• Depending on the version of operating systems and programs, some user interface instructions might not be applicable to your computer. • Documentation content is subject to change without notice. Lenovo makes constant improvements on the documentation of your computer, including this User Guide. To get the latest documentation, go to: https://pcsupport.lenovo.com...
Page 8
• Transfer data at USB 3.2 speed, up to 5 Gbps. • Connect to USB-C accessories to help expand your computer functionality. To purchase USB-C accessories, go to https://www.lenovo.com/accessories Connect USB-compatible devices, such as a USB keyboard, USB mouse, USB 10. USB 3.2 connectors Gen 1 storage device, or USB printer.
Rear Send audio signals from the computer to external devices, such as powered stereo speakers, headphones, or multimedia keyboards. To connect a stereo system or other external recording device, connect a cable between the audio line-in connector of the device and the audio line-out connector of the computer. 1.
Page 10
Connect to a local area network (LAN). When the green indicator is on, the 8. Ethernet connector computer is connected to a LAN. When the yellow indicator blinks, data is being transmitted. 9. Padlock loop Lock the computer cover through a padlock. Lock the computer cover through an E-lock.
Features and specifications • Width: 92.5 mm (3.6 inches) Dimensions • Height: 339.5 mm (13.4 inches) • Depth: 297.7 mm (11.7 inches) Weight (without the package) Maximum configuration as shipped: 5.3 kg (11.7 lb) 1. Right-click the Start button to open the Start context menu. Hardware configuration 2.
• Card reader* • Memory slots • M.2 solid-state drive slot Expansion • Optical drive* • PCI-Express card slots • Storage drive bay • Bluetooth* Network features • Ethernet LAN • Wireless LAN* * for selected models Statement on USB transfer rate Depending on many factors such as the processing capability of the host and peripheral devices, file attributes, and other factors related to system configuration and operating environments, the actual transfer rate using the various USB connectors on this device will vary and will be slower than the data rate listed...
Windows user interface Change account settings, lock the computer, or sign out from the current account. 1. Account Open the Documents folder, a default folder to save your received files. 2. Documents Open the Pictures folder, a default folder to save your received pictures. 3.
Access Control Panel • Open the Start menu and click Windows System ➙ Control Panel. • Use Windows Search. Launch an app • Open the Start menu and select the app you want to launch. • Use Windows Search. Connect to networks Your computer helps you connect to the world through a wired or wireless network.
Use multimedia Use your computer for business or entertainment with the devices (such as a camera, a monitor, or speakers). Use audio To enhance the audio experience, connect speakers, headphones, or a headset to the audio connector. Adjust the volume 1.
3. Press the card and remove it from your computer. Store the card safely for future use. Use a smart cable clip (for selected models) Note: You can purchase a smart cable clip from Lenovo. M75s Gen 2 User Guide...
Purchase accessories Lenovo has a number of hardware accessories and upgrades to help expand the capabilities of your computer. Options include memory modules, storage devices, network cards, power adapters, keyboards, mice, and more.
Note: You are responsible for evaluating, selecting, and implementing the locking device and security feature. Lenovo makes no comments, judgments, or warranties about the function, quality, or performance of the locking device and security feature. You can purchase computer locks from Lenovo.
E-lock (for selected models) Your computer might have a security lock solution installed to protect the computer from unauthorized tampering of the internal components. Using the E-Lock, you can mechanically lock or unlock the computer cover. To enable or disable the E-Lock: 1.
• If the supervisor password is forgotten, it might not be removed by clearing CMOS depending on your BIOS settings. • If the hard disk password is forgotten, Lenovo cannot remove the password or recover data from the storage drive.
2. Click Windows Defender Firewall, and then follow the on-screen instructions. Use computrace Agent software embedded in firmware (for selected models) The Computrace Agent software is an IT asset management and computer theft recovery solution. The software detects if changes have been made on the computer, such as hardware, software, or the computer call-in location.
2. Enter the BIOS menu, save and then exit. Use Smart USB Protection The Smart USB Protection function is a security function that helps prevent data from being copied from the computer to USB storage devices connected to the computer. You can set the Smart USB Protection function to one of the following modes: •...
