IBM Aptiva 2161 User manual

2161
Hardware Maintenance Service
for Service Level A
Machine Type 2161
and IBM Monitors

2161
Hardware Maintenance Service
for Service Level A
Machine Type 2161
and IBM Monitors

First Edition (January 1997)
The following paragraph does not apply to any state or 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. References to IBM products, programs,
or services do not imply that IBM intends to make them available outside the United
States.
This publication could include technical inaccuracies or typographical errors. Changes
are periodically made to the information herein; these changes will be made in later
editions. IBM may make improvements and/or changes in the product(s) and/or the
program(s) at any time.
For copies of publications related to this product, call toll free 1-800-IBM-7282 in the
Continental U.S.A. In Alaska, call 1-414-633-8108. In Canada, call toll free
1-800-465-7999. In British Columbia, call toll free 112-800-465-1234.
 Copyright International Business Machines Corporation 1997. 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.

Contents
Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Voltage Supply Switch Settings .................... vii
Positionnement du sélecteur de tension ............... viii
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Safety Notices (Multi-Lingual Translations) .............. x
Laser Compliance Statement ....................... xiv
Federal Communications Commission (FCC) Notice ........ xvii
Canadian Department of Communications Compliance Statement . xviii
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxiii
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Chapter Description . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Diagnostic Information . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Diagnostic Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Repair Information . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Parts/Test Point Locations ..................... 1-4
Safety Inspection Guide ....................... 1-4
Parts Catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Part Number Index ......................... 1-5
Appendix: Model Configurations and FRU Part Numbers ..... 1-5
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Hardware Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Refresh Rates and Monitor Frequencies .............. 1-11
Power-On Password, CMOS Reset .................. 1-12
Flash (BIOS) Update Procedure .................... 1-13
Setup Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Using the Setup Utility ........................ 1-14
Making Changes with the Setup Utility ............... 1-16
Using Rapid Resume Manager ..................... 1-22
Rapid Resume Manager Features ................. 1-22
Rapid Resume Connectors ..................... 1-23
POST Error History ........................... 1-24
System Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
DIMM Identification . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
Operating Requirements . . . . . . . . . . . . . . . . . . . . . . . . 1-28
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
Check Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
 Copyright IBM Corp. 1997 iii

Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Index of Symptoms, Messages, Error Codes, or Beeps ........ 2-9
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35
Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37
Mouse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39
Diagnostics and Utilities Device Presence Test ............ 2-40
Factory-Installed Drive Devices .................... 2-43
Diagnostics for Factory-Installed Drive Devices ............ 2-46
Diagnostics for Factory-Installed Riser Card and Sound Card ..... 2-49
33.6 Kbps DSVD Factory-Installed Modem Adapter .......... 2-55
Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-59
Undetermined Problem . . . . . . . . . . . . . . . . . . . . . . . . . 2-63
Diagnostic Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Power-On Self Test ........................... 3-2
Diagnostics and Utilities CD ...................... 3-3
Creating a Diagnostics Bootable Diskette ............... 3-4
Diagnostic Test Programs ....................... 3-6
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Return Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Using the Advanced Diagnostic Test Programs ............ 3-8
Program Navigation . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Viewing the Test Groups ...................... 3-10
Scripting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Changing Logical Unit Numbers ................... 3-11
Test Group Specifications ...................... 3-11
Stopping the Tests ......................... 3-13
Formatting Diskettes . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Hard Disk Drive Boot Error ..................... 3-14
File Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
File Edit Function Key Usage .................... 3-14
Diagnostics Control Keys ...................... 3-16
Display Self Test ............................ 3-17
Repair Information . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Removals and Replacements—Machine Type 2161 .......... 4-2
2005—Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
2020—3.5-In. Bays . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
2025—5.25-In. Bays . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
2030—Hard Disk Drives ....................... 4-7
2035—Adapter Cards . . . . . . . . . . . . . . . . . . . . . . . . 4-9
2040—Power Supply . . . . . . . . . . . . . . . . . . . . . . . . 4-10
iv Machine Type 2161 - Service Level A Aptiva HMS

