screws (F)
(One on each end)
.9/ Status Display Assembly
(contains on/off and power saver switches)
.1ð/ Four Hinge Screws (C)
(Two on each end, inside two rear access doors)
.11/ Left Hinge Cables
.12/ Right Hinge Cables
.13/ LCD Assembly
.14/ Memory Modules
(Do not install two 4MB memory module kits. Install
a 2MB memory module kit in connector 1 and a
4MB or 8MB memory module kit in connector 2.)
.15/ Two Screws (F)
(At front edge of diskette drive)
Model L40 SX (8543)39
.16/ Two Diskette Drive Ribbon Cables
.17/ Diskette Drive and Drive Mounting Bracket
.18/ Standby Battery
.19/ Battery Shield
.2ð/ Backup Battery
.21/ Adapter Bezel
.22/ One Screw (F)
(In corner of serial/modem card)
.23/ Serial/Modem Card
.24/ Two Screws (F)
(At front edge of hard disk drive)
.25/ Two Ribbon Cables and Hard Disk Drive
(Have customer backup all information on hard disk
drive before removal.)
.26/ External Adapter and Battery Doors
.27/ Eight System Board Screws (F)
.28/ One Screw (C)
(Inside right-rear access door)
.29/ Two Threaded Hex Spacers
(Inside right-rear access door)
Remaining System Board Cables
.3ð/System Board
(When replacing system board, install old memory
module kits and math coprocessor on new system
board. Run Automatic Configuration using
customer's backup Reference Diskette.)
5.25-inch Drive Adapter/A (360KB/1.2MB)15F7996
6154 Real-Time Coprocessor (128KB)60X8192
6166 Real-Time Coprocessor (512KB)76X1013
8MB Memory Module (80ns)79F1004
8MB Memory Module Kit (80ns)64F3607
80386 Memory Expansion Adapter72X6671
AC Adapter79F0993
ActionMedia II Display Adapter69F9731
ActionMedia II Capture Option69F9735
ActionMedia II Video Cable69F9737
ActionMedia II Audio/Video Capture Cable69F9736
ActionMedia II Display CD-ROM Cable69F9747
Carrying Case79F3869
Communication Cable (for 79F0996)94X1540
Data/Fax Modem (U.S., Canada only)79F0996
Diskette Drive Bus Adapter72X8524
Enhanced 5250 Emulation Adapter64G3956
External Diskette Drive Adapter72X6757
Game Control Adapter8529151
PC Network Adapter8286171
PC Network Adapter II72X8105
PC Network Baseband Adapter72X8101
PhoneCommunicator Adapter33F4846
PhoneCommunicator Cable (Black-L)57F1261
PhoneCommunicator Cable (Black-S)57F1262
PhoneCommunicator Cable (Beige-L)57F1263
PhoneCommunicator Cable (Beige-S)57F1264
Printer Cable8529214
Quick Charger79F0995
Realtime Interface Coprocessor 6-Port V.3572F0164
Screen Reader Adapter33F4842
Screen Reader Keypad1393515
Screen Reader Keypad Cable72X8537
SCSI Adapter/A (with Cache)85F0063
SCSI Adapter/A (without Cache)85F0002
SCSI Cable (internal)64F4127
SDLC Adapter8286099
Serial Adapter79F0998
Serial Adapter Cable8286170
Serial Adapter Connector8286194
Serial/Parallel Adapter8286147
SpeechViewer Adapter15F8511
Strap 07G1449
Token-Ring 16/4 Adapter93F0334
Token-Ring Adapter16F0463
Token-Ring Adapter (with RPL Module)83X7839
Model L40 SX (8543)45
Keyboard
Arabic 1396825
Belgian 1396812
Canadian French 1396810
Danish 1396813
Dutch 1396817
French 1396814
German 1396815
Greek 1396826
Hebrew 1396827
Icelandic 1396828
Italian 1396816
Norwegian 1396818
Portuguese 1396819
Spanish 1396820
Spanish Speaking 1396811
Swedish/Finish 1396821
Swiss/French 1396822
Swiss/German 1396823
Turkish 1396829
U.K. English 1396824
U.S. English 1396181
Numeric Keypad and Mouse
U.S. 1396182
Arabic 1396806
Canadian French 1396800
French 1396801
German 1396802
Greek 1396807
Italian 1396803
Spanish 1396804
Swedish/Finland 1396805
Swiss/French 1396809
Swiss/German 1396808
Trackpoint (Model L40 SX) 1397090
Note: The hardware configuration in the Setup program is
the responsibility of the customer. However, some
settings can cause symptoms of a hardware failure
to appear during operation or diagnostic checkout.
Setup affects power management, parallel and
serial ports, disk drive operation, operating speed,
boot source, and memory configuration. Refer to
the
Guide to Operations
Setup.
001
HAS A REST/RESUME PROBLEM BEEN REPORTED?
Yes No
002
Go to Step 010 on page 49.
003
1. Power-on the computer.
2. Make sure the power button is set up for
REST/RESUME in Setup configuration.
3. Press the power button to put the computer into
REST.
Note: LCD display and backlight off, all LEDs off (except
charge indicator when AC is connected and battery
pack is installed).
DID THE COMPUTER REST?
Yes No
for information about
004
Do the following:
Replace the system board.
If that does not solve the problem, replace the
DC/DC board.
If the problem remains, replace the top cabinet
assembly.
005
Press the power button to bring the computer out of REST.
DID THE COMPUTER FAIL TO RESUME?
Yes No
006
Go to Step 010 on page 49.
007
(Step 007 continues)
48IBM Mobile Systems HMM - Volume 1
007 (continued)
Check backup battery connections and voltage (+5 V dc).