Change the display mode of UEFI BIOS You can use UEFI BIOS in the graphic mode or the text mode according to your needs. To change the display mode of UEFI BIOS: 1. Restart the computer. When the logo screen is displayed, press F1 or Fn+F1. 2.
4. Press F10 or Fn+F10 to save the changes and exit. Enable or disable the ErP LPS compliance mode Lenovo computers meet the eco-design requirements of the ErP Lot 3 regulation. For more information, go https://www.lenovo.com/us/en/compliance/eco-declaration You can enable the ErP LPS compliance mode to reduce the consumption of electricity when the computer is off or in sleep mode.
Microsoft constantly makes updates to the Windows 10 operating system. Before installing a particular Windows 10 version, check the compatibility list for the Windows version. For details, go to: https://support.lenovo.com/us/en/solutions/windows-support To change the BIOS settings: 1. Restart the computer. When the logo screen is displayed, press F1 or Fn+F1.
Open the Vantage app to check the available update packages. If the latest UEFI BIOS update package is available, follow the on-screen instructions to download and install the package. • From the Lenovo Support Web site: 1. Go to https://pcsupport.lenovo.com 2.
Page 32
3. Move the jumper from the standard position to the maintenance position. 4. Reconnect the power cords for the computer and the monitor to electrical outlets. 5. Turn on the computer and the monitor. When the computer beeps, wait for approximately 10 seconds. 6.
3. See Chapter 6 “Troubleshooting, diagnostics, and recovery” on page 27 to resolve the problem you are experiencing, run the diagnostic program, and recover your operating system. 4. If the problem persists, contact Lenovo. See Chapter 8 “Help and support” on page 55. Troubleshooting Use the troubleshooting information to find solutions to problems that have definite symptoms.
Audio problems Problem Solution • If you are using powered external speakers that have an On/Off control, ensure that: – The On/Off control is set to the On position. – The speaker power cable is connected to a properly grounded, functional ac electrical outlet.
Page 35
Problem Solution • Connect the cable from the Ethernet connector to the RJ45 connector of the hub. • Enable the Ethernet LAN feature in UEFI BIOS. • Enable the Ethernet LAN adapter. 1. Go to Control Panel and view by large icons or small icons. 2.
Page 36
Problem Solution • Enable the Bluetooth feature in UEFI BIOS. • Enable all Bluetooth devices. 1. Right-click the Start button to open the Start context menu. 2. Click Device Manager. Type the administrator password or provide confirmation if prompted. 3. Expand Bluetooth to display all Bluetooth devices. Right-click each Bluetooth device, and then click Enable device.
Performance problems Problem Solution Note: Depending on the volume of the storage drives and amount of data stored on the storage drives, the disk-defragmentation process might take up to several hours. 1. Close any open programs and windows. 2. Open the Start menu. Excessive fragmented files exist on the 3.
Storage drive problems Problem Solution • Ensure that the signal cables and power cables for all the storage drives are connected correctly. • Ensure that the computer is configured correctly to support the storage drives. Some or all storage drives are missing from –...
Problem Solution • Disable any background programs, such as AntiVirus or Desktop The playback is slow or choppy. Themes. • Ensure that video resolution is less than 1152 x 864 pixels. • Ensure that the disc is in the drive with the shiny side of the disc facing down.
Use diagnostic solutions to test hardware components and report operating-system-controlled settings 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 Recovery This section introduces the recovery information of the Windows 10 operating system. Ensure that you read and follow the on-screen recovery instructions.
Windows recovery programs are damaged. If you did not create a recovery USB drive as a precautionary measure, you can contact Lenovo Customer Support Center and purchase one from Lenovo. For a list of the Lenovo Support phone numbers for your country or region, go to: https://pcsupport.lenovo.com/supportphonelist Create a recovery USB drive Attention: The creation process deletes anything stored on the USB drive.
• 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.
If you intend on installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request. You might be required to return the defective part that is replaced by the CRU.
