Lenovo ThinkCentre M70a Gen 6 Hardware Maintenance Manual
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Lenovo ThinkCentre M70a Gen 6 Hardware Maintenance Manual

Lenovo ThinkCentre M70a Gen 6 Hardware Maintenance Manual

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Hardware Maintenance Manual
ThinkCentre M70a/M90a Gen 6

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  • Page 1 Hardware Maintenance Manual ThinkCentre M70a/M90a Gen 6...
  • Page 2 First Edition (March 2025) © Copyright Lenovo 2025. 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-...

  • Page 3: Table Of Contents

    Basic procedure for resolving computer trademarks ....85 problems ....© Copyright Lenovo 2025...
  • Page 4 Hardware Maintenance Manual...

  • Page 5: About This Manual

    ThinkCentre products, please follow all instructions carefully. 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 Lenovo 2025...
  • Page 6 Hardware Maintenance Manual...

  • Page 7: Chapter 1. Important Safety Information

    Avoid contact with hot components inside the computer. During operation, some components become hot enough to burn the skin. Before you open the computer cover, turn off the computer, disconnect power, and wait approximately 10 minutes for the components to cool. © Copyright Lenovo 2025...

  • Page 8: Electrical Safety

    Electrical safety CAUTION: Electrical current from power, telephone, and communication cables can be hazardous. To avoid personal injury or equipment damage, disconnect the attached power cords, telecommunication systems, networks, and modems before you open the computer covers, unless instructed otherwise in the installation and configuration procedures.

  • Page 9: Safety Inspection Guide

    – Power supply units – Pumps – Blowers and fans – Motor generators and similar units. (This practice ensures correct grounding of the units.) • If an electrical accident occurs: – Use caution; do not become a victim yourself. – Switch off power. –...