ARE THE BACKUP BATTERY AND BATTERY
CONNECTIONS OK?
Yes No
008
Replace the battery and verify operation.
009
Do the following:
Replace the system board.
If that does not solve the problem, replace the DC/DC
board.
If the problem remains, replace the top cabinet
assembly.
010
1. Connect the AC adapter to the computer and to the
AC supply.
2. Make sure there is no diskette in the diskette drive.
3. Disconnect any peripherals from the computer.
4. Power-on the computer.
IS THE POWER LED LIT?
Yes No
011
Go to Step 029 on page 51.
012
IS THE POWER LED AMBER?
Yes No
013
IS THE POWER LED GREEN?
Yes No
014
Replace the top cabinet. If that does not solve
the problem, replace the system board.
015
Replace FRUs in the following order:
AC Adapter
DC/DC Board
System Board
Top Cabinet
Model N45SL (2614)49
016
IS THE CHARGE LED LIT?
Yes No
017
Replace FRUs in the following order:
AC Adapter
Battery Pack
Battery Contact Cable Assembly
Top Cabinet
018
IS THE CHARGE LED RED?
Yes No
019
DOES THE LCD DISPLAY TURN ON?
Yes No
020
Adjust the brightness and contrast controls. If
this does not correct the problem, return to
Step 001.
(CONTINUED)
021
DOES THE COMPUTER BOOT FROM THE HARD
DRIVE?
Yes No
022
If you receive a POST error, go to the
Symptom-to-FRU index. If you do not receive
a POST error, go to “Undetermined Problem”
on page 62.
023
IS THE BACKLIGHT ON?
Yes No
024
Go to Step 029 on page 51.
025
(Step 025 continues)
50IBM Mobile Systems HMM - Volume 1
025 (continued)
IS THE DISPLAY READABLE?
Yes No
026
Go to Step 029.
027
If you receive a POST error, go to the
Symptom-to-FRU index. If you do not receive a
POST error, go to “Undetermined Problem” on
page 62.
028
Replace the battery contact cable assembly. If this does
not correct the problem, replace the battery pack.
029
1. Disconnect the computer from AC power.
2. Remove the battery pack.
3. Open the computer and look for damaged or
unconnected cables.
ARE THE CABLES OK?
Yes No
030
Reconnect or replace the cables, then close the
computer. Verify operation.
031
– Close the computer and install a freshly charged battery
pack. Power-on the computer.
DO ANY LEDS LIGHT?
Yes No
032
Replace FRUs in the following order:
Top Cabinet
DC/DC Board
System Board
033
DOES THE LCD BACKLIGHT LIGHT?
Yes No
034
(Step 034 continues)
Model N45SL (2614)
51
034 (continued)
Replace FRUs in the following order:
DC/DC Board
System Board
LCD Display Panel
035
DOES THE COMPUTER ATTEMPT TO AUTOBOOT?
Yes No
036
Replace FRUs in the following order:
Suspected Drive
System Board
037
IS THE OPERATING SYSTEM PROMPT LEGIBLE?
Yes No
038
Replace FRUs in the following order:
Top Cabinet Assembly
System Board
(CONTINUED)
039
Replace the system board.
52IBM Mobile Systems HMM - Volume 1
Symptom-to-FRU Index
The Symptom-to-FRU Index lists the symptoms and errors
and the possible causes. The most likely cause is listed
first.
Note: Perform the FRU replacement or actions in the
sequence shown in the FRU/Action columns. If a
FRU did not solve the problem, put the original part
back in the computer. Do not replace a
non-defective part.
This index can also be used to help you decide which
FRUs to have available when servicing a computer.
Note
For IBM devices not supported by the N45
diagnostics, see the manual for that device.
Symptom/ErrorFRU/Action
No access to A or C drive
after POST.
“CHECKSUM ERROR! Bad
image file.
ERROR occurred while
reading file.”
“Device error during erasing
process.”
“Device error during
programming process.”
“DISK ERROR: Bad disk
controller!”
“DISK ERROR: Cannot
reset drive!”
“DISK ERROR: CRC error!” 1. Diskette
“DISK ERROR: Data
Corrected!”
1. Ensure boot
sequence is not set
to “Monitor.”
1. Advanced
Diagnostics diskette
1. System Board
1. DC-to-DC board
2. System Board
1. Check disk drive
cable connection.
2. Diskette Drive Cable
1. Verify drive
installation.
2. Diskette Drive
3. System Board
2. Diskette Drive Cable
3. Run Advanced
Diagnostics to test
drive.
4. Diskette Drive
5. System Board
1. If this message
occurs regularly, see
“DISK ERROR: CRC
error!”
Model N45SL (2614)53
Symptom/ErrorFRU/Action
“DISK ERROR: Disk not
bootable!”
“DISK ERROR: DMA
overrun!”
“DISK ERROR: Drive not
ready!”
“DISK ERROR: Invalid
address mark!”
1. Use a bootable
diskette.
2. For a hard disk,
reinstall the operating
system.
3. Back up the hard disk,
if possible, and run
PREP to reinitialize the
disk (see “Running
PREP” on page 64).
Reformat disk and
install operating
system.
4. Hard Disk Drive
1. Diskette Drive
2. System Board
1. Remove and reinsert
diskette.
2. Verify the correct drive
was specified.
3. Diskette Drive
1. If the problem is a
diskette:
a. Copy any
b. Diskette
c. Diskette Drive
2. If the problem is a
hard disk:
a. Back up the hard
b. Hard Disk Drive
readable files to
another diskette
and reformat
faulty diskette. If
bad sectors are
reported, discard
the faulty diskette.
disk, if possible,
and run PREP to
reinitialize the disk
(see “Running
PREP” on
page 64).
