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on development-level systems and there is no guarantee that these measurements will be the same on 
generally available systems. Furthermore, some measurements may have been estimated through 
extrapolation. Actual results may vary. Users of this document should verify the applicable data for their 
specific environment.

This document is copyrighted by Lenovo and is not covered by any open source license, including any Linux 
agreement(s) which may accompany software included with this product. Lenovo may update this document 
at any time without notice.

For the latest information or any questions or comments, contact or visit the Lenovo Web site: 

https://support.lenovo.com

Trademarks

LENOVO, LENOVO logo, THINKCENTRE, and THINKCENTRE logo are trademarks of Lenovo. Intel and 
Optane are trademarks of Intel Corporation or its subsidiaries in the U.S. and/or other countries. Microsoft 
and Windows are trademarks of the Microsoft group of companies. DisplayPort and VESA are trademarks of 
the Video Electronics Standards Association. Wi-Fi, is a registered trademark of Wi-Fi Alliance. USB-C is a 
trademark of USB Implementers Forum. All other trademarks are the property of their respective owners. © 
2019 Lenovo.

2

ThinkCentre M75nHardware Maintenance Manual

Summary of Contents for ThinkCentre M75n

Page 1: ...ThinkCentre M75n Hardware Maintenance Manual ...

Page 2: ...enovo 2020 LIMITED AND RESTRICTED RIGHTS NOTICE If data or software is delivered pursuant to a General Services Administration GSA contract use reproduction or disclosure is subject to restrictions set forth in Contract No GS 35F 05925 ...

Page 3: ... computer problems 41 Troubleshooting 41 Startup problems 42 Audio problems 43 Network problems 43 Performance problems 46 Storage drive problems 47 CD or DVD problems 47 Serial connector problems 48 USB device problems 48 Software problems 49 Diagnostics 49 Lenovo diagnostic tools 49 UEFI diagnostic program 49 Recovery 50 Restore system files and settings to an earlier point 50 Restore your files...

Page 4: ...ter bracket kit 89 VESA mount bracket kit 92 I O box 94 Rear Wi Fi antenna 96 Bottom cover 97 Wi Fi card 98 M 2 solid state drives 100 System board and coin cell battery 101 Left cover and front antenna cable 103 Right cover 105 Internal speaker 106 Rear antenna cable 107 Heat sink 108 Notices and trademarks 1 ii ThinkCentre M75nHardware Maintenance Manual ...

Page 5: ... with the advanced diagnostic tests to troubleshoot problems Important This manual is intended only for trained service technicians who are familiar with ThinkCentre computers Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively Before servicing a ThinkCentre computer be sure to read and understand Chapter 1 Important safety information on page 1 Copyright ...

Page 6: ...iv ThinkCentre M75nHardware Maintenance Manual ...

Page 7: ... Do not wear loose clothing that can be trapped in the moving parts of a machine Ensure that your sleeves are fastened or rolled up above your elbows If your hair is long fasten it Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconductive clip approximately 8 centimeters 3 inches from the end Do not wear jewelry chains metal frame eyeglasses or metal fasteners for ...

Page 8: ...osition If you need to work on a machine that has exposed electrical circuits observe 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...

Page 9: ...sider these conditions and the safety hazards they present Electrical hazards especially primary power primary voltage on the frame can cause serious or fatal electrical shock Explosive 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 ...

Page 10: ...e and retains a charge even when you are wearing a wrist strap Use the black side of a grounded work mat to provide a static free work surface The mat is especially useful when handling ESD sensitive devices Select a grounding system such as those listed below to provide protection that meets the specific service requirement Note The use of a grounding system is desirable but not required to prote...

Page 11: ...ct 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 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 from outlet 3 Remove signal cables from con...

Page 12: ...cts 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 th...

Page 13: ...Chapter 1 Important safety information 7 ...

Page 14: ... 18 kg 37 lb 32 kg 70 5 lb 55 kg 121 2 lb 1 2 8 ThinkCentre M75nHardware Maintenance Manual ...

Page 15: ... os cabos conforme 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 ...

Page 16: ...odo de laser integrado da Classe 3A ou da Classe 3B Observe o seguinte Radiação a laser quando aberto Não olhe diretamente para o feixe a olho nu ou com instrumentos ópticos e evite exposição direta ao feixe 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 de...

Page 17: ...Chapter 1 Important safety information 11 ...

Page 18: ...1 2 12 ThinkCentre M75nHardware Maintenance Manual ...