Optional-service CRUs • Coin-cell battery • E-lock* • Power supply assembly * for selected models Replace a CRU Follow the replacement procedure to replace a CRU. Vertical stand Prerequisite Before you start, read Appendix A “Important safety information” on page 59 and print the following instructions.
Before you open the computer cover, turn off the computer and wait several minutes until the computer is cool. For access, do the following: 1. Remove any media from the drives and turn off all connected devices and the computer. 2.
Replacement procedure Optical drive Prerequisite Before you start, read Appendix A “Important safety information” on page 59 and print the following instructions. For access, do the following: 1. Remove the computer cover. See “Computer cover” on page 38. 2. Disconnect the signal and power cable from the optical drive. M75s Gen 2 User Guide...
Drive bay assembly Prerequisite Before you start, read Appendix A “Important safety information” on page 59 and print the following instructions. For access, remove the following parts in order: • “Computer cover” on page 38 • “Front bezel” on page 39 Replacement procedure M75s Gen 2 User Guide...
Hard disk drive Prerequisite Before you start, read Appendix A “Important safety information” on page 59 and print the following instructions. Attention: The internal storage drive is sensitive. Inappropriate handling might cause damage and permanent loss of data. When handling the internal storage drive, observe the following guidelines: •...
Page 50
Removal steps for 2.5-inch primary hard disk drive Remove the storage converter with the 2.5-inch primary storage drive. See “3.5-inch primary hard disk drive” on page 43. M75s Gen 2 User Guide...
Page 51
Removal steps for 2.5-inch secondary hard disk drive For access, do the following: 1. Remove the following parts in order, if any: • “Computer cover” on page 38 • “Front bezel” on page 39 • “Optical drive” on page 40 •...
M.2 solid-state drive and heat sink Prerequisite Before you start, read Appendix A “Important safety information” on page 59 and print the 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.
Page 53
• For computers with the heat sink for the M.2 solid-state drive, do one of the following depending on the computer model: – Type 1 Note: Remove the film that covers the thermal pad (if any) when installing the M.2 solid-state drive and the heat sink.
Page 54
Note: Remove the film that covers the thermal pad (if any) when installing the M.2 solid-state drive and the heat sink. – Type 3 Note: Remove the film that covers the thermal pad (if any) when installing the M.2 solid-state drive and the heat sink.
M.2 solid-state drive bracket Prerequisite Before you start, read Appendix A “Important safety information” on page 59 and print the following instructions. For access, remove the following parts in order, if any: • “Computer cover” on page 38 • “Front bezel” on page 39 •...
Page 56
For access, remove the following parts in order, if any: • “Computer cover” on page 38 • “Front bezel” on page 39 • “Drive bay assembly” on page 42 Replacement procedure Note: During the installation, ensure that you align the memory module to the slot and press down on both ends until the latches are fully engaged with a click.
PCI-Express card Prerequisite Before you start, read Appendix A “Important safety information” on page 59 and print the following instructions. For access, remove the computer cover. See “Computer cover” on page 38. Removal steps Note: Remove any PCI-Express connector cables that impede the installation of PCI-Express cards. Coin-cell battery Prerequisite Before you start, read Appendix A “Important safety information”...
Removal steps Notes: • Reset the system date and time in the UEFI BIOS menu. • To dispose of the coin-cell battery, refer to the “Lithium coin-cell battery notice” in the Safety and Warranty Guide. Power supply assembly Prerequisite Before you start, read Appendix A “Important safety information” on page 59 and print the following instructions.
2. Disconnect the power supply assembly cables from the system board. Removal steps E-lock Prerequisite Before you start, read Appendix A “Important safety information” on page 59 and print the following instructions. For access, do the following: 1. Remove the following parts in order, if any: •...
• Setup Guide screen instructions to filter out the documentation you want. • This User Guide • Regulatory Notice Lenovo Support Web site with the latest support information of the following: • Drivers and software • Diagnostic solutions https://pcsupport.lenovo.com • Product and service warranty •...
Call Lenovo If you have tried to correct the problem yourself and still need help, you can call Lenovo Customer Support Center. Before you contact Lenovo Prepare the following before you contact Lenovo: 1. Record the problem symptoms and details: •...