Reformat disk and
install operating
system.
54IBM Mobile Systems HMM - Volume 1
Symptom/ErrorFRU/Action
“DISK ERROR: Invalid data
read!”
“DISK ERROR: Must run
SETUP to boot from
Winchester!”
“DISK ERROR: No
bootable partitions”
1. If the problem is a
2. If the problem is a
1. Run Setup program
2. System Board
1. Retry the boot
2. Format partition and
diskette:
a. Copy any
readable files to
another diskette
and reformat
faulty diskette. If
bad sectors are
reported, discard
the faulty diskette.
b. Diskette
c. Diskette Drive
hard disk:
a. Back up the hard
disk, if possible,
and run PREP to
reinitialize the disk
(see “Running
PREP” on
page 64).
Reformat disk and
install operating
system.
b. Hard Disk Drive
to specify correct
hard disk drive type.
command syntax and
verify a valid partition
is selected using the
DOS “FDISK”
command.
install operating
system using the DOS
“FORMAT” command.
Model N45SL (2614)55
Symptom/ErrorFRU/Action
“DISK ERROR: Sector not
found!”
“DISK ERROR: Seek
failure!”
“ERROR: Bad configuration
information found in CMOS!”
“ERROR: Base memory
size error: SETUP: XXXK
ACTUAL: XXXK!”
“ERROR: Can't locate input
file.”
“ERROR: CMOS memory
failure!”
“ERROR: CPU failure!” 1. System Board
1. If the problem is a
diskette:
a. Copy any
readable files to
another diskette
and reformat
faulty diskette. If
bad sectors are
reported, discard
the faulty diskette.
b. Diskette
c. Diskette Drive
2. If the problem is a
hard disk:
a. Back up the hard
disk, if possible,
and run PREP to
reinitialize the disk
(see “Running
PREP” on
page 64).
Reformat disk and
install operating
system.
b. Hard Disk Drive
1. Copy any readable
files to another
diskette and format
the faulty diskette.
2. If bad sectors are
reported, discard the
faulty diskette.
3. Diskette
4. Diskette Drive
5. System Board
1. Run Setup program
to reconfigure.
2. Backup Battery
3. System Board
1. Run Setup program
to verify correct base
memory size.
2. Run the Advanced
Diagnostics Memory
Test to check base
memory.
the software, or have
the customer contact
the software
manufacturer or
dealer and report the
problem. Unless this
message occurs
during the power-up
sequence, the
problem is with the
software.
2. Power-off computer,
wait 15 seconds, then
power-on computer. If
the message
reappears, replace
system board.
1. Run Setup program
to verify the extended
RAM memory size
matches the memory
installed.
2. Check the memory
module installation.
3. Run Advanced
Diagnostics to test
extended memory. If
you cannot boot the
computer, replace the
system board and try
again. If the tests
identify an expansion
memory module,
replace it. If the tests
identify a problem in
the base memory,
replace the system
board.
1. Correct Advanced
Diagnostics diskette?
2. Advanced Diagnostics
diskette
1. Correct Advanced
Diagnostics diskette?
2. Advanced Diagnostics
diskette
1. Correct Advanced
Diagnostics diskette?
2. Advanced Diagnostics
diskette
Model N45SL (2614)57
Symptom/ErrorFRU/Action
“ERROR: Invalid
command!”
“ERROR: Keyboard not
responding or not
connected!”
“ERROR: Memory parity
failure!”
“ERROR occurred while
reading Boot Sector.”
“ERROR occurred while
reading FAT table.”
“ERROR occurred while
reading root directory.”
“ERROR: Please replace
the backup battery!”
“Error programming FLASH
Device. Retrying.”
“ERROR: RAM failure!
Address: XXXX”
“ERROR: RAM failure!
SIMM module: XXXX”
1. Retry the command.
2. Try another copy of the
software or have the
customer contact the
software manufacturer
or dealer and report
the problem.
3. System Board
1. Check keyboard
connections.
2. Keyboard
3. System Board
1. Run Advanced
Diagnostics Memory
Test to check base
and extended
memory.
2. Memory Module
3. System Board
1. Advanced
Diagnostics diskette
1. Advanced
Diagnostics diskette
1. Advanced
Diagnostics diskette
1. If backup battery was
recently replaced, run
Setup program to
configure computer.
2. Backup Battery
3. System Board
1. System Board
1. Inspect memory
modules for proper
installation.
2. Swap the installed
memory modules with
known good modules.
3. Memory Board
4. System Board
1. Inspect the memory
modules for proper
installation.
2. Swap the installed
memory modules with
known good modules.
3. Memory Board
4. System Board
58IBM Mobile Systems HMM - Volume 1
Symptom/ErrorFRU/Action
“ERROR: ROM checksum
failure!”
“ERROR: System control
processor failure!”
“ERROR: The image file is
not for this machine.”
“ERROR: Timer interrupt
failure!”
“ERROR: Wild Hardware
Interrupt.”
“Fatal Error; Cannot
Continue!”
“File not found, try another
diskette.”
“FLASH Device failure!
Device content has been
corrupted.”
“High ROM Checksum
Error! Flash ROM needs to
be reprogrammed”
1. Power-off computer,
1. Power-off computer,
1. Correct Advanced
2. Advanced Diagnostics
1. Power-off computer,
1. Power-off computer,
2. If message reoccurs at
3. System Board
1. Refer to first error
1. Try another
1. System Board
1. BIOS within the Flash
wait 15 seconds, then
power-on computer.
