Lenovo 07ACH7 Owner's manual

IdeaCentre 3 Hardware Maintenance Manual

Second Edition (June 2022)
© Copyright Lenovo 2022.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is deli ered pursuant to a General Ser ices
Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-
35F-05925.

Contents
Chapter 1. Important safety
information. . . . . . . . . . . . . . . . 1
General safety . . . . . . . . . . . . . . . . 1
Electrical safety . . . . . . . . . . . . . . . . 2
Safety inspection guide . . . . . . . . . . . . . 3
Handling electrostatic discharge-sensiti e
de ices . . . . . . . . . . . . . . . . . . . 4
Grounding requirements . . . . . . . . . . . . 4
Safety notices (multi-lingual translations) . . . . . . 4
Chapter 2. Important servi e
information. . . . . . . . . . . . . . . 27
Strategy for replacing FRUs . . . . . . . . . . 27
Strategy for replacing a hard disk dri e or a
solid-state dri e . . . . . . . . . . . . . 27
Important notice for replacing a system
board . . . . . . . . . . . . . . . . . 27
How to use error codes . . . . . . . . . . 28
Strategy for replacing FRUs for CTO, special-bid,
and standard models. . . . . . . . . . . . . 28
Product definition . . . . . . . . . . . . 28
FRU identification . . . . . . . . . . . . 28
Chapter 3. Produ t overview . . . . . 29
Front . . . . . . . . . . . . . . . . . . . 29
Rear . . . . . . . . . . . . . . . . . . . 30
Chapter 4. Servi e he kout and
symptom-to-FRU index . . . . . . . . 31
Ser ice checkout . . . . . . . . . . . . . . 31
Problem determination tips . . . . . . . . 31
Symptom-to-FRU index . . . . . . . . . . . 32
Hard disk dri e boot error . . . . . . . . . 32
Power supply problems . . . . . . . . . . 33
Beep symptoms . . . . . . . . . . . . . 33
POST error codes . . . . . . . . . . . . 34
Miscellaneous error conditions . . . . . . . 35
Undetermined problems . . . . . . . . . 37
Chapter 5. Troubleshooting,
diagnosti s, and re overy . . . . . . . 39
Basic procedure for resol ing computer
problems . . . . . . . . . . . . . . . . . 39
Troubleshooting . . . . . . . . . . . . . . 39
Startup problems . . . . . . . . . . . . 40
Screen problems . . . . . . . . . . . . 41
Audio problems . . . . . . . . . . . . . 42
Network problems . . . . . . . . . . . . 42
Performance problems . . . . . . . . . . 45
Storage dri e problems . . . . . . . . . . 46
CD or DVD problems . . . . . . . . . . . 46
Serial connector problems . . . . . . . . . 47
Software problems. . . . . . . . . . . . 47
Reco ery . . . . . . . . . . . . . . . . . 47
Restore system files and settings to an earlier
point . . . . . . . . . . . . . . . . . 48
Restore your files from a backup . . . . . . 48
Reset your computer . . . . . . . . . . . 48
Use ad anced options . . . . . . . . . . 48
Windows automatic reco ery. . . . . . . . 48
Create and use a reco ery USB de ice . . . . 48
Update the de ice dri er . . . . . . . . . 49
Chapter 6. Hardware removal and
installation . . . . . . . . . . . . . . . 51
Handling static-sensiti e de ices . . . . . . . . 51
Ser ice tool kit . . . . . . . . . . . . . . . 51
Major FRUs and CRUs . . . . . . . . . . . . 52
System board . . . . . . . . . . . . . . . 54
Remo ing and installing hardware . . . . . . . 54
External options . . . . . . . . . . . . . 54
Power cord. . . . . . . . . . . . . . . 55
Computer co er . . . . . . . . . . . . . 55
Front bezel . . . . . . . . . . . . . . . 56
Card reader . . . . . . . . . . . . . . 57
Optical dri e . . . . . . . . . . . . . . 58
Optical dri e bracket . . . . . . . . . . . 59
Storage dri e . . . . . . . . . . . . . . 60
M.2 solid-state dri e . . . . . . . . . . . 62
Memory module . . . . . . . . . . . . . 64
Heat sink . . . . . . . . . . . . . . . 65
Front Wi-Fi antenna . . . . . . . . . . . 66
Rear Wi-Fi antenna co er . . . . . . . . . 67
Rear Wi-Fi antenna. . . . . . . . . . . . 68
Co er presence switch . . . . . . . . . . 69
Wi-Fi card . . . . . . . . . . . . . . . 70
Thermal sensor . . . . . . . . . . . . . 71
Coin-cell battery. . . . . . . . . . . . . 71
Power supply assembly . . . . . . . . . . 72
System board. . . . . . . . . . . . . . 74
Chapter 7. Noti es and
trademarks. . . . . . . . . . . . . . . 77
© Copyright Leno o 2021 i