2045—Riser Card . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
2050—Memory (DIMM) . . . . . . . . . . . . . . . . . . . . . . . 4-12
2055—Cache Memory . . . . . . . . . . . . . . . . . . . . . . . . 4-13
2060—Processor Removal . . . . . . . . . . . . . . . . . . . . . 4-14
2080—Lithium Battery . . . . . . . . . . . . . . . . . . . . . . . . 4-15
2085—Indicator LED and Cable ................... 4-16
2090—System Board . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Handling ESD-Sensitive Parts ..................... 4-18
Home Director . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Software Installation Procedure .................... 4-23
Parts/Test Point Locations ...................... 5-1
System Board Layout .......................... 5-2
System Board Locations ...................... 5-3
System Bus Clock .......................... 5-4
Processor Speed . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Core/Bus Frequency Ratio Settings ................. 5-5
Power Supply Cable Connector Specifications ............. 5-6
Sound Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Modem Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Hard Disk Drive Jumper Settings .................... 5-10
CD-ROM Drive Jumper Settings .................... 5-13
Zip Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
Detachable Monitor I/O Signal Cable Connector Test Points ..... 5-15
System Board Connector Specifications ................ 5-16
Safety Inspection Guide ....................... 6-1
Parts Catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Assemblies (Service Level A) ..................... 7-2
Catalog Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Assembly 1: Machine Type 2161 System Unit - Exterior (SL-A) .. 7-3
Assembly 2: Machine Type 2161 System Unit - Interior (SL-A) .. 7-4
Assembly 3: Diskette, Hard Disk Drives, and Internal Zip Drive .. 7-7
Assembly 4: CD-ROM Drive, Sound and Modem Cards ...... 7-9
Assembly 5: Monitor and Power Cord (Linecord) ......... 7-12
Assembly 6: Keyboard and Mouse ................. 7-15
Assembly 7: Software . . . . . . . . . . . . . . . . . . . . . . . 7-17
Part Number Index .......................... 8-1
Appendix A. Online Support Information .............. A-1
Appendix B. Model/Monitor Configurations and FRU Part Numbers B-1
Contents v

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-1
vi Machine Type 2161 - Service Level A Aptiva HMS

Notices
References in this publication to IBM products, programs, or services do not
imply that IBM intends to make these available in all countries in which IBM
operates. Any reference to an IBM product, program, or service is not
intended to state or imply that only IBM’s product, program, or service may
be used. Any functionally equivalent product, program, or service that does
not infringe any of IBM’s intellectual property rights or other legally
protectable rights may be used instead of the IBM product, program, or
service. Evaluation and verification of operation in conjunction with other
products, programs, or services, except those expressly designated by IBM,
are the user’s responsibility.
IBM may have patents or pending patent applications covering subject
matter in this document. The furnishing of this document does not give you
any license to these patents. You can send license inquiries, in writing, to
the IBM Director of Commercial Relations, IBM Corporation, Purchase, NY
10577.
Voltage Supply Switch Settings
Your IBM Aptiva Personal Computer might have voltage switches, which
must be set correctly for your voltage supply. If your monitor or system unit
has a voltage switch, complete these steps to make sure each switch is set
correctly:
1. Determine the correct voltage switch setting for your area:
2. Locate the voltage switch on the back of your monitor or system unit. If
the setting shown on the switch is:
Correct, start setting up your IBM Aptiva computer.
Incorrect, change the voltage switch setting. (You may need a
small screwdriver.)
Voltage Supply
Range Voltage Switch Setting
100–127 V 115 V or 115
200–240 V 230 V or 230
 Copyright IBM Corp. 1997 vii