If the message
reappears, replace
system board.
wait 15 seconds, then
power-on computer.
If message
reappears, replace
system board.
Diagnostics diskette?
diskette
wait 15 seconds, then
power-on computer.
If message
reappears, replace
system board.
wait 15 seconds, then
power-on computer.
Rerun the program.
the same place during
operation of a
program, it is probably
software related. Have
the customer contact
the software
manufacturer or dealer
to report problem.
message and follow
instructions to
resolve the problem.
Advanced
Diagnostics diskette.
ROM is corrupt. The
NEWBIOS command
will automatically be
executed. See
“Updating Flash
Memory” on page 65.
Model N45SL (2614)59
Symptom/ErrorFRU/Action
“Low ROM Checksum Error!
Flash ROM needs to be
reprogrammed”
“Non-maskable interrupt
received!”
“No system”1. Install the operating
“Not a bootable partition”1. Retry the boot
“Overflow!” 1. Power-off computer,
1. See “Updating Flash
Memory” on page 65.
1. If a software problem
is suspected, have
the customer contact
the software
manufacturer or
dealer and report the
problem.
2. Run Advanced
Diagnostics.
3. AC Adapter
system. Refer to the
operating system
documentation for
instructions.
2. Retry the boot
command syntax and
verify a valid drive was
selected.
command syntax and
make certain a valid
partition was
selected.
2. Back up the hard disk,
if possible, and run
PREP to reinitialize the
disk (see “Running
PREP” on page 64).
Reformat disk and
install operating
system.
3. Hard Disk Drive
wait 15 seconds, then
power-on computer.
If message reappears
during power up,
replace system
board.
2. If a software problem
is suspected, try
another copy of the
program, or have the
customer contact the
software manufacturer
or dealer and report
the problem.
60IBM Mobile Systems HMM - Volume 1
Symptom/ErrorFRU/Action
“Password Security
Violation: System
Shutdown”
“Program verify failure.” 1. System Board
“Remove diskette and insert
again, otherwise reboot.”
“Retries exhausted, please
remove diskette.”
“Slush BIOS Checksum
Error!”
“Slush RAM Data Error!” 1. System Board
“Slush Video Checksum
Error!”
“Wild Interrupt!” 1. Power-off computer,
1. Power-off computer,
wait 15 seconds, then
power-on the
computer.
2. Retry the password. If
password is unknown,
clear the password
(see “Power-on
Password” on
page 63).
1. Try another
Advanced
Diagnostics diskette.
2. System Board
1. Try another
Advanced
Diagnostics diskette.
2. System Board
1. System Board
1. System Board
wait 15 seconds, then
power-on computer.
Rerun the program.
2. If the message
reoccurs at the same
place during the
operation of a
program, it is probably
software related. Have
the customer contact
the software
manufacturer or dealer
to report problem.
3. If the message
reoccurs randomly, run
Advanced Diagnostics.
Replace any faulty
assemblies.
Model N45SL (2614)61
Undetermined Problem
You are here because the diagnostics tests did not identify
the failing FRU.
1. Power-off the computer and remove the battery packs
from the computer.
2. Remove or disconnect one of the following devices or
adapter (do not isolate FRUs that are known to be
good).
a. Non-IBM devices
b. Modem, printer, mouse, or other external device
c. IC DRAM card
d. Hard disk drive (fixed disk drive) or diskette drive
e. Any adapter and device.
3. Power-on the computer and start the system program.
4. If the symptom remains, repeat steps 2 and 3 until
you find the failing FRU or until all FRUs have been
removed.
5. If all of the FRUs listed have been removed and the
problem remains, replace the system board.
62IBM Mobile Systems HMM - Volume 1
Related Service Procedures
This section provides related service information on the
following:
“Power-on Password”
“Status Indicators”
“How to Run Advanced Diagnostics”
“Running PREP” on page 64
“Updating Flash Memory” on page 65
Power-on Password
Important
This information is not available in this HMM online
format. See your IBM Servicer or IBM Authorized
Dealer for this procedure.
Status Indicators
LightStatus Indicated
Hard disk drive is active
Diskette drive is active
Keyboard is in Caps Lock mode
Keyboard is in Num Lock mode
Imbedded keypad is locked on
Keyboard is in Scroll Lock mode
AmberComputer is operating
GreenComputer is operating
Red (flashing) Battery pack is almost
Red (steady) Battery pack is
GreenBattery pack is fully charged
Amber Battery pack is being fast
RedProblem in the battery circuit
OffComputer is operating from
from AC power
from battery power
discharged
completely discharged
and being
trickle charged
charged
AC with
no battery pack installed
How to Run Advanced Diagnostics
1. Power-off the computer.
2. Insert the Advanced Diagnostics Diskette into the
diskette drive.
3. Power-on the computer.
Model N45SL (2614)
63
4. Press Ctrl+Alt+Ins to start the Monitor program.
5. In the Monitor program, type BF and press Enter to
boot from the diskette drive.
6. Follow the Advanced Diagnostics menus to test the
computer. (Press F1 for help.)
Running PREP
The PREP utility initializes and prepares the hard disk
surface for storage of data. It performs a low level format
then checks for bad sectors. If any bad sectors are found,
they are marked in a way that prevents data from being
stored in them.
There are two situations when PREP is used:
1. To prepare the hard disk surface for formatting when
installing a new hard disk drive.
2. To exclude sectors of the hard disk that have become
unusable, indicated by intermittent or continuous hard
disk drive read failures.
Warning: PREP erases all data on the hard disk. If
possible, back up the data on the hard disk to diskettes
before running PREP.
