Lenovo ThinkCentre M75q Gen 2 Owner's manual

M75q Gen 2
Hardware Maintenance Manual

Second Edition (March 2021)
© Copyright Lenovo 2021.
LIMITED AND RESTRICTED RIGHTS NOTICE: I data or so tware is delivered pursuant to a General Services
Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set orth in Contract No. GS-
35F-05925.

Contents
About this anual . . . . . . . . . . . . iii
Chapter 1. I portant safety
infor ation. . . . . . . . . . . . . . . . 1
General sa ety . . . . . . . . . . . . . . . . 1
Electrical sa ety . . . . . . . . . . . . . . . . 2
Sa ety inspection guide. . . . . . . . . . . . . 3
Handling electrostatic discharge-sensitive
devices . . . . . . . . . . . . . . . . . . . 4
Grounding requirements . . . . . . . . . . . . 4
Sa ety notices (multi-lingual translations) . . . . . . 4
Chapter 2. I portant service
infor ation. . . . . . . . . . . . . . . 27
Strategy or replacing FRUs . . . . . . . . . . 27
Strategy or replacing a hard disk drive or a
solid-state drive . . . . . . . . . . . . . 27
Important notice or replacing a system
board . . . . . . . . . . . . . . . . . 27
How to use error codes . . . . . . . . . . 28
Strategy or replacing FRUs or CTO, special-bid,
and standard models. . . . . . . . . . . . . 28
Product de inition . . . . . . . . . . . . 28
FRU identi ication . . . . . . . . . . . . 28
Chapter 3. Product overview . . . . . 29
Front . . . . . . . . . . . . . . . . . . . 29
Rear . . . . . . . . . . . . . . . . . . . 30
Chapter 4. Service checkout and
sy pto -to-FRU index . . . . . . . . 31
Service checkout . . . . . . . . . . . . . . 31
Problem determination tips . . . . . . . . 31
Symptom-to-FRU index . . . . . . . . . . . 32
Hard disk drive 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 or resolving computer
problems . . . . . . . . . . . . . . . . . 39
Troubleshooting . . . . . . . . . . . . . . 39
Startup problems . . . . . . . . . . . . 40
Audio problems . . . . . . . . . . . . . 41
Network problems . . . . . . . . . . . . 41
Per ormance problems . . . . . . . . . . 44
Storage drive problems . . . . . . . . . . 45
CD or DVD problems . . . . . . . . . . . 45
Serial connector problems . . . . . . . . . 46
USB device problems . . . . . . . . . . 46
So tware problems. . . . . . . . . . . . 47
Diagnostics . . . . . . . . . . . . . . . . 47
Lenovo diagnostic tools . . . . . . . . . . 47
UEFI diagnostic program . . . . . . . . . 47
Recovery . . . . . . . . . . . . . . . . . 48
Restore system iles and settings to an earlier
point . . . . . . . . . . . . . . . . . 48
Restore your iles rom a backup . . . . . . 48
Reset your computer . . . . . . . . . . . 48
Use advanced options . . . . . . . . . . 48
Windows automatic recovery. . . . . . . . 49
Create and use a recovery USB device . . . . 49
Update the device driver . . . . . . . . . 49
Chapter 6. Hardware re oval and
installation . . . . . . . . . . . . . . . 51
Handling static-sensitive devices . . . . . . . . 51
Service tool kit . . . . . . . . . . . . . . . 51
Major FRUs and CRUs . . . . . . . . . . . . 52
System board . . . . . . . . . . . . . . . 55
Removing and installing hardware . . . . . . . 56
Power adapter bracket . . . . . . . . . . 56
Vertical stand . . . . . . . . . . . . . . 58
External optical drive . . . . . . . . . . . 59
VESA mount bracket . . . . . . . . . . . 62
Dust shield . . . . . . . . . . . . . . . 63
External Wi-Fi antenna . . . . . . . . . . 64
Computer cover . . . . . . . . . . . . . 65
Internal speaker . . . . . . . . . . . . . 66
System an . . . . . . . . . . . . . . . 67
Coin-cell battery. . . . . . . . . . . . . 68
Hard disk drive . . . . . . . . . . . . . 69
Wi-Fi card . . . . . . . . . . . . . . . 71
Bottom cover . . . . . . . . . . . . . . 72
Memory module . . . . . . . . . . . . . 73
M.2 solid-state drive . . . . . . . . . . . 73
Heat sink . . . . . . . . . . . . . . . 75
Front Wi-Fi antenna . . . . . . . . . . . 76
Rear Wi-Fi antenna. . . . . . . . . . . . 77
Wi-Fi antenna bracket . . . . . . . . . . 78
Rear I/O shield . . . . . . . . . . . . . 79
Microprocessor . . . . . . . . . . . . . 80
© Copyright Lenovo 2021 i

