Lenovo THINKPAD MT 8748 User manual

ThinkPad®Reserve Edition
Hardware Maintenance Manual
July 2007
This manual supports:
ThinkPad Reserve Edition
(MT 8748)

ThinkPad®Reserve Edition
Hardware Maintenance Manual

Note
Before using this information and the product it supports, be sure to read the general information under “Notices” on page
113.
First Edition (July 2007)
©Copyright Lenovo 2007. All rights reserved.
LENOVO products, data, computer software, and services have been developed exclusively at private expense and
are sold to governmental entities as commercial items as defined by 48 C.F.R. 2.101 with limited and restricted
rights to use, reproduction and disclosure.
LIMITED AND RESTRICTED RIGHTS NOTICE: If products, data, computer software, or services are delivered
pursuant aGeneral Services Administration ″GSA″contract, use, reproduction, or disclosure is subject to restrictions
set forth in Contract No. GS-35F-05925.

Contents
About this manual ..........1
Introduction .............3
Important service information ........3
Strategy for replacing FRUs .........3
Strategy for replacing ahard disk drive ....4
Important notice for replacing asystem board ..4
How to use error messages ........4
Strategy for replacing FRUs for CTO, CMV, and GAV 4
Product definition ...........4
FRU identification for CTO, CMV, and GAV
products ...............5
Important information about replacing RoHS
compliant FRUs .............6
Diskette compatibility matrix .........7
Safety notices: multilingual translations .....7
Safety information ............13
General safety ............13
Electrical safety ............13
Safety inspection guide .........15
Handling devices that are sensitive to
electrostatic discharge ..........16
Grounding requirements .........16
Laser compliance statement .........17
General descriptions.........19
Read this first .............19
What to do first ............19
Related service information .........21
Service Web site ............21
Restoring the factory contents by using Product
Recovery discs ............21
Passwords ..............22
Power management ..........24
Checkout guide .............27
Testing the computer ..........27
Detecting system information with PC-Doctor ..29
Power system checkout .........30
ThinkPad Reserve Edition ......33
Product overview ............34
Specifications .............34
Status indicators ............36
FRU tests ..............38
Fn key combinations ..........40
Symptom-to-FRU index ..........43
Numeric error codes ..........43
Error messages ............47
Beep symptoms ............48
No-beep symptoms...........48
LCD-related symptoms .........49
Intermittent problems ..........50
Undetermined problems .........50
FRU replacement notices ..........51
Screw notices .............51
Retaining serial numbers .........51
Removing and replacing aFRU........54
1010 Battery pack ...........55
1020 Leaf spring and leaf spring cover ....57
1030 Left bezel and right bezel .......58
1040 Leather front cover, leather cover, and
extended latch knob assembly .......59
1050 Hard disk drive cover, hard disk drive, and
hard disk drive rubber rails ........62
1060 DIMM cover and DIMM .......64
1070 Keyboard ............65
1080 Backup battery ..........68
1090 Keyboard bezel ..........69
1100 Fingerprint reader card and fingerprint FPC 72
1110 PCI Express Mini Card for wireless LAN ..73
1120 PCI Express Mini Card for wireless WAN 75
1130 Modem daughter card (MDC-1.5) ....76
1140 Second fan ............77
1150 DC-in cable assembly and RJ-11 cable
assembly kit .............78
1160 LCD assembly...........79
1170 System board, HDD sub card, fansink, and
PC Card slot assembly..........83
1180 Base cover and speaker........88
2010 LCD front bezel and clear plate .....89
2020 Inverter card ...........91
2030 Bluetooth daughter card (BDC-2) ....92
2040 LCD panel and LCD cable ......93
2050 Wireless WAN antenna cable set, wireless
WAN rod antenna (with special tool and ring),
and aluminum tape for wireless WAN ....95
2060 Wireless LAN antenna ........98
2070 Hinges and LCD rear cover ...... 100
3010 ThinkPad Reserve Edition whole system 102
Locations ............... 103
Front view ............. 103
Bottom view............. 104
Parts list ............... 105
Overall .............. 106
LCD FRUs ............. 109
Keyboard..............110
Recovery discs ............110
Miscellaneous parts .......... 111
AC adapters ............. 111
Common parts list...........112
Notices ...............113
Trademarks ..............114
©Copyright Lenovo 2007 iii