To run PREP:
1. Boot the Advanced Diagnostics diskette.
2. Press the right arrow key to select the “Run Tests”
menu.
3. Press the down arrow key to select “Advanced
Utilities” from the menu and press Enter.
4. Select “PREP” and press Enter.
PREP displays its version number, a list of informational
messages, and then asks if you want to proceed.
Do you want to proceed with PREP (Y/N)?
Press N if you want to cancel PREP and return to the DOS
command line. Press Y to continue with PREP.
PREP asks for the hard disk drive unit number
(drive C = 0 and D = 1).
Hard disk drive unit number (0 - 7):
Enter the drive number. You will then be offered one more
chance to cancel PREP. PREP will prompt you to press P
to continue. Pressing any other key will cancel PREP and
return you to the DOS prompt.
PREP first scans the hard disk for bad sectors that have
previously been marked. It displays the message:
Scanning for previous bad sectors...
PREP then performs a low level format of the hard disk
surface. It display the message:
64IBM Mobile Systems HMM - Volume 1
Initializing the disk...
PREP will then write data to each sector of the hard disk
and read this data back to verify each sector. This is
repeated four times. PREP displays the message:
Verify: pass n, Cylinder xxx
Where n is the number of the current pass (1-4) and
the current cylinder under test.
If any bad sectors are found, PREP marks them to prevent
them from being used when the hard disk is formatted.
After the hard disk is verified, PREP displays the message:
xxx
is
Operation complete, press any key to exit to monitor
The hard disk is now ready to be formatted and have an
operating system loaded onto it.
Updating Flash Memory
Note on Updating Flash Memory
Perform this NEWBIOS function only while operating
on AC power.
Reprogramming Flash BIOS: To reprogram the
Flash ROM, do the following.
1. Access the Monitor program with the Ctrl+Alt+Ins
key combination.
2. Insert the Advanced Diagnostics diskette in the
diskette drive.
3. Type NEWBIOS, then press Enter.
The NEWBIOS function tests the size of the file, the
computer type, and the checksum of the file. After the
tests complete successfully, the Flash ROM is
reprogrammed. The following prompt appears:
Programming success. Press
In order for the computer to read the new code, the
computer must be rebooted. Press Enter to reboot the
computer.
If the NEWBIOS function fails and displays any error
messages, power-off computer, wait 15 seconds, then
power-on computer. If the Flash ROM is corrupt, the
computer will initiate the NEWBIOS function automatically.
Enter
to reboot system...
Model N45SL (2614)
65
Product Overview
The following table provides a brief overview of the
computer features.
FeatureDescription
Processor (MHz)386SL 25-Mhz
Bus ArchitectureAT Bus
Memory (Standard)2MB
Memory (Maximum)8MB
VideoVGA
Diskette Drive3.5-inch
Hard Drive120MB
66IBM Mobile Systems HMM - Volume 1
FRU Removals and Replacements
Follow the numerical sequence in the FRU removal
sequence list and the exploded view to remove or
disconnect parts in the correct order. The letters in
parentheses in the list indicate screw types. See the
“Screw Size Chart” on page 19 to match the letters to the
correct screw type and size before replacing each screw.
Safety Notice 8: Translation on page 13
Before removing any FRU, power-off the computer,
unplug all power cords from electrical outlets, remove
the battery pack, then disconnect any interconnecting
cables.
Safety Notice 1: Translation on page 7
Before the computer is powered-on after FRU
replacement, make sure all screws, springs, or 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.
.1/ Battery Pack
.2/ Three Screws (1-G, 2-J)
(Two on bottom of cabinet near front, one inside
battery compartment)
Loosen Keyboard
.3/ Two Ribbon Cables and Remove Keyboard
.4/ Hinge Covers
(Apply pressure to hinge cover sides and pull up.)
.5/ Memory Module Cover
(Gently pry from rear.)
.6/ Three Screws (1-J, 2-WW)
(One screw at each hinge and one at back edge
under memory module cover.)
.7/ Three LCD Assembly Cables
(These cables attach to underside of LCD
assembly. Observe cable routing and place cables
in same position when replacing top cover.)
.8/ Three Screws and LCD Assembly
(Top cover is part of LCD assembly. Only part of
LCD is shown. Long silver screws are located at
front edge of LCD assembly.)
.13/ Memory Module Expansion Card
.14/ Hard Disk Drive Ribbon Cable
.15/ Hard Disk Drive
(One screw on cabinet bottom holds hard disk drive
in place. Have customer backup hard disk drive
before removing drive. Run Prep after installing
new hard disk drive.)
The diagnostic tests are intended to test
products. Non-IBM products, prototype cards, or modified
options can give false errors and invalid computer
responses.
001
DOES THE PROBLEM APPEAR TO BE A POWER
SUPPLY FAILURE?
Yes No
002
Go to Step 006.
003
DO ALL SYSTEM-STATUS INDICATORS REMAIN OFF?
Yes No
004
Go to Step 006.
005
Go to “Power Systems Checkout” on page 78.
only
IBM
006
– Power-off the computer and all external devices.
– Check all cables and power cords.
– Make sure no diskette is in the drive.
– Power-on all external devices.
– Power-on the computer and check for the following
responses:
1. All system-status indicators appear once for about
1 second.
Note: Some indicators remain on and others go
off after 1 second.
2. Memory test (the number increases.)
3. One or two short beeps.
DID YOU RECEIVE THE RESPONSES LISTED ABOVE?
Yes No
007
1. If the memory count is incorrect, go to “Memory
Checkout” on page 77.
2. Go to “Symptom-to-FRU Index” on page 87.
If that does not correct the problem, go to
“Undetermined Problem” on page 94.