About this manual
This manual pro ides ser ice and reference information for Leno o® computers listed on the front co er.
Illustrations in this manual might look different from your product.
Use this manual along with the ad anced diagnostic tests to troubleshoot problems.
Important: This manual is intended only for trained ser ice technicians who are familiar with Leno o
computers. Use this manual along with the ad anced diagnostic tests to troubleshoot problems effecti ely.
Before ser icing a Leno o computer, be sure to read and understand Chapter 1 “Important safety
information” on page 1.

Chapter 1. Important safety information
General safety
Follow these rules to ensure general safety:
• Obser e good housekeeping in the area of the machines during and after maintenance.
• When lifting any hea y 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. Ne er mo e suddenly or twist when you attempt to lift.
4. Lift by standing or by pushing up with your leg muscles; this action remo es the strain from the
muscles in your back.
Attention: Do not attempt to lift any objects that weigh more than 16 kg (35 lb) or objects that you
think are too hea y 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 ser ice representati es and the customer's personnel are
not in a hazardous position.
• Place remo ed co ers and other parts in a safe place, away from all personnel, while you are ser icing the
machine.
• Keep your tool case away from walk areas so that other people will not trip o er it.
• Do not wear loose clothing that can be trapped in the mo ing parts of a machine. Ensure that your slee es
are fastened or rolled up abo e your elbows. If your hair is long, fasten it.
• Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconducti e clip, approximately
8 centimeters (3 inches) from the end.
• Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing.
Remember: Metal objects are good electrical conductors.
• Wear safety glasses when you are: hammering, drilling, soldering, cutting wire, attaching springs, using
sol ents, or working in any other conditions that might be hazardous to your eyes.
• After ser ice, reinstall all safety shields, guards, labels, and ground wires. Replace any safety de ice that
is worn or defecti e.
• Reinstall all co ers correctly before returning the machine to the customer.
CAUTION:
Keep fingers and other parts of your body away from hazardous, moving parts. If you suffer an injury,
seek medi al are immediately.
CAUTION:
Avoid onta t with hot omponents inside the omputer. During operation, some omponents
be ome hot enough to burn the skin. Before you open the omputer over, turn off the omputer,
dis onne t power, and wait approximately 10 minutes for the omponents to ool.
© Copyright Leno o 2021 1

Ele tri al safety
CAUTION:
Ele tri al urrent from power, telephone, and ommuni ation ables an be hazardous. To avoid
personal injury or equipment damage, dis onne t the atta hed power ords, tele ommuni ation
systems, networks, and modems before you open the omputer overs, unless instru ted otherwise
in the installation and onfiguration pro edures.
Obser e the following rules when working on electrical equipment.
Important: Use only appro ed tools and test equipment. Some hand tools ha e handles co ered with a soft
material that does not insulate you when working with li e electrical currents. Many customers ha e, near
their equipment, rubber floor mats that contain small conducti e 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 oltages.
• Disconnect all power before:
– Performing a mechanical inspection
– Working near power supplies
– Remo ing or installing Field Replaceable Units (FRUs)
• 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 exposed electrical circuits, obser e 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 obser ing the abo e rule,
you may pre ent a current from passing through your body.
– When using a tester, set the controls correctly and use the appro ed 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.
Obser e the special safety precautions when you work with ery high oltages; these instructions are in
the safety sections of maintenance information. Use extreme care when measuring high oltages.
• Regularly inspect and maintain your electrical hand tools for safe operational condition.
• Do not use worn or broken tools and testers.
• Never assume that power has been disconnected from a circuit. First, check that it has been 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 li e electrical circuits with the reflecti e surface of a plastic dental mirror. The surface is
conducti e; such touching can cause personal injury and machine damage.
2IdeaCentre 3 Hardware Maintenance Manual

• Do not ser ice the following parts with the power on when they are remo ed 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 ictim yourself.
– Switch off power.
– Send another person to get medical aid.
Safety inspe tion 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 ser ice personnel from injury. This guide addresses only those items. Howe er, good judgment should
be used to identify potential safety hazards due to attachment of features or options not co ered 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:
• Electrical hazards, especially primary power (primary oltage on the frame can cause serious or fatal
electrical shock).
• Explosi e 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 co ers 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. Remo e the co er.
5. Check for any ob ious alterations. Use good judgment as to the safety of any alterations.
6. Check inside the unit for any ob ious 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.
Chapter 1.Important safety information 3