Page 19: ...Chapter 1 Important safety information 13 ...

Page 20: ...isez 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 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 sa...

Page 21: ...ropriée 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 suivan...

Page 22: ...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 Signalka...

Page 23: ...atterie nur durch eine Batterie mit der Teilenummer 45C1566 oder eine gleichwertige vom Hersteller empfohlene Batterie ersetzen Enthält das System ein Modul mit einer Lithiumbatterie dieses nur durch ein Modul desselben Typs und von demselben Hersteller ersetzen Die Batterie enthält Lithium und kann bei unsachgemäßer Verwendung Handhabung oder Entsorgung explodieren Die Batterie nicht mit Wasser i...

Page 24: ...en der Maschine beachten ACHTUNG Mit dem Netzschalter an der Einheit und am Netzteil wird die Stromversorgung für die Einheit nicht unterbrochen Die Einheit kann auch mit mehreren Netzkabeln ausgestattet sein Um die Stromversorgung für die Einheit vollständig zu unterbrechen müssen alle zum Gerät führenden Netzkabel vom Netz getrennt werden 1 2 18 ThinkCentre M75nHardware Maintenance Manual ...

Page 25: ...Chapter 1 Important safety information 19 ...

Page 26: ...COLO La corrente elettrica proveniente dai cavi di alimentazione del telefono e di comunicazione può essere pericolosa Per evitare il rischio di scosse elettriche 20 ThinkCentre M75nHardware Maintenance Manual ...

Page 27: ...chiature 2 Innanzitutto collegare tutti i cavi alle unità 3 Collegare i cavi di segnale ai connettori 4 Collegare i cavi di alimentazione alla presa 5 Accendere l unità 1 SPEGNERE le apparecchiature 2 Innanzitutto rimuovere i cavi di alimentazione dalla presa 3 Rimuovere i cavi di segnale dai connettori 4 Rimuovere tutti i cavi dalle unità ATTENZIONE Quando si sostituisce la batteria al litio util...

Page 28: ...segue Aprendo l unità vengono emesse radiazioni laser Non fissare il fascio non guardarlo direttamente con strumenti ottici ed evitare l esposizione al fascio 18 kg 32 kg 55 kg ATTENZIONE Prestare attenzione nel sollevare l apparecchiatura ATTENZIONE Il pulsante di controllo dell alimentazione presente sull unità e l interruttore dell alimentatore non disattivano l alimentazione corrente fornita a...

Page 29: ...Chapter 1 Important safety information 23 ...

Page 30: ...ión mantenimiento o reconfiguración de este producto durante una tormenta eléctrica Conecte todos los cables de alimentación a tomas de corriente debidamente cableadas y conectadas a tierra Cualquier equipo que se conecte a este producto también debe conectarse a tomas de corriente debidamente cableadas Siempre que sea posible utilice una sola mano para conectar o desconectar los cables de señal 2...

Page 31: ...ispositivos PRECAUCIÓN Cuando sustituya una batería de litio utilice solamente una batería número de pieza 45C1566 u otra de tipo equivalente recomendada por el fabricante Si su sistema dispone de un módulo que contiene una batería de litio reemplácelo sólo con el mismo tipo de módulo del mismo fabricante La batería contiene litio y puede explotar si no se utiliza manipula o desecha correctamente ...

Page 32: ...pte procedimientos seguros al levantar el equipo PRECAUCIÓN El botón de control de alimentación del dispositivo y el interruptor de alimentación de la fuente de alimentación no desconectan la corriente eléctrica suministrada al dispositivo Además el dispositivo podría tener más de un cable de alimentación Para suprimir toda la corriente eléctrica del dispositivo asegúrese de que todos los cables d...

Page 33: ... the symptoms change Replace only the FRU that changed the symptoms Strategy for replacing a hard disk drive or a solid state drive Always try to run a low level format operation before replacing a hard disk drive or a solid state drive This will cause all customer data on the drive to be lost Ensure that the customer has a current backup of the data before you perform this task Attention The driv...

Page 34: ...ated between Lenovo and the customer A unique MTM consists of a 4 character MT a 4 character model and a numeric 2 character country code is provided to the customer to place orders example 20AA000955 The country code assigned is numeric and does not designate a specific country or region The custom model factsheet for the MTM indicates which country the special bid MTM is set up for Special bid o...