System board. . . . . . . . . . . . . . 81 Notices and trade arks . . . . . . . . . 1
ii M75q Gen 2 Hardware Maintenance Manual

About this anual
This manual provides service and re erence in ormation or ThinkCentre® computers listed on the ront cover.
Illustrations in this manual might look di erent rom your product.
Use this manual along with the advanced diagnostic tests to troubleshoot problems.
I portant: This manual is intended only or trained service technicians who are amiliar with ThinkCentre
computers. Use this manual along with the advanced diagnostic tests to troubleshoot problems e ectively.
Be ore servicing a ThinkCentre computer, be sure to read and understand Chapter 1 “Important sa ety
in ormation” on page 1.
© Copyright Lenovo 2021 iii

iv M75q Gen 2 Hardware Maintenance Manual

Chapter 1. I portant safety infor ation
General safety
Follow these rules to ensure general sa ety:
• Observe good housekeeping in the area o the machines during and a ter maintenance.
• When li ting any heavy object:
1. Ensure you can stand sa ely without slipping.
2. Distribute the weight o the object equally between your eet.
3. Use a slow li ting orce. Never move suddenly or twist when you attempt to li t.
4. Li t by standing or by pushing up with your leg muscles; this action removes the strain rom the
muscles in your back.
Attention: Do not attempt to li t any objects that weigh more than 16 kg (35 lb) or objects that you
think are too heavy or you.
• Do not per orm any action that causes hazards to the customer, or that makes the equipment unsa e.
• Be ore you start the machine, ensure that other service representatives and the customer's personnel are
not in a hazardous position.
• Place removed covers and other parts in a sa e place, away rom all personnel, while you are servicing the
machine.
• Keep your tool case away rom walk areas so that other people will not trip over it.
• Do not wear loose clothing that can be trapped in the moving parts o a machine. Ensure that your sleeves
are astened or rolled up above your elbows. I your hair is long, asten it.
• Insert the ends o your necktie or scar inside clothing or asten it with a nonconductive clip, approximately
8 centimeters (3 inches) rom the end.
• Do not wear jewelry, chains, metal- rame eyeglasses, or metal asteners or your clothing.
Re e ber: Metal objects are good electrical conductors.
• Wear sa ety 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.
• A ter service, reinstall all sa ety shields, guards, labels, and ground wires. Replace any sa ety device that
is worn or de ective.
• Reinstall all covers correctly be ore returning the machine to the customer.
CAUTION:
Keep fingers and other parts of your body away fro hazardous, oving parts. If you suffer an injury,
seek edical care i ediately.
CAUTION:
Avoid contact with hot co ponents inside the co puter. During operation, so e co ponents
beco e hot enough to burn the skin. Before you open the co puter cover, turn off the co puter,
disconnect power, and wait approxi ately 10 inutes for the co ponents to cool.
© Copyright Lenovo 2021 1