  • Page 10: Handling Electrostatic Discharge-Sensitive Devices

    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 difference in charge between objects. Protect against ESD damage by equalizing the charge so that the machine, the part, the work mat, and the person handling the part are all at the same charge.
  • Page 11 • Spanish DANGER Electrical current from power, telephone and communication cables is hazardous. To avoid a shock hazard: • Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration of this product during an electrical storm. • Connect all power cords to a properly wired and grounded electrical outlet. •...
  • Page 12 • Do not remove the covers. Removing the covers of the laser product could result in exposure to hazardous laser radiation. There are no serviceable parts inside the device. • Use of controls or adjustments or performance of procedures other than those specified herein might result in hazardous radiation exposure.
  • Page 13 Chapter 1 Important safety information...
  • Page 14 ≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb) Hardware Maintenance Manual...
  • Page 15 PERIGO A corrente elétrica proveniente de cabos de alimentação, de telefone e de comunicações é perigosa. Para evitar risco de choque elétrico: • Não conecte nem desconecte nenhum cabo ou execute instalação, manutenção ou reconfiguração deste produto durante uma tempestade com raios. •...
  • Page 16 PRECAUCIÓN: Quando produtos a laser (como unidades de CD-ROMs, unidades de DVD-ROM, dispositivos de fibra 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...
  • Page 17 Chapter 1 Important safety information...
  • Page 18 Hardware Maintenance Manual...
  • Page 19 Chapter 1 Important safety information...
  • Page 20 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'effectuez aucune opération d'installation, d'entretien ou de reconfiguration de ce produit au cours d'un orage.
  • Page 21 Connexion Déconnexion 1. Mettez les unités HORS TENSION. 1. Mettez les unités HORS TENSION. 2. Commencez par brancher tous les cordons sur les 2. Débranchez les cordons d'alimentation des prises. unités. 3. Débranchez les câbles d'interface des connecteurs. 3. Branchez les câbles d'interface sur des 4.
  • Page 22 ≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb) ATTENTION: Soulevez la machine avec précaution. ATTENTION: L'interrupteur de contrôle d'alimentation de l'unité et l'interrupteur dubloc d'alimentation ne coupent pas le courant électrique alimentantl'unité. En outre, le système peut être équipé de plusieurs cordonsd'alimentation.
  • Page 23 • Geräte niemals einschalten, wenn Hinweise auf Feuer, Wasser oder Gebäudeschäden vorliegen. • Die Verbindung zu den angeschlossenen Netzkabeln, Telekommunikationssystemen, Netzwerken und Modems ist vor dem Öffnen des Gehäuses zu unterbrechen, sofern in den Installations- und Konfigurationsprozeduren keine anders lautenden Anweisungen enthalten sind. •...
  • Page 24 Laserstrahlung bei geöffneter Verkleidung. Nicht in den Strahl blicken. Keine Lupen oder Spiegel verwenden. Strahlungsbereich meiden. ≥18 kg ≥32 kg ≥55 kg ACHTUNG: Arbeitsschutzrichtlinien beim Anheben der Maschine beachten. ACHTUNG: Mit dem Netzschalter an der Einheit und am Netzteil wird die Stromversorgung für die Einheit nicht unterbrochen.
  • Page 25 Chapter 1 Important safety information...
  • Page 26 PERICOLO La corrente elettrica proveniente dai cavi di alimentazione, del telefono e di comunicazione può essere pericolosa. Hardware Maintenance Manual...
  • Page 27 Per evitare il rischio di scosse elettriche: • Non collegare o scollegare qualsiasi cavo oppure effettuare l'installazione, la manutenzione o la riconfigurazione del prodotto durante un temporale. • Collegare tutti i fili elettrici a una presa di alimentazione correttamente cablata e dotata di messa a terra.
  • Page 28 • Non rimuovere gli sportelli. L'apertura di un'unità laser può determinare l'esposizione a radiazioni laser pericolose. All'interno dell'unità non vi sono parti su cui effettuare l'assistenza tecnica. • L'utilizzo di controlli, regolazioni o l'esecuzione di procedure non descritti nel presente manuale possono provocare l'esposizione a radiazioni pericolose.
  • Page 29 Chapter 1 Important safety information...
  • Page 30 PELIGRO La corriente eléctrica procedente de cables de alimentación, teléfonos y cables de comunicación puede ser peligrosa. Para evitar el riesgo de descarga eléctrica: • No conecte ni desconecte los cables ni realice ninguna tarea de instalación, mantenimiento o reconfiguración de este producto durante una tormenta eléctrica. •...
  • Page 31 • Siempre que sea posible, utilice una sola mano para conectar o desconectar los cables de señal. • No encienda nunca un equipo cuando hay señales de fuego, agua o daños estructurales. • Desconecte los cables de alimentación, los sistemas de telecomunicaciones, las redes y los módems conectados antes de abrir las cubiertas de los dispositivos, a menos que se indique lo contrario en los procedimientos de instalación y configuración.
  • Page 32 PELIGRO Algunos productos láser tienen incorporado un diodo láser de clase 3A o clase 3B. Tenga en cuenta lo siguiente: Cuando se abre, queda expuesto a radiación láser. No mire directamente al rayo láser, ni siquiera con instrumentos ópticos, y evite exponerse directamente al rayo láser. ≥18 kg ≥32 kg ≥55 kg...

  • Page 33: Chapter 2. Important Service Information

    After replacing the system board, the recommended option is to download the latest UEFI BIOS package from Lenovo Support Web site to bind the model type, serial number, and brand ID of the computer with the new system board. Or use Golden Key U1 tool to bind the new system board. Refer to https:// support.lenovo.com/solutions/ht102004...

  • Page 34: How To Use Error Codes

    Dynamic Configure To Order (CTO) model This model provides the ability for a customer to configure a Lenovo solution from a Web site, and have this configuration sent to fulfillment, where it is built and shipped directly to the customer. The machine label and eSupport will load these products as the 4-character MT, 4-character model, and 2-character country code.

  • Page 35: Chapter 3. Product Overview

    Chapter 3. Product overview Front Description Description Item Item Radar card* (for M90a only) Microphones* Camera activity indicator* Camera shutter* Screen (touch-enabled for selected models) Camera* Microphone mute/unmute indicator* Power indicator * for selected models © Copyright Lenovo 2025...

  • Page 36: Right

    Right Description Description Item Item Microphone mute/unmute switch* PC/monitor mode switch ® ™ USB-C (Thunderbolt 4) connector (for M90a USB-A connector (USB 10Gbps) only) USB-C connector (USB 10Gbps) Headset connector ™ card slot* Power button * for selected models Hardware Maintenance Manual...

  • Page 37: Rear

    Rear Description Description Item Item VESA thread holes* (screws: M4 x 8 mm, 4 USB-A connector (USB 5Gbps) with smart pcs) power-on feature USB-A connector (USB 5Gbps) USB-A connectors (USB 10Gbps) Ethernet connector (1G) ™ HDMI in 1.4/out 2.1 TMDS combo connector ™...
  • Page 38 Hardware Maintenance Manual...