Page 35: ...Chapter 3 Product overview Top Fan models Fanless models 1 ThinkCentre LED This indicator is on when the computer is on Copyright Lenovo 2020 29 ...

Page 36: ... or other devices that use a serial connector 3 USB C 3 2 Gen 2 connector The output voltage and current are 5 V and 0 9 A Transfer data at USB 3 2 speed up to 10 Gbps Connect to USB C accessories to help expand your computer functionality To purchase USB C accessories go to https www lenovo com accessories 4 USB 2 0 connector Connect USB compatible devices such as a USB keyboard USB mouse USB sto...

Page 37: ... accessories to help expand your computer functionality To purchase USB C accessories go to https www lenovo com accessories 5 USB 2 0 connector Connect USB compatible devices such as a USB keyboard USB mouse USB storage device or USB printer This connector supports the smart power on feature 6 Ethernet connector Connect to a local area network LAN When the green indicator is on the computer is co...

Page 38: ...s 1 VESA threaded holes Connect the matched DIN rail bracket power adapter bracket or VESA mount bracket with the matched screws M3 x 4 mm x 3 pcs when you install the computer on a wall 32 ThinkCentre M75nHardware Maintenance Manual ...

Page 39: ...in menu on the display If you did not receive the correct response proceed to step 6 on page 33 If you do receive the correct response proceed to step 7 on page 33 6 Look at the following conditions and follow the instructions If you hear beep codes during POST go to Beep symptoms on page 35 If the computer displays a POST error go to POST error codes on page 36 If the computer hangs and no error ...

Page 40: ...most likely cause is listed first Always begin with Service checkout on page 33 This index can also be used to help you decide which FRUs to have available when servicing a computer If you are unable to correct the problem using this index go to Undetermined problems on page 39 Notes The Symptom to FRU index is not specific to any machine type and are applicable to all ThinkCentre computers If you...

Page 41: ... without sound during POST The following table describes the beep symptoms Beep symptom FRU Action 2 short beeps common POST error Common POST error code See the detailed failure information in POST error codes on page 36 3 short and 1 long beeps DRAM memory error Perform the following actions in order 1 Make sure that the memory modules are properly seated in the memory slots 2 Replace the memory...

Page 42: ...fan failure Auxiliary fan failure ODD fan failure This error message is displayed when a fan fails and the system might be overheating Press F10 to exit 0211 Keyboard not found This error message is displayed when no keyboard is detected 0164 Memory configuration change has occurred This error message is displayed when the memory size is changed Press F10 to exit 1762 Storage device configuration ...

Page 43: ...erver 1 Ensure that the network is in startup sequence as the first device or the first device after diskette 2 Ensure that the network adapter is enabled for RPL 3 Network adapter Advise network administrator of new MAC address Computer will not perform a Wake On LAN if applicable 1 Check the power supply and signal cable connections to the network adapter 2 Ensure that the operating system setti...

Page 44: ... Power on indicator or hard disk drive in use light not on but computer works correctly 1 Power switch LED assembly 2 System Board Printer problems 1 Printer 2 System Board Program loads from the hard disk with a known good diagnostics diskette in the first 3 5 inch diskette drive 1 Run the Setup Utility program and check the Startup sequence 2 Diskette Drive 3 Diskette Drive Cable 4 System Board ...

Page 45: ...e following components if installed one at a time a External devices modem printer or mouse b Any adapters c Memory modules d Extended video memory e External Cache f External Cache RAM g Hard disk drive h Diskette drive 3 Turn on the computer to retest the system 4 Repeat steps 1 through 3 until you find the failing device or adapter If all devices and adapters have been removed and the problem c...

Page 46: ...40 ThinkCentre M75nHardware Maintenance Manual ...

Page 47: ...rectly c All connected devices that require ac power are connected to properly grounded and working electrical outlets d All connected devices are enabled in UEFI BIOS 2 Use an antivirus program to see if the computer has been infected by a virus If the program detects a virus remove the virus 3 Go to Troubleshooting on page 41 and follow the instructions for the type of problem you are experienci...

Page 48: ...correct storage drive or fails to start up Ensure that all storage drive signal cables and power cables are connected correctly Ensure that the storage drive the computer starts up from is listed as the first startup device in UEFI BIOS In rare cases the storage drive with the operating system might get corrupted or damaged In such cases you might need to replace the storage drive If the computer ...

