Lenovo 3120, 3122, 3128, 3126 manual Screws that secure the heat sink and fan assembly

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1.Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer.

2.Open the computer cover. See “Opening the computer cover” on page 14.

3.Disconnect the heat sink and fan assembly cable from the microprocessor fan connector on the system board. See “Locating parts on the system board” on page 10.

4.Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the system board:

a.Partially remove screw

b.Partially remove screw

1 , then fully remove screw

3 , then fully remove screw

2 , and then fully remove screw

4 , and then fully remove screw

1.

3.

Note: Carefully remove the four screws from the system board to avoid any possible damage to the system board. The four screws cannot be removed from the heat sink and fan assembly.

Figure 29. Screws that secure the heat sink and fan assembly

5.Lift the heat sink and fan assembly with the fan duct off the system board.

Notes:

a.You might have to gently twist the heat sink and fan assembly to free it from the microprocessor.

b.When handling the heat sink and fan assembly, do not touch the thermal grease on the bottom of the heat sink and fan assembly.

34ThinkCentre User Guide

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Contents ThinkCentre User Guide Second Edition December Copyright Lenovo Contents Index Important safety information Iv ThinkCentre User Guide Features Product overviewConnectivity Preinstalled operating system Software overview SpecificationsSoftware provided with your Windows operating system Lenovo ThinkVantage Tools Lenovo Solution Center LocationsLocating connectors and parts on the rear of your computer Front connector, control, and indicator locationsConnector Description If you use speech-recognition software Locating components Locating parts on the system boardLocating internal drives System board part locationsDrive bay locations Installing or replacing hardware Installing or replacing hardwareHandling static-sensitive devices Installing external options Opening the computer coverRemoving and reinstalling the front bezel Removing the front bezelAccessing the system board components and drives What to do nextInstalling or replacing a memory module Removing a memory moduleInstalling or replacing a PCI card Opening the retaining clipsRemoving a PCI card Installing the PCI card Installing or replacing the card reader Installing the card readerInstalling the card reader Installing the screw that secures the card reader Replacing the card reader Installing the card reader Replacing the battery Removing the old battery Replacing the hard disk driveRemoving the hard disk drive Removing the hard disk drive from the bracket Installing the hard disk drive Replacing the optical drivePivoting the optical drive bay Removing the old optical drive Replacing the heat sink and fan assembly Installing a new optical driveScrews that secure the heat sink and fan assembly Removing the heat sink fan duct Replacing the power supply assembly Installing the heat sink fan ductInstalling or replacing hardware Removing the heat sink fan duct Power connectors on the system board Installing the power supply assembly Replacing the microprocessor Accessing the microprocessor Installing or replacing hardware Replacing the internal speaker Removing the front bezel Removing the cover presence switch Removing the internal speaker Installing the new internal speaker Replacing the front audio and USB assembly Reinstalling the cover presence switchRemoving the front audio and USB assembly Replacing the keyboard Replacing the mouseCompleting the parts replacement Mouse connectorsPassword protection Obtaining device drivers Basic security featuresIntegrated cable lock Erasing a lost or forgotten password clearing Cmos Creating and using recovery media Recovery informationCreating recovery media Performing backup and recovery operations Using recovery mediaPerforming a backup operation Performing a recovery operation Using the Rescue and Recovery workspaceUsing a rescue medium Creating and using a rescue mediumCreating a rescue medium Installing or reinstalling device drivers Solving recovery problemsThinkCentre User Guide Using the Setup Utility program Starting the Setup Utility programViewing or changing settings Using passwordsPassword considerations Power-on passwordAdministrator password Setting, changing, or deleting a passwordSelecting a temporary startup device Selecting a startup deviceViewing or changing the startup device sequence Exiting the Setup Utility program Updating flashing the Bios from a disc Using system programsUpdating system programs Updating flashing the Bios from your operating system Recovering from a Post and Bios update failureUpdating system programs ThinkCentre User Guide Troubleshooting and diagnostic programs Basic troubleshootingDiagnostic programs Lenovo Solution CenterLenovo ThinkVantage Toolbox PC-Doctor for DOSOptical mouse Cleaning the mouseNon-optical mouse Troubleshooting and diagnostic programs ThinkCentre User Guide Getting information, help, and service Information resourcesOnline Books folder Lenovo ThinkVantage ToolsAccess Help Safety and warrantyLenovo Welcome Lenovo Support Web siteUsing the documentation and diagnostic programs Help and serviceCalling for service Using other services Purchasing additional servicesAppendix A. Notices Television output notice Trademarks ThinkCentre User Guide Index CRUInstalling options Memory module PCI card Security features Set Power-On Password ThinkCentre User Guide Page 0A94223