74IBM Mobile Systems HMM - Volume 1
008
– Press Ctrl+Alt+Del. When the cursor moves to the
upper right, press Ctrl+Alt+Ins to start the system
program. If the IBM logo screen does not appear, insert
the backup Reference Diskette into the diskette drive
and repeat this step.
1. If you are not at the Main Menu, follow the
instructions on the screen to advance to the Main
Menu.
If you cannot advance to the Main Menu, go to
“Symptom-to-FRU Index” on page 87.
- or If that does not correct the problem, go to
“Undetermined Problem” on page 94.
Notes:
a. If the computer has an incorrect keyboard or
numeric keypad response, go to “External
Keyboard/Auxiliary Input Device Checkout” on
page 465.
b. If the printer has incorrect responses, go to
“Printer Checkout” on page 468.
c. If the external display has problems such as
jittering, rolling, shifting, or being out-of-focus,
go to “External Display Self-Test” on
page 464.
2. Press Ctrl+A and run the system checkout.
IS THE LIST OF INSTALLED DEVICES CORRECT?
Yes No
009
Go to “Checking Installed Devices” on page 95.
010
– Run the diagnostic tests.
DID THE TEST IDENTIFY A FAILURE?
Note: If the test stops and you cannot continue, replace
the last device tested.
- or If any POST error code appears, go to
“Symptom-to-FRU Index” on page 87.
Yes No
011
You might have an intermittent problem:
Check for damaged cables and connectors.
Reseat all adapters, drives, and modules.
(Step 011 continues)
Model N51 (8551)75
011 (continued)
Start an error log and run the tests multiple
times.
Check the power supply in use when the error
is reported (see “Power Systems Checkout” on
page 78).
Check “Symptom-to-FRU Index” on page 87. If
this does not fix the problem, go to
“Undetermined Problem” on page 94.
012
Go to “Symptom-to-FRU Index” on page 87.
(CONTINUED)
76IBM Mobile Systems HMM - Volume 1
Memory Checkout
Customer diagnostics can eliminate defective memory so
no memory error code appears at power-on reset. After
you replace a defective memory module kit, run 5.Automatic configuration or the new memory will not be
recognized. (If you have to run configuration with your
own diskette, be sure the customer has all the correct
option diskettes available.) Power-off the computer before
removing or replacing parts.
001
– Remove the memory module kit in the connector if
installed.
– Run the memory tests.
Use the RUN TESTS ONE TIME option.
DID THE MEMORY TESTS END WITHOUT AN ERROR?
Yes No
002
Replace the system board.
003
DID YOU REMOVE THE MEMORY MODULE KIT IN THE
CONNECTOR?
Yes No
004
Go to Step 007.
005
– Reinstall the memory module kit in the connector and
run 5. Automatic configuration.
– Run the memory test.
Use the RUN TESTS ONE TIME option.
DID THE MEMORY TESTS END WITHOUT AN ERROR?
Yes No
006
Replace the memory module kit in the connector.
If that does not correct the problem, replace the
system board.
007
If the problem occurs intermittently, run the memory tests
multiple times to have an error log.
Model N51 (8551)77
Power Systems Checkout
Note
One or all of the batteries can discharge if there is a
short circuit in the computer.
1. Replace the failing FRU if the power supply problem
is caused by a short circuit.
2. Determine if one (or all) of the batteries have become
discharged. Replace a discharged battery with a
known-good spare.
The test procedures for each power supply are found on
the following pages.
“Testing the AC Adapter” on page 81.
“Testing the Battery Pack” on page 82.
“Testing the Backup Battery” on page 83.
“Testing the Standby Battery” on page 83.
“Testing the Quick Charger” on page 84.
“Testing the Car Battery Adapter” on page 85.
“Testing the Voltage Converter” on page 85.
None of the above? Follow the steps below.
001
DID THE PROBLEM OCCUR ONLY WHEN USING THE
AC ADAPTER?
Yes No
002
Go to Step 004.
003
Go to “Testing the AC Adapter” on page 81. If “Testing
the AC Adapter” does not correct the problem, replace the
voltage converter.
004
DID THE PROBLEM OCCUR ONLY WHEN USING THE
CAR BATTERY ADAPTER?
Yes No
005
Go to Step 007.
006
Go to “Testing the Car Battery Adapter” on page 85.
007
(Step 007 continues)
78IBM Mobile Systems HMM - Volume 1
007 (continued)
DID THE PROBLEM OCCUR ONLY WHEN USING THE
BATTERY?
Yes No
008
Go to Step 014.
009
DOES A FULLY-CHARGED BATTERY DISCHARGE
QUICKLY?
Yes No
010
Go to Step 013.
011
– Run advanced diagnostics for all devices using the AC
adapter. Use the ‘RUN TEST ONE TIME’ option.
DID ALL THE TESTS END WITHOUT AN ERROR?
Yes No
012
Follow the instructions on the screen.
If the instructions do not appear or do not correct the
problem, replace the system board.
013
Go to “Testing the Battery Pack” on page 82.
If “Testing the Battery Pack” does not correct the problem,
go to “Testing the Voltage Converter” on page 85.
014
– Unplug the AC adapter if used.
– Remove the bottom cover and disconnect the flat cable
from connector CN6 on the voltage converter. (See
page 86 for the connector location.)
– Check that the resistance at connector CN5 is greater
than 5 ohms between pins 7 and 1, and also between 7
and 3.
IS THE RESISTANCE CORRECT?
Yes No
015
Go to Step 017 on page 80.