• Lenovo hardware repair - If the problem is determined to be caused by Lenovo hardware under warranty, trained service personnel are available to provide the applicable level of service.
Page 66
Note: If you notice these conditions with a product (such as an extension cord) that is not manufactured for or by Lenovo, stop using that product until you can contact the product manufacturer for further instructions, or until you get a suitable replacement.
Page 67
Do not use them with any other products. For your safety, Lenovo provides a power cord with a grounded attachment plug to use with this product. To avoid electrical shock, always use the power cord and plug with a properly grounded outlet.
Page 68
If you intend to use your PC in a country or region that is different from your ordering location, please purchase an additional Lenovo power cord for the country or region where the PC will be used. Refer to the power cord guide provided in our Web site, , for details.
Page 69
Plugs and outlets DANGER If a receptacle (power outlet) that you intend to use with your computer equipment appears to be damaged or corroded, do not use the outlet until it is replaced by a qualified electrician. Do not bend or modify the plug. If the plug is damaged, contact the manufacturer to obtain a replacement.
Page 70
If the coin-cell battery is not a CRU, do not attempt to replace the coin-cell battery. Replacement of the battery must be done by a Lenovo-authorized repair facility or technician. The Lenovo-authorized repair facilities or technicians recycle Lenovo batteries according to local laws and regulations.
Page 71
computer, power adapter, and many accessories produce some heat during normal operation. Extended contact with the body could cause discomfort or, potentially, a skin burn. • Do not charge the battery or operate your computer, power adapter, or accessories near flammable materials or in explosive environments.
Page 72
DANGER Connect and disconnect cables as described in the following procedures when installing, moving, or opening covers on this product or attached devices. To connect: To disconnect: 1. Turn everything OFF. 1. Turn everything OFF. 2. First, attach all cables to devices. 2.
Page 73
Liquid crystal display (LCD) notice DANGER To avoid shock hazards: • Do not remove the covers. • Do not operate this product unless the stand is attached. • Do not connect or disconnect this product during an electrical storm. • The power cord plug must be connected to a properly wired and grounded power outlet. •...
Page 74
2 can be dangerous due to excessive sound pressure levels. If your Lenovo computer came with headphones or earphones in the packaging, as a set, the combination of the headphones or earphones and the computer already complies with the specifications of EN 50332-1. If different headphones or earphones are used, ensure that they comply with EN 50332-1 (Clause 6.5...
Page 75
For tips on how to minimize visual fatigue, please go to to visit https://www.lenovo.com/us/en/safecomp/ “Minimizing Visual Fatigue”. Tip-over hazard prevention notice The computer may cause harm to children if it is not located in an appropriate place. Follow the tips below to protect children from harm caused by the computer tipping over: •...
Page 76
Static electricity prevention Static electricity, although harmless to you, can seriously damage computer components and options. Improper handling of static-sensitive parts can damage the part. When you unpack an option or CRU, do not open the static-protective packaging containing the part until the instructions direct you to install it. When you handle options or CRUs, or perform any work inside the computer, take the following precautions to avoid static-electricity damage: •...
Page 77
The cause of a problem might be change in hardware, change in software, or any other actions that might have taken place. A log book can help you or a Lenovo technician determine the cause of a problem. • Back up your data on the storage drive regularly. You can restore the storage drive from a backup.
Page 78
Clean the computer surface: Wipe it with a lint-free cloth dampened in mild soap and water. Avoid applying liquids directly to the surface. Clean the keyboard: Wipe the keys one by one with a lint-free cloth dampened in mild soap and water. If you wipe several keys at a time, the cloth might hook onto an adjacent key and possibly damage it.
This chapter provides information about accessibility and ergonomics. Accessibility information Lenovo is committed to providing users who have hearing, vision, and mobility limitations with greater access to information and technology. This section provides information about the ways these users can get the most out of their computer experience.
Page 80
keyboard with all the standard keys. You can select keys using the mouse or another pointing device, or you can tap to select the keys if your computer supports multi-touch screen. • High Contrast High Contrast is a feature that heightens the color contrast of some text and images on your screen. As a result, those items are more distinct and easier to identify.