iv MT 8748

About this manual
This manual contains service and reference information for ThinkPad®Reserve
Edition (MT 8748) products. Use this manual along with the advanced diagnostic
tests to troubleshoot problems.
The manual is divided into sections as follows:
vThe common sections provide general information, guidelines, and safety
information required in servicing computers.
vThe product-specific section includes service, reference, and product-specific
parts information.
Important
This manual is intended for trained service personnel who are familiar with
ThinkPad products. Use this manual along with the advanced diagnostic tests
to troubleshoot problems effectively.
Before servicing aThinkPad product, be sure to review the safety information
under “Safety notices: multilingual translations” on page 7, “Safety
information” on page 13, and “Laser compliance statement” on page 17.
©Copyright Lenovo 2007 1

2MT 8748

Introduction
Important service information
Important
BIOS and device driver fixes are customer-installable. The BIOS and device
drivers are posted on the customer support site http://www.lenovo.com/
support
Advise customers to contact the Customer Support Center at 800-426-7378 if
they need assistance in obtaining or installing any software fixes, drivers, and
BIOS downloads.
Customers in Canada should call the Customer Support Center at
800-565-3344 for assistance or download information.
Strategy for replacing FRUs
Before replacing parts
Make sure that all software fixes, drivers, and BIOS downloads are installed
before replacing any FRUs listed in this manual.
After asystem board is replaced, ensure that the latest BIOS is loaded to the
system board before completing the service action.
To download software fixes, drivers, and BIOS, do as follows:
1. Go to http://www.lenovo.com/support
2. Enter the product number of the computer or press Auto-detect button on
the screen.
3. Select Downloads and drivers.
4. Follow the directions on the screen and install the necessary software.
Use the following strategy to prevent unnecessary expense for replacing and
servicing FRUs:
vIf you are instructed to replace aFRU but the replacement does not correct the
problem, reinstall the original FRU before you continue.
vSome computers have both aprocessor board and asystem board. If you are
instructed to replace either the processor board or the system board, and
replacing one of them does not correct the problem, reinstall that board, and
then replace the other one.
vIf an adapter or adevice consists of more than one FRU, any of the FRUs may
be the cause of the error. Before replacing the adapter or device, remove the
FRUs, one by one, to see if the symptoms change. Replace only the FRU that
changed the symptoms.
©Copyright Lenovo 2007 3

Attention: The setup configuration on the computer you are servicing may have
been customized. Running Automatic Configuration may alter the settings. Note
the current configuration settings (using the View Configuration option); then,
when service has been completed, verify that those settings remain in effect.
Strategy for replacing ahard disk drive
Always try to run alow-level format before replacing ahard disk drive. This will
cause all customer data on the hard disk to be lost. Be sure that the customer has a
current backup of the data before doing this task.
Attention: The drive startup sequence in the computer you are servicing may
have been changed. Be extremely careful during write operations such as copying,
saving, or formatting. If you select an incorrect drive, data or programs can be
overwritten.
Important notice for replacing asystem board
Some components mounted on asystem board are very sensitive. Improper
handling of asystem board can cause damage to those components, and may
cause asystem malfunction.
Attention: When handling asystem board:
vDo not drop asystem board or apply any excessive force to it.
vAvoid rough handling of any kind.
vAvoid bending asystem board and hard pushing to prevent cracking at each
BGA (Ball Grid Array) chipset.
How to use error messages
Use the error codes displayed on the screen to diagnose failures. If more than one
error code is displayed, begin the diagnosis with the first error code. Whatever
causes the first error code may also cause false error codes. If no error code is
displayed, see whether the error symptom is listed in the Symptom-to-FRU Index
for the computer you are servicing.
Strategy for replacing FRUs for CTO, CMV, and GAV
Product definition
Dynamic Configure To Order (CTO)
This provides the ability for acustomer to configure an IBM®or aLenovoTM
solution from an eSite, and have this configuration sent to fulfillment, where it is
built and shipped directly to the customer. The machine label, Product Entitlement
Warehouse (PEW), eSupport, and the HMM will load these products as the 4-digit
MT and 3-digit model, where model =“CTO” (Example: 1829-CTO).
Custom Model Variant (CMV)
This is aunique configuration that has been negotiated between IBM or Lenovo
and the customer. Aunique 4-digit MT and 3-digit model is provided to the
customer to place orders (Example: 1829-W15). ACMV is aspecial bid offering.
Therefore, it is NOT generally announced.
vThe MTM portion of the machine label is the 4-digit MT and 3-digit model,
where model =“CTO” (Example: 1829-CTO). The PRODUCT ID portion of the
machine label is the 4-digit MT and 3-digit CMV model (Example: 1829-W15).
Important service information
4MT 8748