016
Go to “Testing the Voltage Converter” on page 85. If
“Testing the Voltage Converter” does not correct the
problem, go to Step 017 on page 80.
– Make sure the voltage converter is correctly installed.
– Plug in the AC adapter and power-on the computer.
DID YOU HEAR ONE LONG OR TWO SHORT BEEPS?
Yes No
018
Replace the following FRUs one at a time until the
problem is corrected.
Voltage converter
I/O panel assembly
System board
019
Replace the voltage converter to verify the fix. If the
problem still remains, do the following.
– Suspect one of the options or devices. Reinstall each of
the options or devices to the computer one at a time,
and power-on the computer to see if the original problem
occurs.
– Replace the last installed option or device when the
problem occurs.
80IBM Mobile Systems HMM - Volume 1
Testing the AC Adapter: If the Power-On
indicator is not on, check the power cord of the AC adapter
for proper installation and continuity.
1. If any noise can be heard from the AC adapter when
it is plugged into line voltage, replace the AC adapter
with a new one.
If no noise can be heard from the adapter, go to Step
3.
2. If the noise still comes from the new AC adapter,
suspect the computer. Replace the AC adapter with
the original one, then go to the next step. If no noise
comes from the new adapter, the original adapter has
the problem.
3. Unplug the AC adapter cable from the computer and
measure the output voltage at the plug of the AC
adapter cable.
1
2
PinVoltage (V dc)
1+19.0 to +21.0
2Ground
If the voltage is not correct:
1. Unplug the AC adapter from the ac power outlet
and leave it for a few minutes.
2. Plug the AC adapter into the ac outlet.
3. Measure the output voltage of the AC adapter.
4. If the voltage is still not correct, replace the AC
adapter.
If the voltage is OK, plug the cable into the computer
and try the failing operation again.
If the problem still remains, replace the voltage converter.
If the problem disappeared, suspect the installation and
continuity of the AC adapter cable.
Model N51 (8551)81
Testing the Battery Pack
1. Place the computer bottom-side up.
2. Remove the battery pack and measure the voltage at
the battery terminals between 1 (+) and 3 (−).
1(+)
2(T)
3( )
PinVoltage (V dc)
1+8.5 to +18.0
2Thermal Detection
3Ground
If the voltage is less than +8.5 V dc, the battery
pack is discharged or defective.
If the voltage is more than +8.5 V dc, go to the
next step.
3. Using a low-power ohm meter, measure the
resistance at the battery terminals between
2 (T) and 3 (−). The resistance must be
4 kilohms to 30 kilohms. If the resistance is out of
range, replace the battery pack.
4. Remove the bottom cover and set the battery pack in
place without connecting any external power devices.
5. Measure the voltage at the connector between
terminals 1 (+) and 3 (−) on the voltage converter and
note the voltage.
1(+)
3( )
6. Using the AC adapter, apply external power to the
computer.
Warning: Be careful not to cause a short circuit
while doing the following steps. The charging circuit
is active even if the computer power switch is set to
off.
7. Measure the voltage again between terminals
1 (+) and 3 (−).
If the voltage is not greater than that measured
in Step 5, replace the AC adapter, then go to the
next step.
If the voltage is greater than that measured in
Step 5, the battery pack is good.
82IBM Mobile Systems HMM - Volume 1
Repeat Steps 6 and 7 using a new AC adapter.
If the voltage is still not greater than that
measured in Step 5, replace the voltage
converter.
Testing the Backup Battery
1. Place the computer bottom-side up.
2. Remove the bottom cover.
3. Disconnect the battery connector from the voltage
converter.
4. Measure the voltage of the backup battery.
(Black)
+(Red)
WireVoltage (V dc)
Red+2.5 to +3.7
BlackGround
If the voltage is correct, replace the system board. If it is
not, the backup battery is discharged by a short circuit or
is defective.
Testing the Standby Battery
1. Place the computer bottom-side up.
2. Remove the battery pack from the computer and
remove the bottom cover.
3. Disconnect the battery connector from the voltage
converter.
4. Plug the AC adapter into the computer and power-on
the computer.
5. Measure the output voltage at the connector on the
voltage converter.
Model N51 (8551)83
+ (Red)
1
2
- (Black)
PinVoltage (V dc)
1+4
3Ground
If the voltage is less than +4 V dc, replace the
voltage converter.
If the voltage is greater than +4 V dc, go to the
next step.
6. Power-off the computer.
7. Reconnect the standby battery to the voltage
converter.
8. Power-on the computer and leave it approximately 30
minutes to allow the standby battery to be charged.
9. Power-off the computer again and disconnect the
standby battery.
10. Measure the voltage of the standby battery.
If the voltage is less than 3.5 V dc, replace the
standby battery.
If the voltage is greater than 3.5 V dc, replace
the voltage converter.
Testing the Quick Charger: If an unusual noise
can be heard from the operating quick charger, replace it.
1. Perform steps 1 through 3 on page 82 of the “Testing
the Battery Pack” to verify the battery pack is
operating correctly.
2. Connect the power cord to the quick charger and the
other end to the electrical outlet. Ensure that the
power indicator turns on.
If the power indicator does not turn on, check the
power cord of the quick charger for proper installation
and continuity. If this does not correct the problem,
replace the quick charger.
3. Install the battery pack.
If the charging indicator does not start blinking,
replace the quick charger.
84IBM Mobile Systems HMM - Volume 1
Testing the Car Battery Adapter: If an output
voltage from a cigarette lighter socket is less than 10.5 V
dc, the power-on indicator on the car battery adapter blinks
and a noise can be heard continuously. The battery of the
car is defective.
1. Unplug the car battery adapter from the computer if
connected.