8. Check that the power-supply co er fasteners (screws or ri ets) ha e not been remo ed or tampered
with.
Handling ele trostati dis harge-sensitive devi es
Any computer part containing transistors or integrated circuits (ICs) should be considered sensiti e 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 protecti e de ices you use ha e been certified (ISO 9000) as fully effecti e.
When handling ESD-sensiti e parts:
• Keep the parts in protecti e packages until they are inserted into the product.
• A oid contact with other people while handling the part.
• Wear a grounded wrist strap against your skin to eliminate static on your body.
• Pre ent the part from touching your clothing. Most clothing is insulati e and retains a charge e en when
you are wearing a wrist strap.
• Use the black side of a grounded work mat to pro ide a static-free work surface. The mat is especially
useful when handling ESD-sensiti e de ices.
• Select a grounding system, such as those listed below, to pro ide protection that meets the specific
ser ice requirement.
Note: The use of a grounding system is desirable but not required to protect against ESD damage.
– Attach the ESD ground clip to any frame ground, ground braid, or green-wire ground.
– Use an ESD common ground or reference point when working on a double-insulated or battery-
operated system. You can use coax or connector-outside shells on these systems.
– Use the round ground-prong of the ac plug on ac-operated computers.
Grounding requirements
Electrical grounding of the computer is required for operator safety and correct system function. Proper
grounding of the electrical outlet can be erified by a certified electrician.
Safety noti es (multi-lingual translations)
The caution and danger safety notices in this section are pro ided in the following languages:
• English
• Arabic
• Brazilian/Portuguese
• Chinese (simplified)
• Chinese (traditional)
• French
• German
• Hebrew
4IdeaCentre 3 Hardware Maintenance Manual

• Italian
• Korean
• Spanish
DANGER
Electrical current from power, telephone and communication cables is hazardous.
To avoid a sho k hazard:
• Do not onne t or dis onne t any ables or perform installation, maintenan e, or re onfiguration
of this produ t during an ele tri al storm.
• Conne t all power ords to a properly wired and grounded ele tri al outlet.
• Conne t to properly wired outlets any equipment that will be atta hed to this produ t.
• When possible, use one hand only to onne t or dis onne t signal ables.
• Never turn on any equipment when there is eviden e of fire, water, or stru tural damage.
• Dis onne t the atta hed power ords, tele ommuni ations systems, networks, and modems
before you open the devi e overs, unless instru ted otherwise in the installation and onfiguration
pro edures.
• Conne t and dis onne t ables as des ribed in the following tables when installing, moving, or
opening overs on this produ t or atta hed devi es.
To Conne t To Dis onne t
1. Turn e erything OFF.
2. First, attach all cables to de ices.
3. Attach signal cables to connectors.
4. Attach power cords to outlet.
5. Turn de ice ON.
1. Turn e erything OFF.
2. First, remo e power cords from outlet.
3. Remo e signal cables from connectors.
4. Remo e all cables from de ices.
CAUTION:
When repla ing the lithium battery, use only Part Number 45C1566 or an equivalent type battery
re ommended by the manufa turer. If your system has a module ontaining a lithium battery, repla e
it only with the same module type made by the same manufa turer. The battery ontains lithium and
an explode if not properly used, handled, or disposed of. Do not:
• Throw or immerse into water
• Heat to more than 100°C (212°F)
• Repair or disassemble
Dispose of the battery as required by lo al ordinan es or regulations.
Chapter 1.Important safety information 5

CAUTION:
When laser produ ts (su h as CD-ROMs, DVD-ROM drives, fiber opti devi es, or transmitters) are
installed, note the following:
• Do not remove the overs. Removing the overs of the laser produ t ould result in exposure to
hazardous laser radiation. There are no servi eable parts inside the devi e.
• Use of ontrols or adjustments or performan e of pro edures other than those spe ified herein
might result in hazardous radiation exposure.
DANGER
Some laser produ ts ontain an embedded Class 3A or Class 3B laser diode. Note the following:
Laser radiation when open. Do not stare into the beam, do not view dire tly with opti al
instruments, and avoid dire t exposure to the beam.
≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb)
CAUTION:
Use safe pra ti es when lifting.
CAUTION:
The power ontrol button on the devi e and the power swit h on the power supply do not turn off the
ele tri al urrent supplied to the devi e. The devi e also might have more than one power ord. To
remove all ele tri al urrent from the devi e, ensure that all power ords are dis onne ted from the
power sour e.
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6IdeaCentre 3 Hardware Maintenance Manual