Positionnement du sélecteur de tension
Votre Aptiva IBM peut comporter des sélecteurs de tension qui doivent être
positionnés correctement en fonction de la tension adéquate. Si votre écran
ou votre unité centrale sont équipés d’un sélecteur de tension, vérifiez-en le
positionnement en procédant de la manière suivante :
1. Le tableau ci-dessous permet de déterminer le positionnement correct
du ou des sélecteurs de tension :
2. Repérez le ou les sélecteurs de tension situés à l’arrière de votre écran
ou de votre unité centrale. S’ils sont positionnés de façon :
Correcte, démarrez la configuration de votre Aptiva IBM.
Incorrecte, modifiez leur position. (Vous pouvez vous aider d’un
petit tournevis.)
Tensions Positionnement du sélecteur de tension
100–127 V 115 V ou 115
200–240 V 230 V ou 230
viii Machine Type 2161 - Service Level A Aptiva HMS

Safety Information
The construction of the IBM Aptiva Personal Computer provides extra
protection against the risk of electrical shock. This computer has a power
cord with a three-prong plug that is required to ground metal parts. It is the
responsibility of the person installing the computer to connect it to a properly
grounded electrical outlet. Seek professional assistance before using an
adapter or extension cord; these devices could interrupt the grounding
circuit.
If the computer is connected to an electrical outlet that is incorrectly
connected to the building wiring, serious electrical shock could result.
For continued protection against the risk of electrical shock:
Connect your computer only to an electrical outlet of the correct voltage.
If you are unsure about the voltage of the electrical outlet you are using,
contact your local power company.
If your computer has cables other than the power cords, you must
connect them before plugging the power cord into an electrical outlet.
Before removing these cables, you must first unplug the power cords
from the outlet.
If your computer has a telephone connection, do not touch the
telephone cords when there is lightning in the area.
Do not use or store the computer in an area where it can become wet.
Make sure all replacement parts have characteristics identical or
equivalent to the original parts. Other parts may not have the same
safety features.
Personal injury or electrical shock may result if you undertake actions
other than those specifically described in this book. This is particularly
true if you try to service or repair the power supply, monitor, or built-in
modem. Always refer service or repairs to qualified service personnel.
Notices ix

Safety Notices (Multi-Lingual Translations)
The safety notices in this section are provided in the following languages:
English
Brazilian/Portuguese
Chinese
French
German
Hungarian
Italian
Russian
Slovakian
Spanish
xMachine Type 2161 - Service Level A Aptiva HMS

Safety Notice 1
Before removing any FRU, power-off the computer, unplug all power
cords from electrical outlets, then disconnect any interconnecting cables.
Antes de remover qualquer unidade substituível no local (Field
Replaceable Unit - FRU), desligue o computador, retire todos os cabos
de alimentação das respectivas tomadas eléctricas, remremova a pilha
(se instalada) e, em seguida, desconecte todos os cabos de interligação.
FRU
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.
A helyszínen cserélhetõ egységek eltávolítása elõtt
kapcsolja ki a számítógépet, húzza ki a konnektorból
a hálózati csatlakozót, majd távolítsa el az összekötõ
kábeleket is.
Prima di rimuovere qualsiasi FRU, spegnere il sistema, scollegare dalle
prese elettriche tutti i cavi di alimentazione, rimuovere la batteria e poi
scollegare i cavi di interconnessione.
Antes de quitar una FRU, apague el sistema, desenchufe todos los
cables de las tomas de corriente eléctrica, quite la batería y, a
continuación, desconecte cualquier cable de conexión entre dispositivos.
Notices xi