2. Plug the car battery adapter into the cigarette lighter
socket.
Note: If the adapter is already plugged in, be sure to
unplug the adapter from the cigarette lighter
socket, then plug it into the socket again.
3. Measure the output voltage of the car battery adapter.
1
2
PinVoltage (V dc)
1+19.0 to +21.0
2Ground
If the voltage is correct and the power-on indicator on
the car battery adapter is on steady, the car battery
adapter is working correctly.
If the voltage is out of range, do one of the following.
Try the above test procedures in another car if
available.
Replace the car battery adapter if the computer
works with the AC adapter and does not work
with the car battery adapter.
Testing the Voltage Converter: Use the
following procedure to isolate the voltage converter from
the problem.
Note: If the problem occurs only when using the
computer with a good battery pack, replace the
voltage converter.
1. Power-off the computer.
2. Power-off all attached devices and disconnect them
from the computer.
3. Unplug the AC adapter from the computer.
4. Remove the battery pack and the bottom cover.
5. Disconnect the standby-battery connector and the
flexible cable from connector CN6 on the voltage
converter.
6. Power-off the computer.
7. Plug the AC adapter into the computer.
Model N51 (8551)85
Important
The computer goes into suspend mode in about
20 seconds after plugging in the AC adapter.
The following procedure must be performed
during this period. If the computer is already in
suspend mode, unplug the AC adapter and plug
it in again to reactivate it.
8. Check the voltages of the voltage converter using the
following table.
1
24
23
CN8
CN7
CN5
12
40 39
20
2
1
CN6
Connector
CN51
CN72
PinSignalV dc
3
7, 8
9, 10
13
21
32
23, 24
VCCA
VCCB
GND
GND
+20 V dc
POWER_GD
POWER_ON#
VCCG
GND
Min.
+4.9
+4.7
–
–
+19.0
+4.0
0
+4.7
–
V dc
Max.
+5.3
+5.3
–
–
+21.0
+5.3
+0.5
+5.3
–
If all the voltages are correct, the voltage converter is
good.
If +20 V dc is not correct, check the output voltage of
the AC adapter (see “Testing the AC Adapter” on
page 81). If the voltage is correct, replace the
voltage converter.
If any of the measured voltages except +20 V dc is
not correct, replace the following FRUs one at a time
to correct the problem.
1. Voltage converter
2. System board
3. I/O panel assembly
Note: Reconnect the standby-battery connector and the
flexible cable that were removed in Step 5 on
page 85 before leaving this procedure.
86IBM Mobile Systems HMM - Volume 1
Symptom-to-FRU Index
The Symptom-to-FRU Index lists error symptoms and
possible causes. The most likely cause is listed first.
Always begin with “General Checkout” on page 74. This
index also can be used to help you decide which FRUs to
have available when servicing a computer.
If you are unable to correct the problem using this index,
go to “Undetermined Problem” on page 94.
IMPORTANT:
1. If you have both an error message and an incorrect
audio response, diagnose the error message first.
2. If you cannot run the advanced diagnostics tests, but
did receive a POST error message, diagnose the
POST error message.
3. If you did not receive an error message, look for a
description of your error symptoms in the first part of
this index.
4. Check all power supply voltages before you replace
the system board. (See “Power Systems Checkout”
on page 78.)
5. If an error message is not listed, there is a device
installed that requires an additional diskette or service
manual. Refer to the diskette or service manual for
that device.
How to Read POST Error Messages
POST error messages are displayed on the screen as 3, 4,
5, or 8 digits. The error messages that can be displayed
as shorter POST messages are highlighted in this
Symptom-to-FRU Index.
In the following index, an
X
in an error message can be
any number.
Numeric Error Codes
Symptom/ErrorFRU/Action
00010200, 00010300,
00010400, 00010700
00010800 1. System Board
00011000
(See “Memory Checkout” on
page 77 before replacing
any FRUs.)
000113XX 1. System Board
Model N51 (8551)87
1. System Board
2. Communications
Cartridge
1. Memory Module Kit
2. System Board
2. Communications
Cartridge
3. Any Drive
Symptom/ErrorFRU/Action
000114XX 1. Communications
000118XX1. Memory Module Kit
000161001. See “Testing the
00016300, 00016400,
00016500, 00016900
(If setting configuration
does not solve the problem,
see “Checking Installed
Devices” on page 95.)
000166XX 1. Communications
000171XX, 000172XX 1. System Board
000173001. See “Testing the
00017400
(If Automatic Configuration
does not solve the problem,
run Advanced Diagnostics.)
00019000, 000191XX 1. System Board
00019200 1. Lid Switch
00019300 1. System Board
000199XX 1. System Board
0001XXXX
(not listed above)
0002XXXX
(See “Memory Checkout” on
page 77 before replacing
any FRUs.)
00030100, 00030500
(Always power-on the
computer before external
any external device.)
00030200, 00030300,
00030400
Cartridge
Battery Pack” on
page 82.
2. System Board
3. Voltage Converter
1. Set Configuration
2. System Board
3. Communications
Cartridge
4. Hard Disk Drive
5. Memory Module Kit
Cartridge
Battery Pack” on
page 82.
2. System Board
3. Voltage Converter
1. Set Configuration
2. Keyboard Control Card
3. System Board
1. System Board
2. Communications
Cartridge
3. I/O Panel Assembly
1. Memory Module Kit
2. System Board
1. Keyboard Control
Card
2. System Board
3. Keyboard
4. Numeric Keypad
1. System Board
2. Keyboard Control Card
3. Keyboard
or
Numeric Keypad
88IBM Mobile Systems HMM - Volume 1
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