Chapter 1.Important safety information 7

≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb)
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8IdeaCentre 3 Hardware Maintenance Manual

PERIGO
A corrente elétrica pro eniente de cabos de alimentação, de telefone e de comunicações é perigosa.
Para e itar risco de choque elétrico:
• Não conecte nem desconecte nenhum cabo ou execute instalação, manutenção ou reconfiguração deste
produto durante uma tempestade com raios.
• Conecte todos os cabos de alimentação a tomadas elétricas corretamente instaladas e aterradas.
• Todo equipamento que for conectado a este produto de e ser conectado a tomadas corretamente
instaladas.
• Quando possí el, utilize apenas uma das mãos para conectar ou desconectar cabos de sinal.
• Nunca ligue nenhum equipamento quando hou er e idência de fogo, água ou danos estruturais.
• Antes de abrir tampas de dispositi os, desconecte cabos de alimentação, sistemas de telecomunicação,
redes e modems conectados, a menos que especificado de maneira diferente nos procedimentos de
instalação e configuração.
• Conecte e desconecte os cabos conforme descrito na tabela apresentada a seguir ao instalar, mo er ou
abrir tampas deste produto ou de dispositi os conectados.
Para Cone tar: Para Des one tar:
1. DESLIGUE Tudo.
2. Primeiramente, conecte todos os cabos aos
dispositi os.
3. Conecte os cabos de sinal aos conectores.
4. Conecte os cabos de alimentação às tomadas.
5. LIGUE os dispositi os.
1. DESLIGUE Tudo.
2. Primeiramente, remo a os cabos de alimentação das
tomadas.
3. Remo a os cabos de sinal dos conectores.
4. Remo a todos os cabos dos dispositi os.
CUIDADO:
Ao substituir a bateria de lítio, utilize apenas uma bateria om Número de Peça 45C1566 ou um tipo de
bateria equivalente re omendado pelo Se o seu sistema possui um módulo om uma bateria de lítio,
substitua-o apenas por um módulo do mesmo tipo e do mesmo fabri ante. A bateria ontém lítio e
pode explodir se não for utilizada, manuseada ou des artada de maneira orreta.
Não:
• Jogue ou coloque na água
• Aqueça a mais de 100°C (212°F)
• Conserte nem desmonte
Descarte a bateria conforme requerido pelas leis ou regulamentos locais.
PRECAUCIÓN:
Chapter 1.Important safety information 9

Quando produtos a laser (como unidades de CD-ROMs, unidades de DVD-ROM, dispositi os de fibra ótica
ou transmissores) esti erem instalados, obser e o seguinte:
• Não remo a as tampas. A remoção das tampas de um produto a laser pode resultar em exposição
prejudicial à radiação de laser. Não existem peças que podem ser consertadas no interior do dispositi o.
• A utilização de controles ou ajustes ou a execução de procedimentos diferentes dos especificados aqui
pode resultar em exposição prejudicial à radiação.
PERIGO
Alguns produtos a laser contêm diodo de laser integrado da Classe 3A ou da Classe 3B. Obser e o seguinte:
Radiação a laser quando aberto. Não olhe diretamente para o feixe a olho nu ou com instrumentos ópticos e
e ite exposição direta ao feixe.
≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb)
CUIDADO:
Utilize procedimentos de segurança para le antar equipamentos.
CUIDADO:
O botão de controle de alimentação do dispositi o e o botão para ligar/desligar da fonte de alimentação não
desligam a corrente elétrica fornecida ao dispositi o. O dispositi o também pode ter mais de um cabo de
alimentação. Para remo er toda a corrente elétrica do dispositi o, assegure que todos os cabos de
alimentação estejam desconectados da fonte de alimentação.
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Chapter 1.Important safety information 11

1
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12 IdeaCentre 3 Hardware Maintenance Manual