Page 49: ...ts the audio function built into the system board is disabled Therefore you must use the audio connectors on the audio adapter Ensure that the program you are running is designed for use in the Microsoft Windows operating system If the program is designed to run in DOS the program does not use the Windows sound feature The program must be configured to use SoundBlaster Pro or SoundBlaster emulatio...

Page 50: ...mode might degrade performance cause data loss or result in lost connections When a Gigabit Ethernet model computer is used at a speed of 1000 Mbps the Ethernet LAN connection fails or errors occur Connect the network cable to the Ethernet connector using Category 5 wiring and a 100 BASE T hub switch not 100 BASE X The Wake On LAN WOL feature does not work Enable the Wake On LAN feature in UEFI BI...

Page 51: ... then click Enable device 4 Expand Network adapters to display all network devices Right click each Bluetooth device and then click Enable device Turn on the Bluetooth radio 1 Open the Start menu 2 Click Settings Devices Bluetooth other devices 3 Turn on the Bluetooth switch to enable the Bluetooth feature Update or reinstall the Bluetooth driver Sound does not come from the Bluetooth headset or h...

Page 52: ...tart menu 2 Click Windows System File Explorer This PC 3 Right click your C drive and then click Properties 4 Check the amount of free space and then click Disk Cleanup 5 A list of unnecessary file categories is displayed Select the category you want to delete and then click OK Disable some Windows features or remove some unnecessary programs 1 Go to Control Panel and view by large icons or small ...

Page 53: ...aged Try inserting another disc that you know works If you have multiple CD or DVD drives installed or a combination of CD and DVD drives try inserting the disc into the other drive In some cases only one of the drives is connected to the audio subsystem A bootable recovery medium such as the Product Recovery CD cannot be used to start your computer Ensure that the CD or DVD drive is set as the to...

Page 54: ...he power cord to a grounded electrical outlet Turn on the serial device and keep the device online Install any programs supplied with the serial device Refer to the documentation that comes with the serial device for more information If you added one serial connector adapter ensure that the adapter is installed correctly USB device problems Problem Solution A USB device cannot be accessed Connect ...

Page 55: ...ngs that interfere with the correct operation of your computer Lenovo diagnostic tools For information about Lenovo diagnostic tools go to https pcsupport lenovo com lenovodiagnosticsolutions UEFI diagnostic program A UEFI diagnostic program is preinstalled on the computer It enables you to test memory modules and internal storage devices view system information and check and recover bad sectors o...

Page 56: ...ystem Restore Then follow the on screen instructions Restore your files from a backup Note If you use the File History tool to restore your files from a backup ensure that you backed up your data earlier with the tool 1 Go to Control Panel and view by large icons or small icons 2 Click File History Restore personal files Then follow the on screen instructions Reset your computer In the resetting p...

Page 57: ...e with capacity of at least 16 GB The actual USB capacity required depends on the size of the recovery image 3 Connect the prepared USB drive to the computer 4 Type recovery in the search box Then click Create a recovery drive 5 Click Yes in the User Account Control window to allow the Recovery Media Creator program to start 6 In the Recovery Drive window follow the on screen instructions to creat...

Page 58: ...t lenovo com and select the entry for your computer Then follow the on screen instructions to download and install necessary drivers and software From Windows Update Note The device drivers provided by Windows Update might not be tested by Lenovo It is recommended that you get device drivers from Lenovo 1 Open the Start menu 2 Click Settings Update Security Windows Update 3 Follow the on screen in...

Page 59: ...ansion slot cover or other unpainted metal surface on the computer for at least two seconds This reduces static electricity from the package and your body before you install or replace a new part When possible remove the new part from the static protective package and install it directly in the computer without setting the part down When this is not possible place the static protective package on ...

Page 60: ...hemselves or by trained service technicians at an additional cost Optional service CRUs Refer to parts that can be installed or replaced by customers with a greater skill level Trained service technicians can also provide service to install or replace the parts under the type of warranty designated for the customer s machine FRUs Refer to parts that must be installed or replaced only by trained se...

Page 61: ...on such as the FRU part numbers and supported computer models go to http www lenovo com serviceparts lookup Major FRUs and CRUs fanless models Your computer contains the following types of CRUs and FRUs Self service CRUs Refer to parts that can be installed or replaced easily by customer themselves or by trained service technicians at an additional cost Optional service CRUs Refer to parts that ca...