Safety Notice 2
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°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.
A pilha de lítio representa risco de incêndio, explosão ou queimaduras
graves. Não recarregue, desmonte ou exponha a pilha a temperaturas
superiores a 100°C (212°F), não a incinere ou ponha o conteúdo da
respectiva célula em contacto com a água nem remova o respectivo
conector polarizado. Destrua a pilha de acordo com as normas ou
regulamentações locais. Utilize apenas a pilha com o "part-number"
indicado nas listas apropriadas. A utilização de uma pilha incorrecta
pode resultar na igniçãou explosão da mesma.
100 C (212 F)
Elle présente des risques d'incendie, d'explosion ou de brûlures graves.
Ne la rechargez pas, ne retirez pas son connecteur polarisé et ne la
démontez pas. Ne l'exposez pas à une temperature supérieure à
100°C, ne la faites pas brûler et n'en exposez pas le contenu à l'eau.
Mettez la pile au rebut conformément à la réglementation en vigueur.
Une pile inappropriée risque de prendre feu ou d'exploser.
Die Systembatterie ist eine Lithiumbatterie. Sie kann sich entzünden,
explodieren oder schwere Verbrennungen hervorrufen. Batterien dieses
Typs dürfen nicht aufgeladen, zerlegt, über 100 C erhitzt oder verbrannt
werden. Auch darf ihr Inhalt nicht mit Wasser in Verbindung gebracht
oder der zur richtigen Polung angebrachte Verbindungsstecker entfernt
werden. Bei der Entsorgung die örtlichen Bestimmungen für Sondermüll
beachten. Beim Ersetzen der Batterie nur Batterien des Typs
verwenden, der in der Ersatzteilliste aufgeführt ist. Der Einsatz falscher
Batterien kann zu Entzündung oder Explosion führen.
xii Machine Type 2161 - Service Level A Aptiva HMS

Safety Notice 2 Continued
A lítiumelemek meggyulladhatnak, tûz- és robbanás-
veszélyesek. Ezért ne próbálkozzon az elemek újra-
töltésével, a csatlakozók eltávolításával, ne kísérle-
tezzen a széjjelszedésükkel ! Óvja õket a 100°C (212°F)
fölötti hõmérséklettõl, ne dobja õket tûzbe, és vigyázzon,
hogy az elemek cellái ne érintkezhessenek vízzel !
A használt elemeket a helyi hatósági rendelkezéseknek
megfelelõen kezelje.
La batteria di supporto e una batteria al litio e puo incendiarsi, esplodere
o procurare gravi ustioni. Evitare di ricaricarla, smontarne il connettore
polarizzato, smontarla, riscaldarla ad una temperatura superiore ai 100
gradi centigradi, incendiarla o gettarla in acqua. Smaltirla secondo la
normativa in vigore (DPR 915/82, successive disposizioni e disposizioni
locali). L'impiego di una batteria non adatta potrebbe determinare
l'incendio o l'esplosione della batteria stessa.
La 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 100°C
(212°F), ni la incinere ni exponga el contenido de sus celdas al agua.
Deséchela tal como dispone la normativa local.
Notices xiii

Laser Compliance Statement
Some IBM Personal Computer models are equipped from the factory with a
CD-ROM drive. CD-ROM drives are also sold separately as options. The
CD-ROM drive is a laser product. The CD-ROM drive is certified in the U.S.
to conform to the requirements of the Department of Health and Human
Services 21 Code of Federal Regulations (DHHS 21 CFR) Subchapter J for
Class 1 laser products. Elsewhere, the drive is certified to conform to the
requirements of the International Electrotechnical Commission (IEC) 825 and
CENELEC EN 60 825 for Class 1 laser products.
When a CD-ROM drive is installed, note the following.
CAUTION:
Use of controls or adjustments or performance of procedures other
than those specified herein might result in hazardous radiation
exposure.
O uso de controles, ajustes ou desempenho de procedimentos
diferentes daqueles aqui especificados pode resultar em perigosa
exposição à radiação.
Pour éviter tout risque d'exposition au rayon laser, respectez les
consignes de réglage et d'utilisation des commandes, ainsi que les
procédures décrites.
Werden Steuer- und Einstellelemente anders als hier festgesetzt
verwendet, kann gefährliche Laserstrahlung auftreten.
L'utilizzo di controlli, regolazioni o l'esecuzione di procedure diverse da
quelle specificate possono provocare l'esposizione a
xiv Machine Type 2161 - Service Level A Aptiva HMS