vThe PEW record is the 4-digit MT and 3-digit model, where model =“CTO”
(Example: 1829-CTO).
veSupport will show both the CTO and CMV machine type models (Example:
1829-CTO and 1829-W15 will be found on the eSupport site.)
vThe HMM will have the 4-digit MT and 3-digit CTO model only (Example:
1829-CTO). Again, CMVs are custom models and are not found in the HMM.
General Announce Variant (GAV)
This is astandard model (fixed configuration). GAVs are announced and offered to
all customers. The MTM portion of the machine label is a4-digit MT and 3-digit
model, where model =a“fixed part number”, not “CTO” (Example: 1829-F1U).
Also, PEW, eSupport, and the HMM will list these products under the same fixed
model number.
FRU identification for CTO, CMV, and GAV products
There are three information resources to identify which FRUs are used to support
CTO, CMV, and GAV products. These sources are PEW, eSupport, and the HMM.
Using PEW
vPEW is the primary source for identifying FRU part numbers and FRU
descriptions for the key commodities for CTO, CMV and GAV products at aMT
-serial number level. An example of key commodities are hard disk drives,
system boards, microprocessors, Liquid Crystal Displays (LCDs), and memory.
vRemember, all CTO and CMV products are loaded in PEW under the 4-digit MT
and 3-digit model, where model =“CTO” (Example: 1829-CTO). GAVs are
loaded in PEW under the 4-digit MT and 3-digit model, where model =a“fixed
part number”, not “CTO” (Example: 1829-F1U).
vPEW can be accessed at the following Web site:
http://w3-3.ibm.com/pc/entitle
Customers can also access PEW via
http://www-307.ibm.com/pc/support/site.wss/product.do?template=/
warranty/warranty.vm&sitestyle=lenovo
Select Warranty lookup. Input the MT and the Serial number and the list of key
commodities will be returned in the PEW record under COMPONENT
INFORMATION.
vBusiness Partners using Eclaim will access PEW when performing Entitlement
Lookup. Business Partners will enter Loc ID, MT and Serial, and the key
commodities will be returned in the Eclaim record under SYSTEM DETAILS.
vAuthorized IBM Business Partners can access Eclaim at the following Web site:
https://wca.eclaim.com
Using eSupport
For Key Commodities (Examples -hard disk drive, system board,
microprocessor, LCD, and memory)
veSupport can be used to view the list of key commodities built in aparticular
machine serial (this is the same record found in PEW).
veSupport can be accessed at the following Web site: http://www.lenovo.com/
support
vTo view the key commodities, click on PARTS INFORMATION, then PARTS
LOOKUP. Type in the model type and serial number. The key commodities will
be returned in the eSupport record under PARTS SHIPPED WITH YOUR
SYSTEM.
Important service information
Introduction 5