Page 62: ...r Yes No 2 Thermal pad No No 3 Chassis No No 4 Wi Fi card No Yes 5 M 2 solid state drive Yes No 6 Coin cell battery No No 7 Heat sink No No 8 Right cover No No 9 Wall mount Yes No 10 Power adapter Yes No 11 Power cord Yes No 56 ThinkCentre M75nHardware Maintenance Manual ...

Page 63: ...t Yes No 19 Left cover No No 20 Front Wi Fi antenna cable No No 21 Internal speaker No No 22 Rear Wi Fi antenna cable No No 23 Rear Wi Fi antenna Yes No 24 System board No No 25 Heat sink cover Yes No for selected models For detailed FRU and CRU information such as the FRU part numbers and supported computer models go to http www lenovo com serviceparts lookup Chapter 6 Hardware removal and instal...

Page 64: ...ementary Metal Oxide Semiconductor Recovery jumper 4 Internal speaker connector 5 M 2 solid state drive slot 1 6 M 2 solid state drive slot 2 M 2 SATA solid state drive compatible 7 Wi Fi card slot 8 Cover presence switch connector intrusion switch connector 58 ThinkCentre M75nHardware Maintenance Manual ...

Page 65: ...nd maintain your computer by removing or installing hardware Attention Do not open your computer or attempt any repair before reading and understanding the Chapter 1 Important safety information on page 1 External options You can connect external options to your computer such as external speakers a printer or a scanner For some external options you must install additional software in addition to m...

Page 66: ...following instructions Replacement procedure 1 Remove any media from the drives and turn off all connected devices and the computer 2 Disconnect the power cord from the electrical outlet and disconnect all cables from the computer 3 Remove the power adapter 4 Remove the power cord 60 ThinkCentre M75nHardware Maintenance Manual ...

Page 67: ... rail bracket kit is available only on some models Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions Replacement procedure 1 Remove any media from the drives and turn off all connected devices and the computer 2 Disconnect the power cord from the electrical outlet and disconnect all cables from the computer Chapter 6 Hardware r...

Page 68: ...uter with the DIN rail bracket from the rail 4 Turn over the computer so that the bottom cover is facing up Then remove the DIN rail bracket 5 Install the DIN rail bracket 62 ThinkCentre M75nHardware Maintenance Manual ...

Page 69: ...r with the DIN rail bracket to the rail 8 Reconnect the external cables to the corresponding connectors on the computer and then reconnect the power cord to the electrical outlet Power adapter bracket kit Note The power adapter bracket kit is available only on some models Chapter 6 Hardware removal and installation 63 ...

Page 70: ...evices and the computer 2 Disconnect the power cord from the electrical outlet and disconnect all cables from the computer 3 Remove the screw that secures the power adapter bracket to the wall mount bracket 4 Remove the power adapter bracket from the wall mount bracket 5 Remove the power cord from the power adapter See Power adapter and power cord on page 60 64 ThinkCentre M75nHardware Maintenance...

Page 71: ...r the computer so that the bottom cover is facing up 8 Remove the power adapter bracket from the computer 9 Install the power adapter bracket to the computer 10 Turn over the computer so that the bottom cover is facing down Chapter 6 Hardware removal and installation 65 ...

Page 72: ... 13 Install the power adapter bracket to the wall mount bracket 14 Install the screw to secure the power adapter bracket to the wall mount bracket 15 Reconnect the external cables and power adapter to the corresponding connectors on the computer and then reconnect the power cord to the electrical outlet 66 ThinkCentre M75nHardware Maintenance Manual ...

Page 73: ...edia from the drives and turn off all connected devices and the computer 2 Disconnect the power cord from the electrical outlet and disconnect all cables from the computer 3 Remove the screw that secures the VESA mount bracket 4 Remove the VESA mount bracket from the wall mount bracket 5 Turn over the computer so that the bottom cover is facing up 6 Remove the VESA mount bracket from the computer ...

Page 74: ...nect the external cables and power adapter to the corresponding connectors on the computer and then reconnect the power cord to the electrical outlet Rear Wi Fi antenna Note The rear Wi Fi antenna is available only on some models Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions 68 ThinkCentre M75nHardware Maintenance Manual ...

Page 75: ...ter 3 Remove the rear Wi Fi antenna 4 Install the rear Wi Fi antenna 5 Reconnect the external cables and power adapter to the corresponding connectors on the computer and then reconnect the power cord to the electrical outlet Bottom cover Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions Chapter 6 Hardware removal and installat...