El uso de controles o ajustes o la ejecución de procedimientos
distintos de los aquí especificados puede provocar la exposición a
radiaciones peligrosas.
Opening the CD-ROM drive could result in exposure to hazardous laser
radiation. There are no serviceable parts inside the CD-ROM drive. Do not
open.
Some CD-ROM drives contain an embedded Class 3A or Class 3B laser
diode. Note the following.
DANGER:
Laser radiation when open. Do not stare into the beam, do not view
directly with optical instruments, and avoid direct exposure to the
beam.
Radiação por raio laser ao abrir. Não olhe fixo no feixe de luz, não olhe
diretamente por meio de instrumentos óticos e evite exposição direta
com o feixe de luz.
Rayonnement laser si carter ouvert. Évitez de fixer le faisceau, de le
regarder directement avec des instruments optiques, ou de vous
exposer au rayon.
Laserstrahlung bei geöffnetem Gerät. Nicht direkt oder über optische
Instrumente in den Laserstrahl sehen und den Strahlungsbereich
meiden.
Kinyitáskor lézersugár ! Ne nézzen bele se szabad szemmel, se optikai
eszközökkel. Kerülje a sugárnyalábbal való érintkezést !
Aprendo l'unità vengono emesse radiazioni laser. Non fissare il fascio,
non guardarlo direttamente con strumenti ottici e evitare l'esposizione
diretta al fascio.
Notices xv

Radiación láser al abrir. No mire fijamente ni examine con instrumental
óptico el haz de luz. Evite la exposición directa al haz.
xvi Machine Type 2161 - Service Level A Aptiva HMS

Federal Communications Commission (FCC) Notice
The following statement applies to this IBM product. The statement for other
IBM products intended for use with this product will appear in their
accompanying manuals.
Federal Communications Commission (FCC)
Statement
Note: This equipment has been tested and found to comply with the limits
for a Class B digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
Consult an IBM authorized dealer or service representative for help.
Properly shielded and grounded cables and connectors must be used in
order to meet FCC emission limits. Proper cables and connectors are
available from IBM authorized dealers. IBM is not responsible for any radio
or television interference caused by using other than recommended cables
and connectors or by unauthorized changes or modifications to this
equipment. Unauthorized changes or modifications could void the user's
authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
Notices xvii

Canadian Department of Communications
Compliance Statement
This equipment does not exceed Class B limits per radio noise emissions for
digital apparatus, set out in the Radio Interference Regulation of the
Canadian Department of Communications.
Avis de conformité aux normes du ministère des
Communications du Canada
Cet équipement ne dépasse pas les limites de Classe B d'émission de bruits
radioélectriques pour les appareils numériques, telles que prescrites par le
Règlement sur le brouillage radioélectrique établi par le ministère des
Communications du Canada.
Canadian Department of Communications Certification Label
Notice: The Canadian Department of Communications label identifies
certified equipment. This certification means that the equipment meets
certain telecommunications network protective, operational and safety
requirements. The Department does not guarantee the equipment will
operate to the user’s satisfaction.
Before installing this equipment, users should ensure that it is permissible to
be connected to the facilities of the local telecommunications company. The
equipment must also be installed using an acceptable method of connection.
In some cases, the company’s inside wiring associated with a single line
individual service may be extended by means of a certified connector
assembly (telephone extension cord). The customer should be aware that
compliance with the above conditions may not prevent degradation of
service in some situations.
Repairs to certified equipment should be made by an authorized Canadian
maintenance facility designated by the supplier. Any repairs or alterations
made by the user to this equipment, or equipment malfunctions, may give
the telecommunications company cause to request the user to disconnect
the equipment.
Users should ensure for their own protection that the electrical ground
connections of the power utility, telephone lines and internal water pipe
system, if present, are connected together. This precaution may be
particularly important in rural areas.
xviii Machine Type 2161 - Service Level A Aptiva HMS