For the Remaining FRUs (the complete list of FRUs at the MT Model level)
veSupport can be used to view the complete list of FRUs for amachine type and
model.
vTo view the complete list of FRUs, type in the machine type and model
(Example: 1829-CTO) under QUICK PATH. Under “View by Document Type”
select PARTS INFORMATION. Under “Filter by Category” select SERVICE
PARTS. Under “Parts Information by Date” select SYSTEM SERVICE PARTS. The
list of service parts by description, with applicable machine type model and FRU
will be displayed.
Using the HMM
Use the HMM as aback-up to PEW and eSupport to view the complete list of
FRUs at the MT Model level.
Important information about replacing RoHS compliant FRUs
RoHS, The Restriction of Hazardous Substances in Electrical and Electronic
Equipment Directive (2002/95/EC) is aEuropean Union legal requirement
affecting the global electronics industry. RoHS requirements must be
implemented on Lenovo products placed on the market and sold in the
European Union after June 2006. Products on the market before June 2006 are
not required to have RoHS compliant parts. If the original FRU parts are non
compliant, replacement parts can also be non compliant. In all cases if the
original FRU parts are RoHS compliant the replacement part must also be RoHS
compliant.
Note: RoHS and non-RoHS FRU part numbers with the same fit and function are
identified with unique FRU part numbers.
Lenovo plans to transition to RoHS compliance well before the implementation
date and expects its suppliers to be ready to support Lenovo's requirements and
schedule in the EU. Products sold in 2005 and 2006, will contain some RoHS
compliant FRUs. The following statement pertains to these products and any
product Lenovo produces containing RoHS compliant FRUs.
RoHS compliant FRUs have unique FRU part numbers. Before or after the RoHS
implementation date, failed RoHS compliant parts must always be replaced using
RoHS compliant FRUs, so only the FRUs identified as compliant in the system
HMM or direct substitutions for those FRUs may be used.
Products marketed before June 2006 Products marketed after June 2006
Current or original
part
Replacement FRU Current or original
part
Replacement FRU
Non-RoHS Can be Non-RoHS Must be RoHS Must be RoHS
Non-RoHS Can be RoHS
Non-RoHS Can sub to RoHS
RoHS Must be RoHS
Note: Adirect substitution is apart with adifferent FRU part number that is
automatically shipped by the distribution center at the time of the order.
Important service information
6MT 8748

Diskette compatibility matrix
The compatibility of each of the drives with the diskettes for it is as follows:
Diskette
drive
Diskette
capacity
Compatibility
3.5-inch 1.0 MB Read and write
2.0 MB Read and write
4.0 MB Not compatible
Safety notices: multilingual translations
In this manual, safety notices appear in English with apage number reference to
the appropriate multilingual, translated safety notice found in this section.
The following safety notices are provided in English, French, German, Hebrew,
Italian, and Spanish.
Safety notice 1
Before the computer is powered on after FRU replacement, make sure all screws, springs,
and other small parts are in place and are not left loose inside the computer. Verify this
by shaking the computer and listening for rattling sounds. Metallic parts or metal flakes
can cause electrical shorts.
Avant de remettre l’ordinateur sous tension après remplacement d’une unité en clientèle,
vérifiez que tous les ressorts, vis et autres pièces sont bien en place et bien fixées. Pour
ce faire, secouez l’unité et assurez-vous qu’aucun bruit suspect ne se produit. Des pièces
métalliques ou des copeaux de métal pourraient causer un court-circuit.
Bevor nach einem FRU-Austausch der Computer wieder angeschlossen wird, muß
sichergestellt werden, daß keine Schrauben, Federn oder andere Kleinteile fehlen oder im
Gehäuse vergessen wurden. Der Computer muß geschüttelt und auf Klappergeräusche
geprüft werden. Metallteile oder-splitter können Kurzschlüsse erzeugen.
Prima di accendere l’elaboratore dopo che éstata effettuata la sostituzione di una FRU,
accertarsi che tutte le viti, le molle etutte le altri parti di piccole dimensioni siano nella
corretta posizione enon siano sparse all’interno dell’elaboratore. Verificare ciò scuotendo
l’elaboratore eprestando attenzione ad eventuali rumori; eventuali parti opezzetti
metallici possono provocare cortocircuiti pericolosi.
Antes de encender el sistema despues de sustituir una FRU, compruebe que todos los
tornillos, muelles ydemás piezas pequeñas se encuentran en su sitio yno se encuentran
sueltas dentro del sistema. Compruébelo agitando el sistema yescuchando los posibles
ruidos que provocarían. Las piezas metálicas pueden causar cortocircuitos eléctricos.
Diskette compatibility matrix
Introduction 7