Page 76: ...k any locking device that secures the computer cover 4 Remove the bracket if any See DIN rail bracket kit on page 61 Power adapter bracket kit on page 63 or VESA mount bracket kit on page 67 5 Turn over the computer so that the bottom cover is facing up 6 Remove the bottom cover 7 Install the bottom cover 8 Turn over the computer so that the bottom cover is facing down 9 Reinstall the bracket you ...

Page 77: ...age 1 and print the following instructions Replacement procedure 1 Turn over the computer so that the bottom cover is facing up 2 Remove the bottom cover See Bottom cover on page 69 3 Remove the Wi Fi card 4 Install the Wi Fi card 5 Reinstall the removed parts Turn over the computer so that the bottom cover is facing down 6 Reconnect the external cables and power adapter to the corresponding conne...

Page 78: ...access the M 2 solid state drive peel off the thermal pad first 4 Install an M 2 solid state drive For more information about the corresponding slot for the M 2 solid state drive see System board on page 58 Cover the M 2 solid state drive with a thermal pad if you have removed one 5 Reinstall the removed parts Turn over the computer so that the bottom cover is facing down 6 Reconnect the external ...

Page 79: ...ttom cover is facing up 2 Remove the bottom cover See Bottom cover on page 69 3 Release the retaining latch that secures the rear I O bracket to the chassis 4 Turn over the computer so that the computer cover is facing up 5 Remove the computer cover and the rear I O bracket 6 Turn over the computer cover and the rear I O bracket so that the computer cover is facing down Chapter 6 Hardware removal ...

Page 80: ...latches on the computer cover into the corresponding holes in the rear I O bracket 9 Install the computer cover to the rear I O bracket 10 Turn over the computer cover and the rear I O bracket so that the computer cover is facing up 74 ThinkCentre M75nHardware Maintenance Manual ...

Page 81: ...and print the following instructions Replacement procedure 1 Turn over the computer so that the bottom cover is facing up 2 Remove the bottom cover See Bottom cover on page 69 3 Turn over the computer so that the computer cover is facing up 4 Remove the computer cover and the rear I O bracket See Computer cover and rear I O bracket on page 73 5 Disconnect the coin cell battery cable from the coin ...

Page 82: ...you start read Chapter 1 Important safety information on page 1 and print the following instructions Replacement procedure 1 Turn over the computer so that the bottom cover is facing up 2 Remove the bottom cover See Bottom cover on page 69 3 Turn over the computer so that the computer cover is facing up 4 Remove the computer cover and the rear I O bracket See Computer cover and rear I O bracket on...

Page 83: ...rtant safety information on page 1 and print the following instructions Replacement procedure 1 Turn over the computer so that the bottom cover is facing up 2 Remove the bottom cover See Bottom cover on page 69 3 Turn over the computer so that the computer cover is facing up 4 Remove the computer cover and the rear I O bracket See Computer cover and rear I O bracket on page 73 5 Disconnect the int...

Page 84: ... following instructions The heat sink might be very hot Before you open the computer cover turn off the computer and wait several minutes until the computer is cool Replacement procedure 1 Turn over the computer so that the bottom cover is facing up 2 Remove the bottom cover See Bottom cover on page 69 3 Turn over the computer so that the computer cover is facing up 4 Remove the computer cover and...

Page 85: ...d Chapter 1 Important safety information on page 1 and print the following instructions 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 Replacement procedure 1 Remove the bottom cover See Bot...

Page 86: ...e connections and then disconnect all cables from the system board See System board on page 58 4 Remove the two screws that secure the system board and then carefully lift the system board out of the chassis Note Carefully handle the system board by its edges 5 Install the new system board into the chassis by aligning the two screw holes in the new system board with the corresponding mounting stud...

Page 87: ...pter 1 Important safety information on page 1 and print the following instructions Replacement procedure 1 Turn over the computer so that the bottom cover is facing up 2 Remove the bottom cover See Bottom cover on page 69 3 To get access to the front Wi Fi antenna and cable remove the following parts if any a Wi Fi card on page 71 b M 2 solid state drive on page 72 c Computer cover and rear I O br...

Page 88: ...nformation on page 1 and print the following instructions Replacement procedure 1 Remove the rear Wi Fi antenna See Rear Wi Fi antenna on page 68 2 Turn over the computer so that the bottom cover is facing up 3 Remove the bottom cover See Bottom cover on page 69 4 To get access to the rear Wi Fi antenna cable remove the following parts if any a Wi Fi card on page 71 b M 2 solid state drive on page...