Electrical safety
CAUTION:
Electrical current fro power, telephone, and co unication cables can be hazardous. To avoid
personal injury or equip ent da age, disconnect the attached power cords, teleco unication
syste s, networks, and ode s before you open the co puter covers, unless instructed otherwise
in the installation and configuration procedures.
Observe the ollowing rules when working on electrical equipment.
I portant: Use only approved tools and test equipment. Some hand tools have handles covered with a so t
material that does not insulate you when working with live electrical currents. Many customers have, near
their equipment, rubber loor mats that contain small conductive ibers to decrease electrostatic discharges.
Do not use this type o mat to protect yoursel rom electrical shock.
• Find the room emergency power-o (EPO) switch, disconnecting switch, or electrical outlet. I an electrical
accident occurs, you can then operate the switch or unplug the power cord quickly.
• Do not work alone under hazardous conditions or near equipment that has hazardous voltages.
• Disconnect all power be ore:
– Per orming a mechanical inspection
– Working near power supplies
– Removing or installing Field Replaceable Units (FRUs)
• Be ore you start to work on the machine, unplug the power cord. I you cannot unplug it, ask the customer
to power-o the wall box that supplies power to the machine and to lock the wall box in the o position.
• I you need to work on a machine that has exposed electrical circuits, observe the ollowing precautions:
– Ensure that another person, amiliar with the power-o controls, is near you.
Re e ber: Another person must be there to switch o the power, i necessary.
– Use only one hand when working with powered-on electrical equipment; keep the other hand in your
pocket or behind your back.
Re e ber: There must be a complete circuit to cause electrical shock. By observing the above rule,
you may prevent a current rom passing through your body.
– When using a tester, set the controls correctly and use the approved probe leads and accessories or
that tester.
– Stand on suitable rubber mats (obtained locally, i necessary) to insulate you rom grounds such as
metal loor strips and machine rames.
Observe the special sa ety precautions when you work with very high voltages; these instructions are in
the sa ety sections o maintenance in ormation. Use extreme care when measuring high voltages.
• Regularly inspect and maintain your electrical hand tools or sa e operational condition.
• Do not use worn or broken tools and testers.
• Never assume that power has been disconnected rom a circuit. First, check that it has been powered-o .
• Always look care ully or possible hazards in your work area. Examples o these hazards are moist loors,
nongrounded power extension cables, power surges, and missing sa ety grounds.
• Do not touch live electrical circuits with the re lective sur ace o a plastic dental mirror. The sur ace is
conductive; such touching can cause personal injury and machine damage.
2M75q Gen 2 Hardware Maintenance Manual

• Do not service the ollowing parts with the power on when they are removed rom their normal operating
places in a machine:
– Power supply units
– Pumps
– Blowers and ans
– Motor generators
and similar units. (This practice ensures correct grounding o the units.)
• I an electrical accident occurs:
– Use caution; do not become a victim yoursel .
– Switch o power.
– Send another person to get medical aid.
Safety inspection guide
The intent o this inspection guide is to assist you in identi ying potentially unsa e conditions on these
products. Each machine, as it was designed and built, had required sa ety items installed to protect users
and service personnel rom injury. This guide addresses only those items. However, good judgment should
be used to identi y potential sa ety hazards due to attachment o eatures or options not covered by this
inspection guide.
I any unsa e conditions are present, you must determine how serious the apparent hazard could be and
whether you can continue without irst correcting the problem.
Consider these conditions and the sa ety hazards they present:
• Electrical hazards, especially primary power (primary voltage on the rame can cause serious or atal
electrical shock).
• Explosive hazards, such as a damaged CRT ace or bulging capacitor
• Mechanical hazards, such as loose or missing hardware
The guide consists o a series o steps presented in a checklist. Begin the checks with the power o , and the
power cord disconnected.
Checklist:
1. Check exterior covers or damage (loose, broken, or sharp edges).
2. Power-o the computer. Disconnect the power cord.
3. Check the power cord or:
a. A third-wire ground connector in good condition. Use a meter to measure third-wire ground
continuity or 0.1 ohm or less between the external ground pin and rame ground.
b. The power cord should be the appropriate type as speci ied in the parts listings.
c. Insulation must not be rayed or worn.
4. Remove the cover.
5. Check or any obvious alterations. Use good judgment as to the sa ety o any alterations.
6. Check inside the unit or any obvious unsa e conditions, such as metal ilings, contamination, water or
other liquids, or signs o ire or smoke damage.
7. Check or worn, rayed, or pinched cables.
Chapter 1.Important sa ety in ormation 3