Safety notice 2
DANGER
Some standby batteries contain asmall amount of nickel and cadmium. Do not
disassemble astandby battery, recharge it, throw it into fire or water, or short-circuit it.
Dispose of the battery as required by local ordinances or regulations. Use only the
battery in the appropriate parts listing. Use of an incorrect battery can result in
ignition or explosion of the battery.
Certaines batteries de secours contiennent du nickel et du cadmium. Ne les démontez
pas, ne les rechargez pas, ne les exposez ni au feu ni àl’eau. Ne les mettez pas en
court-circuit. Pour les mettre au rebut, conformez-vous àla réglementation en vigueur.
Lorsque vous remplacez la pile de sauvegarde ou celle de l’horloge temps réel, veillez
àn’utiliser que les modèles cités dans la liste de pièces détachées adéquate. Une
batterie ou une pile inappropriée risque de prendre feu ou d’exploser.
Die Bereitschaftsbatterie, die sich unter dem Diskettenlaufwerk befindet, kann
geringe Mengen Nickel und Cadmium enthalten. Sie darf nur durch die Verkaufsstelle
oder den IBM Kundendienst ausgetauscht werden. Sie darf nicht zerlegt,
wiederaufgeladen, kurzgeschlossen, oder Feuer oder Wasser ausgesetzt werden. Die
Batterie kann schwere Verbrennungen oder Verätzungen verursachen. Bei der
Entsorgung die örtlichen Bestimmungen für Sondermüll beachten. Beim Ersetzen der
Bereitschafts-oder Systembatterie nur Batterien des Typs verwenden, der in der
Ersatzteilliste aufgeführt ist. Der Einsatz falscher Batterien kann zu Entzündung oder
Explosion führen.
Alcune batterie di riserva contengono una piccola quantità di nichel ecadmio. Non
smontarle, ricaricarle, gettarle nel fuoco onell’acqua né cortocircuitarle. Smaltirle
secondo la normativa in vigore (DPR 915/82, successive disposizioni edisposizioni
locali). Quando si sostituisce la batteria dell’RTC (real time clock) ola batteria di
supporto, utilizzare soltanto itipi inseriti nell’appropriato Catalogo parti. L’impiego di
una batteria non adatta potrebbe determinare l’incendio ol’esplosione della batteria
stessa.
Algunas baterías de reserva contienen una pequeña cantidad de níquel ycadmio. No
las desmonte, ni recargue, ni las eche al fuego oal agua ni las cortocircuite.
Deséchelas tal como dispone la normativa local. Utilice sólo baterías que se
encuentren en la lista de piezas. La utilización de una batería no apropiada puede
provocar la ignición oexplosión de la misma.
Safety notices
8MT 8748