Page 89: ...ll disconnected cables to the computer 8 Turn over the computer so that the bottom cover is facing down Removing and installing hardware fanless models This section provides instructions on how to remove and install hardware for your computer You can expand the capabilities of your computer and maintain your computer by removing or installing hardware Attention Do not open your computer or attempt...

Page 90: ...Note The power adapter and power cord are available only on some models Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions Avoid contact with the hot computer During operation the computer becomes hot enough to burn the skin Before you touch the computer turn off the computer disconnect power and wait approximately 30 minutes fo...

Page 91: ...4 Remove the power cord 5 Install the power cord 6 Install the power adapter Chapter 6 Hardware removal and installation 85 ...

Page 92: ...gh to burn the skin Before you touch the computer turn off the computer disconnect power and wait approximately 30 minutes for the computer to cool Replacement procedure 1 Remove any media from the drives and turn off all connected devices and the computer 2 Disconnect the power cord from the electrical outlet and disconnect all cables from the computer 3 Remove the heat sink cover 4 Install the h...

Page 93: ...er disconnect power and wait approximately 30 minutes for the computer to cool Replacement procedure 1 Remove any media from the drives and turn off all connected devices and the computer 2 Disconnect the power cord from the electrical outlet and disconnect all cables from the computer 3 Remove the computer with the DIN rail bracket from the rail 4 Remove the heat sink cover if any See Heat sink c...

Page 94: ... Install the DIN rail bracket 7 Reinstall all removed parts 8 If you have not installed the rail install it to a place where you want to mount the computer 88 ThinkCentre M75nHardware Maintenance Manual ...

Page 95: ...print the following instructions Avoid contact with the hot computer During operation the computer becomes hot enough to burn the skin Before you touch the computer turn off the computer disconnect power and wait approximately 30 minutes for the computer to cool Replacement procedure 1 Remove any media from the drives and turn off all connected devices and the computer 2 Disconnect the power cord ...

Page 96: ... adapter bracket from the wall mount bracket 6 Remove the power cord from the power adapter See Power adapter and power cord on page 84 7 Remove the power adapter from the power adapter bracket 8 Turn over the computer so that the bottom cover is facing up 90 ThinkCentre M75nHardware Maintenance Manual ...

Page 97: ...acket to the computer 11 Turn over the computer so that the bottom cover is facing down 12 Install the power adapter into the power adapter bracket 13 Install the power cord to the power adapter See Power adapter and power cord on page 84 Chapter 6 Hardware removal and installation 91 ...

Page 98: ...te The VESA mount bracket kit is available only on some models Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions Avoid contact with the hot computer During operation the computer becomes hot enough to burn the skin Before you touch the computer turn off the computer disconnect power and wait approximately 30 minutes for the com...

Page 99: ...nk cover if any See Heat sink cover on page 86 4 Remove the screw that secures the VESA mount bracket 5 Remove the VESA mount bracket from the wall mount bracket 6 Turn over the computer so that the bottom cover is facing up 7 Remove the VESA mount bracket from the computer Chapter 6 Hardware removal and installation 93 ...

Page 100: ...ESA mount bracket to the wall mount bracket 11 Reinstall all removed parts if any 12 Reconnect the external cables and power adapter to the corresponding connectors on the computer and then reconnect the power cord to the electrical outlet I O box Notes The I O box is available only on some models 94 ThinkCentre M75nHardware Maintenance Manual ...

Page 101: ...he computer turn off the computer disconnect power and wait approximately 30 minutes for the computer to cool Replacement procedure 1 Remove any media from the drives and turn off all connected devices and the computer 2 Disconnect the power cord from the electrical outlet and disconnect all cables from the computer and the I O box 3 Remove the heat sink cover if any See Heat sink cover on page 86...

Page 102: ...read Chapter 1 Important safety information on page 1 and print the following instructions Avoid contact with the hot computer During operation the computer becomes hot enough to burn the skin Before you touch the computer turn off the computer disconnect power and wait approximately 30 minutes for the computer to cool Replacement procedure 1 Remove any media from the drives and turn off all conne...

Page 103: ... power adapter to the corresponding connectors on the computer and then reconnect the power cord to the electrical outlet Bottom cover Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions Chapter 6 Hardware removal and installation 97 ...