8. Check that the power-supply cover asteners (screws or rivets) have not been removed or tampered
with.
Handling electrostatic discharge-sensitive devices
Any computer part containing transistors or integrated circuits (ICs) should be considered sensitive to
electrostatic discharge (ESD). ESD damage can occur when there is a di erence 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-speci ic ESD procedures when they exceed the requirements noted here.
2. Make sure that the ESD protective devices you use have been certi ied (ISO 9000) as ully e ective.
When handling ESD-sensitive parts:
• Keep the parts in protective packages until they are inserted into the product.
• Avoid contact with other people while handling the part.
• Wear a grounded wrist strap against your skin to eliminate static on your body.
• Prevent the part rom touching your clothing. Most clothing is insulative and retains a charge even when
you are wearing a wrist strap.
• Use the black side o a grounded work mat to provide a static- ree work sur ace. The mat is especially
use ul when handling ESD-sensitive devices.
• Select a grounding system, such as those listed below, to provide protection that meets the speci ic
service requirement.
Note: The use o a grounding system is desirable but not required to protect against ESD damage.
– Attach the ESD ground clip to any rame ground, ground braid, or green-wire ground.
– Use an ESD common ground or re erence 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 o the ac plug on ac-operated computers.
Grounding require ents
Electrical grounding o the computer is required or operator sa ety and correct system unction. Proper
grounding o the electrical outlet can be veri ied by a certi ied electrician.
Safety notices ( ulti-lingual translations)
The caution and danger sa ety notices in this section are provided in the ollowing languages:
• English
• Arabic
• Brazilian/Portuguese
• Chinese (simpli ied)
• Chinese (traditional)
• French
• German
• Hebrew
4M75q Gen 2 Hardware Maintenance Manual

• Italian
• Korean
• Spanish
DANGER
Electrical current rom power, telephone and communication cables is hazardous.
To avoid a shock hazard:
• Do not connect or disconnect any cables or perfor installation, aintenance, or reconfiguration
of this product during an electrical stor .
• Connect all power cords to a properly wired and grounded electrical outlet.
• Connect to properly wired outlets any equip ent that will be attached to this product.
• When possible, use one hand only to connect or disconnect signal cables.
• Never turn on any equip ent when there is evidence of fire, water, or structural da age.
• Disconnect the attached power cords, teleco unications syste s, networks, and ode s
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, oving, or
opening covers on this product or attached devices.
To Connect To Disconnect
1. Turn everything OFF.
2. First, attach all cables to devices.
3. Attach signal cables to connectors.
4. Attach power cords to outlet.
5. Turn device ON.
1. Turn everything OFF.
2. First, remove power cords rom outlet.
3. Remove signal cables rom connectors.
4. Remove all cables rom devices.
CAUTION:
When replacing the lithiu battery, use only Part Nu ber 45C1566 or an equivalent type battery
reco ended by the anufacturer. If your syste has a odule containing a lithiu battery, replace
it only with the sa e odule type ade by the sa e anufacturer. The battery contains lithiu and
can explode if not properly used, handled, or disposed of. Do not:
• Throw or i erse into water
• Heat to ore than 100°C (212°F)
• Repair or disasse ble
Dispose of the battery as required by local ordinances or regulations.
Chapter 1.Important sa ety in ormation 5

CAUTION:
When laser products (such as CD-ROMs, DVD-ROM drives, fiber optic devices, or trans itters) are
installed, note the following:
• Do not re ove the covers. Re oving 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 adjust ents or perfor ance of procedures other than those specified herein
ight result in hazardous radiation exposure.
DANGER
So e laser products contain an e bedded Class 3A or Class 3B laser diode. Note the following:
Laser radiation when open. Do not stare into the bea , do not view directly with optical
instru ents, and avoid direct exposure to the bea .
≥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 ight have ore than one power cord. To
re ove all electrical current fro the device, ensure that all power cords are disconnected fro the
power source.
1
2
6M75q Gen 2 Hardware Maintenance Manual

Chapter 1.Important sa ety in ormation 7

≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb)
1
2
8M75q Gen 2 Hardware Maintenance Manual