Safety notice 3
DANGER
The battery pack contains small amounts of nickel. Do not disassemble it, throw it
into fire or water, or short-circuit it. Dispose of the battery pack as required by local
ordinances or regulations. Use only the battery in the appropriate parts listing when
replacing the battery pack. Use of an incorrect battery can result in ignition or
explosion of the battery.
La batterie contient du nickel. Ne la démontez pas, ne l’exposez ni au feu ni àl’eau.
Ne la mettez pas en court-circuit. Pour la mettre au rebut, conformez-vous àla
réglementation en vigueur. Lorsque vous remplacez la batterie, veillez àn’utiliser que
les modèles cités dans la liste de pièces détachées adéquate. En effet, une batterie
inappropriée risque de prendre feu ou d’exploser.
Akkus enthalten geringe Mengen von Nickel. Sie dürfen nicht zerlegt,
wiederaufgeladen, kurzgeschlossen, oder Feuer oder Wasser ausgesetzt werden. Bei
der Entsorgung die örtlichen Bestimmungen für Sondermüll beachten. Beim Ersetzen
der Batterie nur Batterien des Typs verwenden, der in der Ersatzteilliste aufgeführt ist.
Der Einsatz falscher Batterien kann zu Entzündung oder Explosion führen.
La batteria contiene piccole quantità di nichel. Non smontarla, gettarla nel fuoco o
nell’acqua né cortocircuitarla. Smaltirla secondo la normativa in vigore (DPR 915/82,
successive disposizioni edisposizioni locali). Quando si sostituisce la batteria,
utilizzare soltanto itipi inseriti nell’appropriato Catalogo parti. L’impiego di una
batteria non adatta potrebbe determinare l’incendio ol’esplosione della batteria stessa.
Las baterías contienen pequeñas cantidades de níquel. No las desmonte, ni recargue,
ni las eche al fuego oal agua ni las cortocircuite. Deséchelas tal como dispone la
normativa local. Utilice sólo baterías que se encuentren en la lista de piezas al
sustituir la batería. La utilización de una batería no apropiada puede provocar la
ignición oexplosión de la misma.
Safety notices
Introduction 9

Safety notice 4
DANGER
The lithium battery can cause afire, an explosion, or asevere burn. Do not recharge it,
remove its polarized connector, disassemble it, heat it above 100°C (212°F), incinerate
it, or expose its cell contents to water. Dispose of the battery as required by local
ordinances or regulations. Use only the battery in the appropriate parts listing. Use of
an incorrect battery can result in ignition or explosion of the battery.
La pile de sauvegarde contient du lithium. Elle présente des risques d’incendie,
d’explosion ou de brûlures graves. Ne la rechargez pas, ne retirez pas son connecteur
polarisé et ne la démontez pas. Ne l’exposez pas àune temperature supérieure à100°C,
ne la faites pas brûler et n’en exposez pas le contenu àl’eau. Mettez la pile au rebut
conformément àla réglementation en vigueur. Une pile inappropriée risque de
prendre feu ou d’exploser.
Die Systembatterie ist eine Lithiumbatterie. Sie kann sich entzünden, explodieren
oder schwere Verbrennungen hervorrufen. Batterien dieses Typs dürfen nicht
aufgeladen, zerlegt, über 100 Cerhitzt oder verbrannt werden. Auch darf ihr Inhalt
nicht mit Wasser in Verbindung gebracht oder der zur richtigen Polung angebrachte
Verbindungsstecker entfernt werden. Bei der Entsorgung die örtlichen Bestimmungen
für Sondermüll beachten. Beim Ersetzen der Batterie nur Batterien des Typs
verwenden, der in der Ersatzteilliste aufgeführt ist. Der Einsatz falscher Batterien
kann zu Entzündung oder Explosion führen.
La batteria di supporto euna batteria al litio epuo incendiarsi, esplodere oprocurare
gravi ustioni. Evitare di ricaricarla, smontarne il connettore polarizzato, smontarla,
riscaldarla ad una temperatura superiore ai 100 gradi centigradi, incendiarla ogettarla
in acqua. Smaltirla secondo la normativa in vigore (DPR 915/82, successive
disposizioni edisposizioni locali). L’impiego di una batteria non adatta potrebbe
determinare l’incendio ol’esplosione della batteria stessa.
La batería de repuesto es una batería de litio ypuede provocar incendios, explosiones
oquemaduras graves. No la recargue, ni quite el conector polarizado, ni la desmonte,
ni caliente por encima de los 100°C (212°F), ni la incinere ni exponga el contenido de
sus celdas al agua. Deséchela tal como dispone la normativa local.
Safety notices
10 MT 8748