Page 81
Your computer provides industry-standard connectors that enable you to connect assistive devices. Documentation in accessible formats Lenovo provides electronic documentation in accessible formats, such as properly tagged PDF files or HyperText Markup Language (HTML) files. Lenovo electronic documentation is developed to ensure that visually impaired users can read the documentation through a screen reader.
Page 82
Display: Position the display to maintain a comfortable viewing distance of 510 mm to 760 mm (20 inches to 30 inches). Avoid glare or reflections on the display from overhead lighting or outside sources of light. Keep the display screen clean and set the brightness to levels that enable you to see the screen clearly. Press the brightness control keys to adjust display brightness.
The LLW also is preinstalled on the computer. To access the LLW, go to the following directory: /opt/Lenovo If you cannot view the LLW either from the Web site or from your computer, contact your local Lenovo office or reseller to obtain a printed version of the LLW.
The full text of the system EU declaration of conformity is available at: https://www.lenovo.com/us/en/compliance/eu-doc Lenovo cannot accept responsibility for any failure to satisfy the protection requirements resulting from a non-recommended modification of the product, including the installation of option cards from other manufacturers.
Page 86
Lenovo encourages owners of information technology (IT) equipment to responsibly recycle their equipment when it is no longer needed. Lenovo offers a variety of programs and services to assist equipment owners in recycling their IT products. For information about recycling Lenovo products, go to: https://www.lenovo.com/us/en/compliance/recycling...
Page 87
Collect and recycle a disused Lenovo computer or monitor If you are a company employee and need to dispose of a Lenovo computer or monitor that is the property of the company, you must do so in accordance with the Law for Promotion of Effective Utilization of Resources.
Page 88
If the battery needs to be replaced, contact your place of purchase or contact Lenovo for service. If you need to dispose of a lithium battery, insulate it with vinyl tape, contact your place of purchase or a waste-disposal operator, and follow their instructions.
Page 89
Disposing of battery packs from Lenovo products Your Lenovo device might contain a lithium-ion battery pack or a nickel metal hydride battery pack. You can find details on the battery pack in the product documentation. If you need to dispose of a battery pack, insulate it with vinyl tape, contact Lenovo sales, service, or your place of purchase, or a waste-disposal operator, and follow their instructions.
Page 90
India RoHS RoHS compliant as per E-Waste (Management) Rules. Mainland China RoHS M75s Gen 2 User Guide...
Page 91
Federal Communications Commission (FCC) Supplier’s Declaration of Conformity The following information refers to ThinkCentre M75s Gen 2, machine types: 11JA, 11JB, 11JC, and 11JD. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.
Page 92
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult an authorized dealer or service representative for help. Lenovo is not responsible for any radio or television interference caused by using other than recommended cables and connectors or by unauthorized changes or modifications to this equipment. Unauthorized changes or modifications could void the user’s authority to operate the equipment.
Page 93
Klasse B. Dieses Gerät ist berechtigt, in Übereinstimmung mit dem Deutschen EMVG das EG-Konformitätszeichen - CE - zu führen. Verantwortlich für die Konformitätserklärung nach Paragraf 5 des EMVG ist die Lenovo (Deutschland) GmbH, Meitnerstr. 9, D-70563 Stuttgart. Japan VCCI Class B compliance statement...
Page 94
This product is subject to the United States Export Administration Regulations (EAR) and has an Export Classification Control Number (ECCN) of 5A992.c. It can be re-exported except to any of the embargoed countries in the EAR E1 country list. Lenovo product service information for Taiwan Taiwan precautionary vision statement 警語:使用過度恐傷害視力...
Page 95
Lenovo encourages you to make efficient use of energy an integral part of your day-to-day operations. To help in this endeavor, Lenovo has preset a default power plan. To change the power plan, see “Set the power plan” on page 11.
Lenovo representative for information on the products and services currently available in your area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service that does not infringe any Lenovo intellectual property right may be used instead.
Page 98
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.
Need help?
Do you have a question about the ThinkCentre M75s Gen 2 and is the answer not in the manual?
Questions and answers