  • Page 39: Chapter 4. Service Checkout And Symptom-To-Fru Index

    • Machine type and model • Processor or hard disk drive upgrades • Failure symptom – Do diagnostics indicate a failure? – What, when, where, single, or multiple systems? – Is the failure repeatable? – Has this configuration ever worked? © Copyright Lenovo 2025...

  • Page 40: Symptom-To-Fru Index

    – If it has been working, what changes were made prior to its failing? – Is this the original reported failure? • Diagnostics version – Type and version level • Hardware configuration – Print (print screen) configuration currently in use –...

  • Page 41: Power Supply Problems

    Error FRU/Action The boot sector on the startup drive is corrupted. The drive must be formatted. Do the following: 1. Attempt to back up the data on the failing hard disk drive. 2. Using the operating system programs, format the hard disk drive.

  • Page 42: Post Error Codes

    POST error codes Each time you turn on the system, it performs a series of tests that check the operation of the system and some options. This series of tests are called the Power-On Self-Test, or POST. POST checks the following operations: •...

  • Page 43: Miscellaneous Error Conditions

    POST error message Description/Action Error code 8998 Not enough shadow RAM resources This error message is displayed for OPTION ROM, not all devices when the shadow RAM resources initialized. Suggest to remove some for option ROM are insufficient. add-on cards, or change to UEFI If the legacy option ROM is mode in BIOS setup.
  • Page 44 Message/Symptom FRU/Action Blank screen except for flashing cursor. 1. System Board 2. Primary Hard Disk Drive 3. Hard Disk Drive Cable Incorrect memory size during POST 1. Run the Memory tests. 2. Memory Module 3. System Board "Insert a Diskette" icon appears with a known-good 1.

  • Page 45: Undetermined Problems

    Message/Symptom FRU/Action Serial or parallel connector device failure (system board 1. External Device Self-Test OK? connector) 2. External Device 3. Cable 4. System Board Serial or parallel connector device failure (adapter 1. External Device Self-Test OK? connector) 2. External Device 3.

  • Page 46: Clear Cmos

    Note: Depending on the computer model, the recovery process will take two to three minutes. 8. Disconnect all power cords from electrical outlets. 9. Move the jumper back to the standard position. 10. Reinstall all the parts that have been removed. Then, reconnect the power cords for the computer and the monitor to electrical outlets.

  • Page 47: Chapter 5. Diagnostics

    4. Run the diagnostic program. 5. Recover your operating system. See “Self-help resources” on page 42. 6. If the problem persists, contact Lenovo. 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 on internal storage devices.

  • Page 48: Lenovo Diagnostic Tools

    If you are unable to isolate and resolve the problem after running the Vantage app, save and print the log files created by the program. You might need the log files when you speak to a Lenovo technical support representative.
  • Page 49 • Setup Guide 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 •...
  • Page 50 Hardware Maintenance Manual...

  • Page 51: Chapter 6. Hardware Removal And Installation

    Common tool Screwdriver: Phillips Head 01 1, Shank length greater than 6 ThinkStation/DT Common tool inches Screwdriver: Phillips Head 02 2, Shank length greater than 6 ThinkStation/SC/DT Common tool inches Screwdriver: Torx Head T5 IdeaPad Common tool © Copyright Lenovo 2025...
  • Page 52 Tool name Specification Product scope Tool type Screwdriver: Torx Head T15 T15, for Chassis outside ThinkStation Common tool Screwdriver: Torx Head T20 T20, Shank length greater than ThinkStation Common tool 6 inches, for heatsink and CPU Screwdriver: Torx Head T30 T30, Shank length greater than ThinkStation Common tool...

  • Page 53: Major Frus And Crus

    • FRUs: Refer to parts that are more complicated to replace and it is recommended that these should be replaced by trained service technicians. If customers elect to replace the FRUs by themselves, we recommend that you ensure the correct instructions provided by Lenovo are carefully followed. Chapter 6...
  • Page 54 Hardware Maintenance Manual...
  • Page 55 Number Description Self-service CRU Optional-service CRU Full-function monitor stand* Tilt-only stand* UltraFlex stand* Camera module* System board shield Cover presence switch (intrusion switch)* ® VESA mount bracket Power connector bracket (for M90a only) Power supply assembly (for M90a only) System board Heat sink kit for NPU card* NPU card* Serial connector board with cable*...