Page 104: ...rail bracket kit on page 87 VESA mount bracket kit on page 92 and Power adapter bracket kit on page 89 5 Turn over the computer so that the bottom cover is facing up 6 Remove the bottom cover 7 Install the bottom cover 8 Turn over the computer so that the bottom cover is facing down 9 Reinstall all removed parts if any 10 Reconnect the external cables and power adapter to the corresponding connect...

Page 105: ...om cover is facing up 2 Remove the bottom cover See Bottom cover on page 97 3 Remove the Wi Fi card Note Pay attention not to get the backup washer under the Wi Fi card lost 4 Install the Wi Fi card 5 Reinstall all removed parts Turn over the computer so that the bottom cover is facing down 6 Reconnect the external cables and power adapter to the corresponding connectors on the computer and then r...

Page 106: ...ouch the computer turn off the computer disconnect power and wait approximately 30 minutes for the computer to cool Replacement procedure 1 Turn over the computer so that the bottom cover is facing up 2 Remove the bottom cover See Bottom cover on page 97 3 Remove an M 2 solid state drive Note A thermal pad might cover the M 2 solid state drive To access the M 2 solid state drive peel off the therm...

Page 107: ... Important safety information on page 1 and print the following instructions Avoid contact with the hot computer During operation the computer becomes hot enough to burn the skin Before you touch the computer turn off the computer disconnect power and wait approximately 30 minutes for the computer to cool Replacement procedure 1 Turn over the computer so that the bottom cover is facing up 2 Remove...

Page 108: ...urn over the system board so that the coin cell battery is facing up 8 Remove the coin cell battery 9 Install the new coin cell battery on the new system board 10 Turn over the system board so that the coin cell battery is facing down 102 ThinkCentre M75nHardware Maintenance Manual ...

Page 109: ...er and front antenna cable Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions Avoid contact with the hot computer During operation the computer becomes hot enough to burn the skin Before you touch the computer turn off the computer disconnect power and wait approximately 30 minutes for the computer to cool Replacement procedure ...

Page 110: ...6 Remove the left cover 7 Remove the front antenna cable 8 Install the front antenna cable 104 ThinkCentre M75nHardware Maintenance Manual ...

Page 111: ... the hot computer During operation the computer becomes hot enough to burn the skin Before you touch the computer turn off the computer disconnect power and wait approximately 30 minutes for the computer to cool Replacement procedure 1 Turn over the computer so that the bottom cover is facing up 2 Remove the bottom cover See Bottom cover on page 97 3 Remove the M 2 solid state drives See M 2 solid...

Page 112: ...u start read Chapter 1 Important safety information on page 1 and print the following instructions Avoid contact with the hot computer During operation the computer becomes hot enough to burn the skin Before you touch the computer turn off the computer disconnect power and wait approximately 30 minutes for the computer to cool Replacement procedure 1 Turn over the computer so that the bottom cover...

Page 113: ... hole used to hold the cable and install the internal speaker 10 Reinstall all removed parts Then reconnect the power adapter and all disconnected cables to the computer Rear antenna cable Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions Avoid contact with the hot computer During operation the computer becomes hot enough to bu...

Page 114: ...rd See System board and coin cell battery on page 101 7 Remove the rear antenna cable 8 Install the rear antenna cable 9 Reinstall all removed parts Turn over the computer so that the bottom cover is facing down Then reconnect the power adapter and all disconnected cables to the computer Heat sink Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the fol...

Page 115: ...emove the Wi Fi card See Wi Fi card on page 98 5 Remove the system board See System board and coin cell battery on page 101 6 Remove the left cover See Left cover and front antenna cable on page 103 7 Remove the right cover See Right cover on page 105 8 Remove the internal speaker See Internal speaker on page 106 9 Remove the rear antenna cable See Rear antenna cable on page 107 10 Remove the heat...

Page 116: ...110 ThinkCentre M75nHardware Maintenance Manual ...

Page 117: ... computer and the content of the manual at any time without additional notice The software interface and function and hardware configuration described in the manuals included with your computer might not match exactly the actual configuration of the computer that you purchase For the configuration of the product refer to the related contract if any or product packing list or consult the distributo...

Page 118: ...nt at any time without notice For the latest information or any questions or comments contact or visit the Lenovo Web site https support lenovo com Trademarks LENOVO LENOVO logo THINKCENTRE and THINKCENTRE logo are trademarks of Lenovo Intel and Optane are trademarks of Intel Corporation or its subsidiaries in the U S and or other countries Microsoft and Windows are trademarks of the Microsoft gro...

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