PERIGO
A corrente elétrica proveniente de cabos de alimentação, de tele one e de comunicações é perigosa.
Para evitar risco de choque elétrico:
• Não conecte nem desconecte nenhum cabo ou execute instalação, manutenção ou recon iguração deste
produto durante uma tempestade com raios.
• Conecte todos os cabos de alimentação a tomadas elétricas corretamente instaladas e aterradas.
• Todo equipamento que or conectado a este produto deve ser conectado a tomadas corretamente
instaladas.
• Quando possível, utilize apenas uma das mãos para conectar ou desconectar cabos de sinal.
• Nunca ligue nenhum equipamento quando houver evidência de ogo, água ou danos estruturais.
• Antes de abrir tampas de dispositivos, desconecte cabos de alimentação, sistemas de telecomunicação,
redes e modems conectados, a menos que especi icado de maneira di erente nos procedimentos de
instalação e con iguração.
• Conecte e desconecte os cabos con orme descrito na tabela apresentada a seguir ao instalar, mover ou
abrir tampas deste produto ou de dispositivos conectados.
Para Conectar: Para Desconectar:
1. DESLIGUE Tudo.
2. Primeiramente, conecte todos os cabos aos
dispositivos.
3. Conecte os cabos de sinal aos conectores.
4. Conecte os cabos de alimentação às tomadas.
5. LIGUE os dispositivos.
1. DESLIGUE Tudo.
2. Primeiramente, remova os cabos de alimentação das
tomadas.
3. Remova os cabos de sinal dos conectores.
4. Remova todos os cabos dos dispositivos.
CUIDADO:
Ao substituir a bateria de lítio, utilize apenas u a bateria co Nú ero de Peça 45C1566 ou u tipo de
bateria equivalente reco endado pelo Se o seu siste a possui u ódulo co u a bateria de lítio,
substitua-o apenas por u ódulo do es o tipo e do es o fabricante. A bateria conté lítio e
pode explodir se não for utilizada, anuseada ou descartada de aneira correta.
Não:
• Jogue ou coloque na água
• Aqueça a mais de 100°C (212°F)
• Conserte nem desmonte
Descarte a bateria con orme requerido pelas leis ou regulamentos locais.
PRECAUCIÓN:
Chapter 1.Important sa ety in ormation 9

Quando produtos a laser (como unidades de CD-ROMs, unidades de DVD-ROM, dispositivos de ibra ótica
ou transmissores) estiverem instalados, observe o seguinte:
• Não remova 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 dispositivo.
• A utilização de controles ou ajustes ou a execução de procedimentos di erentes dos especi icados 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. Observe o seguinte:
Radiação a laser quando aberto. Não olhe diretamente para o eixe a olho nu ou com instrumentos ópticos e
evite exposição direta ao eixe.
≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb)
CUIDADO:
Utilize procedimentos de segurança para levantar equipamentos.
CUIDADO:
O botão de controle de alimentação do dispositivo e o botão para ligar/desligar da onte de alimentação não
desligam a corrente elétrica ornecida ao dispositivo. O dispositivo também pode ter mais de um cabo de
alimentação. Para remover toda a corrente elétrica do dispositivo, assegure que todos os cabos de
alimentação estejam desconectados da onte de alimentação.
1
2
10 M75q Gen 2 Hardware Maintenance Manual

Chapter 1.Important sa ety in ormation 11

1
2
12 M75q Gen 2 Hardware Maintenance Manual

Chapter 1.Important sa ety in ormation 13

1
2
DANGER
Le courant électrique provenant de l'alimentation, du téléphone et des câbles de transmission peut présenter
un danger.
Pour éviter tout risque de choc électrique :
• Ne manipulez aucun câble et n'e ectuez aucune opération d'installation, d'entretien ou de recon iguration
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'inter ace.
• Ne mettez jamais un équipement sous tension en cas d'incendie ou d'inondation, ou en présence de
dommages matériels.
• Avant 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 (sau instruction contraire mentionnée dans les procédures d'installation et de con iguration).
• Lorsque vous installez, que vous déplacez, ou que vous manipulez le présent produit ou des
périphériques qui lui sont raccordés, reportez-vous aux instructions ci-dessous pour connecter et
déconnecter les di érents cordons.
14 M75q Gen 2 Hardware Maintenance Manual