  • Page 56: System Board Illustration

    GPU card* (for selected M90a models only) Gaskets and thermal pads Screws * for selected models For detailed FRU and CRU information, such as the FRU part numbers and supported computer models, go http://www.lenovo.com/serviceparts-lookup System board illustration Description Description Item...

  • Page 57: Removing And Installing Hardware

    Description Description Item Item Speaker connector SD card reader connector M.2 SSD slot M.2 SSD slot (for M90a only) Clear CMOS (Complementary Metal Oxide Semiconductor)/Recovery jumper Removing and installing hardware This section provides instructions on how to remove and install hardware for your computer. Attention: Do not open your computer or attempt any repair before reading and understanding the Chapter 1 “Important safety information”...
  • Page 58 Note: Some computer models might not be shipped with a computer stand. In this case, remove the mylar over the VESA mounting first if you want to install a new computer stand. • Tilt-only stand 1. Remove the stand from the computer. Detach the stand arm from the base if needed. 2.
  • Page 59 2. Connect the stand arm and base of a new stand. Mount the stand on the computer. Note: Some computer models might not be shipped with a computer stand. In this case, remove the mylar over the VESA mounting first if you want to install a new computer stand. Chapter 6 Hardware removal and installation...

  • Page 60: Rear Cover

    Rear cover Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. Before you open the rear cover, turn off the computer and wait several minutes until the computer is cool. For access, do the following: 1.

  • Page 61: System Board Shield

    2. Align a new rear cover to the computer back and install it. System board shield Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts, if any, in order. •...
  • Page 62 • Do not make the internal storage drive subject to physical shocks or vibration. Put the internal storage drive on a soft material, such as cloth, to absorb physical shocks. For access, remove the following parts, if any, in order. •...
  • Page 63 Removal steps for the SSD within a heat sink 1. Remove the screw which secures the heat sink to the system board. Find the screw specification from the following table. Screw Quantity Torque M2 x L4 mm, Ni coated, silver 1.5 ±...

  • Page 64: Memory Module

    Memory module Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts, if any, in order. • “Computer stand (for selected models)” on page 51 • “Rear cover” on page 54 •...

  • Page 65: Vesa Mount Bracket

    VESA mount bracket Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts, if any, in order. • “Computer stand (for selected models)” on page 51 • “Rear cover” on page 54 •...

  • Page 66: Npu Card And Its Heat Sink Kit (For Selected Models)

    For access, do the following. 1. Remove the following parts, if any, in order. • “Computer stand (for selected models)” on page 51 • “Rear cover” on page 54 • “System board shield” on page 55 • “VESA mount bracket” on page 59 2.
  • Page 67 a. Remove two screws that fix the NPU card with its heat sink to the system board. Find the screw specification from the following table. Screw Quantity Torque M2 x L4 mm, Ni coated, silver 1.5 ± 0.2 kgf/cm b. Pull the NPU card with the heat sink away from the M.2 slot on the system board. c.

  • Page 68: Wi-Fi Card And Wi-Fi Card Shield (For Selected Models)

    Wi-Fi card and Wi-Fi card shield (for selected models) Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following. 1. Remove the following parts, if any, in order. • “Computer stand (for selected models)” on page 51 •...

  • Page 69: Side I/O Bezel

    For access, do the following. 1. Remove the following parts, if any, in order. • “Computer stand (for selected models)” on page 51 • “Rear cover” on page 54 • “System board shield” on page 55 2. Locate the SD card reader. The SD card reader is located on the lower left side of the system board. Note: Some models might not be shipped with an SD card reader.

  • Page 70: Serial Connector Board With Cable (For Selected Models)

    2. Install a new side I/O bezel in reverse order. Serial connector board with cable (for selected models) Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts, if any, in order. •...

  • Page 71: System Fan

    2. Install a new serial connector board with cable in reverse order. System fan Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts, if any, in order. • “Computer stand (for selected models)” on page 51 •...

  • Page 72: Camera Module (For Selected Models)

    2. Install a new system fan in reverse order. Camera module (for selected models) Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts, if any, in order. • “Computer stand (for selected models)” on page 51 •...

  • Page 73: Screw Quantity

    2. Remove two screws from the camera module and remove the camera module. Find the screw specification from the following table. Screw Quantity Torque M3 x L4 mm, Ni coated, silver 3.0 ± 0.5 kgf/cm CAUTION: Do not pull out the camera module cable with force; otherwise, the cable may be damaged. 3.

  • Page 74: Power Supply Assembly (For M90A Only)

    3. Install a new camera module in reverse order. Power supply assembly (for M90a only) Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. Although there are no moving parts in the computer after the power cord has been disconnected, the following warnings are required for your safety.