Safety notice 5
Safety notice 6
DANGER
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 àcristaux liquides se brise et que vous recevez dans les yeux
ou sur les mains une partie du fluide, rincez-les abondamment pendant au moins quinze
minutes. Consultez un médecin si des symptômes persistent après le lavage.
Die Leuchtstoffröhre im LCD-Bildschirm enthält Quecksilber. Bei der Entsorgung die
örtlichen Bestimmungen für Sondermüll beachten. Der LCD-Bildschirm besteht aus Glas
und kann zerbrechen, wenn er unsachgemäß behandelt wird oder der Computer auf den
Boden fällt. Wenn der Bildschirm beschädigt ist und die darin befindliche Flüssigkeit in
Kontakt mit Haut und Augen gerät, sollten die betroffenen Stellen mindestens 15
Minuten mit Wasser abgespült und bei Beschwerden anschließend ein Arzt aufgesucht
werden.
Nel caso che caso l’LCD si dovesse rompere ed il liquido in esso contenuto entrasse in
contatto con gli occhi ole mani, lavare immediatamente le parti interessate con acqua
corrente per almeno 15 minuti; poi consultare un medico se isintomi dovessero
permanere.
Si la LCD se rompe yel fluido de su interior entra en contacto con sus ojos osus manos,
lave inmediatamente las áreas afectadas con agua durante 15 minutos como mínimo.
Obtenga atención medica si se presenta algún síntoma del fluido despues de lavarse.
To avoid shock, do not remove the plastic cover that protects the lower part of the
inverter card.
Afin d’éviter tout risque de choc électrique, ne retirez pas le cache en plastique
protégeant la partie inférieure de la carte d’alimentation.
Aus Sicherheitsgründen die Kunststoffabdeckung, die den unteren Teil der
Spannungswandlerplatine umgibt, nicht entfernen.
Per evitare scosse elettriche, non rimuovere la copertura in plastica che avvolge la
parte inferiore della scheda invertitore.
Para evitar descargas, no quite la cubierta de plástico que rodea la parte baja de la
tarjeta invertida.
Safety notices
Introduction 11

Safety notice 7
DANGER
Safety notice 8
DANGER
Though the main batteries have low voltage, ashorted or grounded battery can
produce enough current to burn personnel or combustible materials.
Bien que le voltage des batteries principales soit peu élevé, le court-circuit ou la mise
àla masse d’une batterie peut produire suffisamment de courant pour brûler des
matériaux combustibles ou causer des brûlures corporelles graves.
Obwohl Hauptbatterien eine niedrige Spannung haben, können sie doch bei
Kurzschluß oder Erdung genug Strom abgeben, um brennbare Materialien zu
entzünden oder Verletzungen bei Personen hervorzurufen.
Sebbene le batterie di alimentazione siano abasso voltaggio, una batteria in corto
circuito oamassa 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 atierra puede producir la corriente suficiente como para quemar material
combustible oprovocar quemaduras en el personal.
Before removing any FRU, power off the computer, unplug all power cords from
electrical outlets, remove the battery pack, and then disconnect any interconnecting
cables.
Avant de retirer une unité remplaçable en clientèle, mettez le système hors tension,
débranchez tous les cordons d’alimentation des socles de prise de courant, retirez la
batterie et déconnectez tous les cordons d’interface.
Die Stromzufuhr muß abgeschaltet, alle Stromkabel aus der Steckdose gezogen, der
Akku entfernt und alle Verbindungskabel abgenommen sein, bevor eine FRU entfernt
wird.
Prima di rimuovere qualsiasi FRU, spegnere il sistema, scollegare dalle prese elettriche
tutti icavi di alimentazione, rimuovere la batteria epoi scollegare icavi di
interconnessione.
Antes de quitar una FRU, apague el sistema, desenchufe todos los cables de las tomas
de corriente eléctrica, quite la batería y, acontinuación, desconecte cualquier cable de
conexión entre dispositivos.
Safety notices
12 MT 8748

