Lenovo 27IAH7 Owner's manual

IdeaCentre AIO 5
Hardware Maintenance Manual

First Edition (May 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 service
information. . . . . . . . . . . . . . . 2
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. Product overview . . . . . 29
O er iew . . . . . . . . . . . . . . . . . 29
Rear . . . . . . . . . . . . . . . . . . . 30
Chapter 4. Service checkout 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,
diagnostics, and recovery . . . . . . . 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 . . . . . . . . . . . . . . . 56
Remo ing and installing hardware . . . . . . . 57
External options . . . . . . . . . . . . . 57
Power cord. . . . . . . . . . . . . . . 57
Computer upper co er . . . . . . . . . . 57
System stand (with or without wireless
charging module) . . . . . . . . . . . . 59
Computer back co er. . . . . . . . . . . 59
Camera module . . . . . . . . . . . . . 61
Microphone module . . . . . . . . . . . 62
Power switch board . . . . . . . . . . . 63
Side I/O board . . . . . . . . . . . . . 64
System board shielding fence . . . . . . . 65
PSU and PSU socket bracket . . . . . . . 66
Memory module . . . . . . . . . . . . . 68
Heat sink . . . . . . . . . . . . . . . 69
System fans . . . . . . . . . . . . . . 70
M.2 solid-state dri e . . . . . . . . . . . 71
Wi-Fi card . . . . . . . . . . . . . . . 72
Internal speaker . . . . . . . . . . . . . 73
System board. . . . . . . . . . . . . . 74
Coin-cell battery. . . . . . . . . . . . . 75
Middle frame . . . . . . . . . . . . . . 76
Wi-Fi antennas . . . . . . . . . . . . . 78
Front bezel . . . . . . . . . . . . . . . 79
LCD panel . . . . . . . . . . . . . . . 80
Chapter . Notices and
trademarks. . . . . . . . . . . . . . . 83
© Copyright Leno o 2022 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 medical care immediately.
CAUTION:
Avoid contact with hot components inside the computer. During operation, some components
become hot enough to burn the skin. Before you open the computer cover, turn off the computer,
disconnect power, and wait approximately 10 minutes for the components to cool.
© Copyright Leno o 2022 1

Electrical safety
CAUTION:
Electrical current from power, telephone, and communication cables can be hazardous. To avoid
personal injury or equipment damage, disconnect the attached power cords, telecommunication
systems, networks, and modems before you open the computer covers, unless instructed otherwise
in the installation and configuration procedures.
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 AIO 5 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 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 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 electrostatic discharge-sensitive devices
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 notices (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 AIO 5 Hardware Maintenance Manual

• Italian
• Korean
• Spanish
DANGER
Electrical current from power, telephone and communication cables is hazardous.
To avoid a shock hazard:
• Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration
of this product during an electrical storm.
• Connect all power cords to a properly wired and grounded electrical outlet.
• Connect to properly wired outlets any equipment that will be attached to this product.
• When possible, use one hand only to connect or disconnect signal cables.
• Never turn on any equipment when there is evidence of fire, water, or structural damage.
• Disconnect the attached power cords, telecommunications systems, networks, and modems
before you open the device covers, unless instructed otherwise in the installation and configuration
procedures.
• Connect and disconnect cables as described in the following tables when installing, moving, or
opening covers on this product or attached devices.
To Connect To Disconnect
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 replacing the lithium battery, use only Part Number 45C1566 or an equivalent type battery
recommended by the manufacturer. If your system has a module containing a lithium battery, replace
it only with the same module type made by the same manufacturer. The battery contains lithium and
can 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 local ordinances or regulations.
Chapter 1.Important safety information 5

CAUTION:
When laser products (such as CD-ROMs, DVD-ROM drives, fiber optic devices, or transmitters) are
installed, note the following:
• Do not remove the covers. Removing the covers of the laser product could result in exposure to
hazardous laser radiation. There are no serviceable parts inside the device.
• Use of controls or adjustments or performance of procedures other than those specified herein
might result in hazardous radiation exposure.
DANGER
Some laser products contain 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 directly with optical
instruments, and avoid direct exposure to the beam.
≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb)
CAUTION:
Use safe practices when lifting.
CAUTION:
The power control button on the device and the power switch on the power supply do not turn off the
electrical current supplied to the device. The device also might have more than one power cord. To
remove all electrical current from the device, ensure that all power cords are disconnected from the
power source.
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6IdeaCentre AIO 5 Hardware Maintenance Manual

Chapter 1.Important safety information

≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb)
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8IdeaCentre AIO 5 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 Conectar: Para Desconectar:
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 com Número de Peça 45C1566 ou um tipo de
bateria equivalente recomendado pelo Se o seu sistema possui um módulo com uma bateria de lítio,
substitua-o apenas por um módulo do mesmo tipo e do mesmo fabricante. A bateria contém lítio e
pode explodir se não for utilizada, manuseada ou descartada de maneira correta.
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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Chapter 1.Important safety information 13

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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 AIO 5 Hardware Maintenance Manual

Connexion Déconnexion
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:
Remplacer la pile au lithium usagée par une pile de référence identique exclusivement, (référence
45C1566), ou suivre les instructions du fabricant qui en définit les équivalences. Si votre système est
doté d'un module contenant une pile au lithium, vous devez le remplacer uniquement par un module
identique, produit par le même fabricant. La pile contient du lithium et peut exploser en cas 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,
• chercher 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 connaissance des informations suivantes :
• Ne retirez pas le carter. En ouvrant l'unité de CD-ROM ou de DVD-ROM, vous vous exposez au
rayonnement dangereux du laser. Aucune pièce de l'unité n'est réparable.
• Pour éviter tout risque d'exposition au rayon laser, respectez les consignes de réglage et
d'utilisation des commandes, ainsi que les procédures décrites dans le présent manuel.
DANGER
Certains produits à laser contiennent une diode à laser intégrée de classe 3A ou 3B. Prenez
connaissance des informations suivantes:
Rayonnement laser lorsque le carter est ouvert. Evitez toute expositiondirecte au rayon laser. Evitez
de regarder fixement le faisceau 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 machine avec précaution.
ATTENTION:
L'interrupteur de contrôle d'alimentation de l'unité et l'interrupteur dubloc d'alimentation ne coupent
pas le courant électrique alimentantl'unité. En outre, le système peut être équipé de plusieurs
cordonsd'alimentation. Pour mettre l'unité hors tension, vous devez déconnectertous les cordons de
la source d'alimentation.
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VORSICHT
An Netz-, Telefon- und Datenleitungen können gefährliche Spannungen anliegen.
Aus Sicherheitsgründen:
• Bei Gewitter an diesem Gerät keine Kabel anschließen oder lösen. Ferner keine Installations-,
Wartungs- oder Rekonfigurationsarbeiten durchführen.
• Gerät nur an eine Schutzkontaktsteckdose mit ordnungsgemäß geerdetem Schutzkontakt
anschließen.
• Alle angeschlossenen Geräte ebenfalls an Schutzkontaktsteckdosen mit ordnungsgemäß
geerdetem Schutzkontakt anschließen.
• Die Signalkabel nach Möglichkeit einhändig anschließen oder lösen, um einen Stromschlag durch
Berühren von Oberflächen mit unterschiedlichem elektrischem Potenzial zu vermeiden.
• Geräte niemals einschalten, wenn Hinweise auf Feuer, Wasser oder Gebäudeschäden vorliegen.
16 IdeaCentre AIO 5 Hardware Maintenance Manual