Chapter 1.Important safety information 13

1
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DANGER
Le courant électrique pro enant de l'alimentation, du téléphone et des câbles de transmission peut présenter
un danger.
Pour é iter tout risque de choc électrique :
• Ne manipulez aucun câble et n'effectuez aucune opération d'installation, d'entretien ou de reconfiguration
de ce produit au cours d'un orage.
• Branchez tous les cordons d'alimentation sur un socle de prise de courant correctement câblé et mis à la
terre.
• Branchez sur des socles de prise de courant correctement câblés tout équipement connecté à ce produit.
• Lorsque cela est possible, n'utilisez qu'une seule main pour connecter ou déconnecter les câbles
d'interface.
• Ne mettez jamais un équipement sous tension en cas d'incendie ou d'inondation, ou en présence de
dommages matériels.
• A ant de retirer les carters de l'unité, mettez celle-ci hors tension et déconnectez ses cordons
d'alimentation, ainsi que les câbles qui la relient aux réseaux, aux systèmes de télécommunication et aux
modems (sauf instruction contraire mentionnée dans les procédures d'installation et de configuration).
• Lorsque ous installez, que ous déplacez, ou que ous manipulez le présent produit ou des
périphériques qui lui sont raccordés, reportez- ous aux instructions ci-dessous pour connecter et
déconnecter les différents cordons.
14 IdeaCentre 3 Hardware Maintenance Manual

Connexion Dé onnexion
1. Mettez les unités HORS TENSION.
2. Commencez par brancher tous les cordons sur les
unités.
3. Branchez les câbles d'interface sur des
connecteurs.
4. Branchez les cordons d'alimentation sur des prises.
5. Mettez les unités SOUS TENSION.
1. Mettez les unités HORS TENSION.
2. Débranchez les cordons d'alimentation des prises.
3. Débranchez les câbles d'interface des connecteurs.
4. Débranchez tous les câbles des unités.
ATTENTION:
Rempla er la pile au lithium usagée par une pile de référen e identique ex lusivement, (référen e
45C1566), ou suivre les instru tions du fabri ant qui en définit les équivalen es. Si votre système est
doté d'un module ontenant une pile au lithium, vous devez le rempla er uniquement par un module
identique, produit par le même fabri ant. La pile ontient du lithium et peut exploser en as de
mauvaise utilisation, de mauvaise manipulation ou de mise au rebut inappropriée.
Ne pas :
• la jeter à l'eau,
• l'exposer à des températures supérieures à 100°C,
• her her à la réparer ou à la démonter.
Ne pas mettre la pile à la poubelle. Pour la mise au rebut, se reporter à la réglementation en vigueur.
ATTENTION:
Si des produits à laser (tels que des unités de CD-ROM, de DVD-ROM, des unités à fibres optiques, ou
des émetteurs) sont installés, prenez onnaissan e des informations suivantes :
• Ne retirez pas le arter. En ouvrant l'unité de CD-ROM ou de DVD-ROM, vous vous exposez au
rayonnement dangereux du laser. Au une piè e de l'unité n'est réparable.
• Pour éviter tout risque d'exposition au rayon laser, respe tez les onsignes de réglage et
d'utilisation des ommandes, ainsi que les pro édures dé rites dans le présent manuel.
DANGER
Certains produits à laser ontiennent une diode à laser intégrée de lasse 3A ou 3B. Prenez
onnaissan e des informations suivantes:
Rayonnement laser lorsque le arter est ouvert. Evitez toute expositiondire te au rayon laser. Evitez
de regarder fixement le fais eau ou del'observer à l'aide d'instruments optiques.
Chapter 1.Important safety information 15

≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb)
ATTENTION:
Soulevez la ma hine ave pré aution.
ATTENTION:
L'interrupteur de ontrôle d'alimentation de l'unité et l'interrupteur dublo d'alimentation ne oupent
pas le ourant éle trique alimentantl'unité. En outre, le système peut être équipé de plusieurs
ordonsd'alimentation. Pour mettre l'unité hors tension, vous devez dé onne tertous les ordons de
la sour e d'alimentation.
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VORSICHT
An Netz-, Telefon- und Datenleitungen können gefährliche Spannungen anliegen.
Aus Si herheitsgründen:
• Bei Gewitter an diesem Gerät keine Kabel ans hließen oder lösen. Ferner keine Installations-,
Wartungs- oder Rekonfigurationsarbeiten dur hführen.
• Gerät nur an eine S hutzkontaktste kdose mit ordnungsgemäß geerdetem S hutzkontakt
ans hließen.
• Alle anges hlossenen Geräte ebenfalls an S hutzkontaktste kdosen mit ordnungsgemäß
geerdetem S hutzkontakt ans hließen.
• Die Signalkabel na h Mögli hkeit einhändig ans hließen oder lösen, um einen Stroms hlag dur h
Berühren von Oberflä hen mit unters hiedli hem elektris hem Potenzial zu vermeiden.
• Geräte niemals eins halten, wenn Hinweise auf Feuer, Wasser oder Gebäudes häden vorliegen.
16 IdeaCentre 3 Hardware Maintenance Manual