  • Page 75: Power Connector Bracket (For M90A Only)

    Replacement steps 1. Remove the power supply assembly in the following steps. a. Disconnect the power supply assembly cables from the ac-in power connector and the PSU identification connector on the right of the system board. b. Peel off the acetate tape that fixes the power supply assembly cables, and remove the cables from the cable hooks.

  • Page 76: Heat Sink

    Screw Quantity Torque M3 x L4 mm, Ni coated, silver 3.0 ± 0.5 kgf/cm 2. Install a new power connector bracket in reverse order. Heat sink Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. The heat sink might be very hot.
  • Page 77 c. Lift the heat sink away. Notes: • You might have to gently twist the heat sink to free it from the CPU. • Do not touch the thermal grease while handling the heat sink. 2. Install a new heat sink in reverse order. Note: When installing a new heat sink, it’s recommended to clean the old thermal grease on the CPU and apply new thermal grease (TC-5622 or 7783) for 0.8 grams.

  • Page 78: Gpu Card (For Selected Models)

    2. Install a new heat sink in reverse order. Note: When installing a new heat sink, it’s recommended to clean the old thermal grease on the CPU and the GPU and apply new thermal grease (TC-5622 or 7783) for 0.8 grams to the CPU and 0.22 grams to the GPU.

  • Page 79: Cpu

    2. Install a new GPU card in reverse order. Note: When installing a new GPU, it’s recommended to clean the old thermal grease on the heat sink and apply new thermal grease (TC-5622 or 7783) at for 0.22 grams on the top of the GPU. Either too much or too little application of grease can cause a thermal problem due to imperfect contact with a component.

  • Page 80: System Board

    • Touch only the edges of the CPU. Do not touch the gold contacts on the bottom. • Do not drop anything onto the CPU socket while it is exposed. The socket pins must be kept as clean as possible. 2.
  • Page 81 • “M.2 solid-state drive (SSD) (for selected models)” on page 55 • “Memory module” on page 58 • “NPU card and its heat sink kit (for selected models)” on page 60 • “Wi-Fi card and Wi-Fi card shield (for selected models)” on page 62 •...

  • Page 82: Speakers

    3. Carefully check the four corners of the socket cover to ensure that the cover is seated securely. 4. Follow any additional instructions that are included with the replacement part you received. Speakers Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following.

  • Page 83: Wi-Fi Antennas

    Note: The speakers of M70a and M90a are in different lengths. Figure 1. Remove the speakers for M70a models Figure 2. Remove the speakers for M90a models 2. Install new speakers in reverse order. Wi-Fi antennas Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts, if any, in order.

  • Page 84: Main Frame And Lcd Bracket Assembly

    • “Wi-Fi card and Wi-Fi card shield (for selected models)” on page 62 • “SD card reader (for selected models)” on page 62 • “Serial connector board with cable (for selected models)” on page 64 • “System fan” on page 65 •...
  • Page 85 • “Heat sink” on page 70 • “GPU card (for selected models)” on page 72 • “CPU” on page 73 • “System board” on page 74 • “Power supply assembly (for M90a only)” on page 68 • “Power connector bracket (for M90a only)” on page 69 •...

  • Page 86: Lcd Power Cable, Lvds Cable, And Touch Board Cable

    3. Remove five screws from the LCD bracket assembly. Find the screw specification from the following table. Then, lift the LCD bracket while getting the LCD power cable, the LVDS cable, and the touch cable (if available) through the holes in the LCD bracket. Screw Quantity Torque...
  • Page 87 • “M.2 solid-state drive (SSD) (for selected models)” on page 55 • “Memory module” on page 58 • “NPU card and its heat sink kit (for selected models)” on page 60 • “Wi-Fi card and Wi-Fi card shield (for selected models)” on page 62 •...

  • Page 88: Front Decoration Cover And Lcd Panel

    2. Install a new cable in reverse order. Front decoration cover and LCD panel Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following. 1. Remove the following parts, if any, in order. •...
  • Page 89 • “LCD power cable, LVDS cable, and touch board cable” on page 80 2. Locate the front decoration cover. The front decoration cover is a strip cover at the bottom edge of the screen. Note: For models with a non-touch screen, the front decoration cover and the LCD panel are combined as one FRU.
  • Page 90 Hardware Maintenance Manual...

  • Page 91: Appendix A. Notices And Trademarks

    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 92 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.

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