Safety information
The following section presents safety information with which you need to be
familiar before you service aThinkPad computer.
General safety
Follow these rules to ensure general safety:
vObserve good housekeeping in the area of the machines during and after
maintenance.
vWhen lifting any heavy object:
1. Make sure that you can stand safely without slipping.
2. Distribute the weight of the object equally between your feet.
3. Use aslow lifting force. Never move suddenly or twist when you attempt to
lift.
4. Lift by standing or by pushing up with your leg muscles; this action removes
the strain from the muscles in your back. Do not attempt to lift any object that
weighs more than 16 kg (35 lb) or that you think is too heavy for you.
v
Do not perform any action that causes hazards to the customer, or that makes
the equipment unsafe.
vBefore you start the machine, make sure that other service representatives and
the customer’s personnel are not in ahazardous position.
vPlace removed covers and other parts in asafe place, away from all personnel,
while you are servicing the machine.
vKeep your toolcase away from walk areas so that other people will not trip over
it.
vDo not wear loose clothing that can be trapped in the moving parts of a
machine. Make sure that your sleeves are fastened or rolled up above your
elbows. If your hair is long, fasten it.
vInsert the ends of your necktie or scarf inside clothing or fasten it with a
nonconductive clip, about 8centimeters (3 inches) from the end.
vDo not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your
clothing.
Attention: Metal objects are good electrical conductors.
vWear safety glasses when you are hammering, drilling, soldering, cutting wire,
attaching springs, using solvents, or working in any other conditions that might
be hazardous to your eyes.
vAfter service, reinstall all safety shields, guards, labels, and ground wires.
Replace any safety device that is worn or defective.
vReinstall all covers correctly before returning the machine to the customer.
vFan louvers on the machine help to prevent overheating of internal components.
Do not obstruct fan louvers or cover them with labels or stickers.
Electrical safety
Observe the following rules when working on electrical equipment.
Safety information
Introduction 13

Important
Use only approved tools and test equipment. Some hand tools have handles
covered with asoft 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.
vFind 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.
vDo not work alone under hazardous conditions or near equipment that has
hazardous voltages.
vDisconnect all power before:
–Performing amechanical inspection
–Working near power supplies
–Removing or installing Field Replaceable Units (FRUs)
v
Before you start to work on the machine, unplug the power cord. If you cannot
unplug it, ask the customer to power-off the wall box that supplies power to the
machine, and to lock the wall box in the off position.
vIf you need to work on amachine that has exposed electrical circuits, observe the
following precautions:
–Ensure that another person, familiar with the power-off controls, is near you.
Attention: Another person must be there to switch off the power, if
necessary.
–Use only one hand when working with powered-on electrical equipment;
keep the other hand in your pocket or behind your back.
Attention: An electrical shock can occur only when there is acomplete
circuit. By observing the above rule, you may prevent acurrent from passing
through your body.
–When using testers, set the controls correctly and use the approved probe
leads and accessories for that tester.
–Stand on suitable rubber mats (obtained locally, if necessary) to insulate you
from grounds such as metal floor strips and machine frames.
Observe the special safety precautions when you work with very high voltages;
Instructions for these precautions are in the safety sections of maintenance
information. Use extreme care when measuring high voltages.
vRegularly inspect and maintain your electrical hand tools for safe operational
condition.
vDo not use worn or broken tools and testers.
vNever assume that power has been disconnected from acircuit. First, check that it
has been powered off.
vAlways 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.
vDo not touch live electrical circuits with the reflective surface of aplastic dental
mirror. The surface is conductive; such touching can cause personal injury and
machine damage.
Safety information
14 MT 8748