Lenovo 4221, 4220, 4222, 4215, 4219 manual Removing the heat sink and fan assembly

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5.Carefully remove the four screws 1 that secure the heat sink and fan assembly to the system board.

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 19. Removing the heat sink and fan assembly

6.Lift the failing heat sink and fan assembly 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.Do not touch the thermal grease while handling the heat sink and fan assembly.

7.Position the new heat sink and fan assembly on the system board so that the four screws are aligned with the corresponding holes in the system board and the heat sink and fan assembly cable can be easily connected to the microprocessor fan connector on the system board.

8.Alternate tightening each screw a small and equal amount until the heat sink and fan assembly is secured to the system board. Do not over-tighten the screws.

9.Connect the heat sink and fan assembly cable to the microprocessor fan connector on the system board. See “Locating parts on the system board” on page 11.

26User Guide

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Contents ThinkStation User Guide Page ThinkStation User Guide First Edition February Copyright Lenovo Contents Index Important safety information Vi User Guide Features Product overviewSystem management features Security features Specifications DimensionsSoftware overview Software provided by LenovoAdobe Reader Antivirus softwareLocations Locating connectors on the front of your computer Front connector locationsLocating connectors on the rear of your computer Rear connector locationsConnector Description Locating components Component locationsLocating parts on the system board Locating internal drivesDrive bay locations Installing or replacing hardware Installing or replacing hardwareHandling static-sensitive devices Installing external options Removing the computer coverRemoving and reinstalling the front bezel Removing the computer coverInstalling or replacing a PCI card Removing the front bezelOpening the PCI card latch Removing a PCI card Installing or replacing a memory module What to do nextOpening the retaining clips Installing or replacing the optical drive Installing a memory moduleRemoving the optical drive Installing the optical drive Replacing the power supply assembly Removing the screws for the power supply assemblyReplacing the heat sink and fan assembly Removing the heat sink and fan assembly Replacing the primary hard disk drive Removing the primary hard disk driveInstalling the hard disk drive into the bracket Installing the primary hard disk drive Replacing the secondary hard disk driveRemoving the secondary hard disk drive Installing the hard disk drive into the bracket Installing the secondary hard disk drive Replacing the card readerRemoving the card reader Replacing the front fan assembly Removing the front fan assembly Installing the front fan assembly Replacing the rear fan assembly Removing the rear fan assemblyInstalling the rear fan assembly Replacing the keyboardKeyboard connectors Replacing the mouseCompleting the parts replacement Mouse connectorsInstalling security features Reinstalling the computer coverInstalling an integrated cable lock Integrated cable lockErasing lost or forgotten passwords clearing Cmos Password protectionPadlock User Guide Creating and using recovery media Recovery informationCreating recovery media Using recovery media Performing a backup operation Performing backup and recovery operationsPerforming a recovery operation Using the Rescue and Recovery workspace Creating and using rescue media Creating rescue mediaUsing rescue media Creating and using a recovery repair disketteUsing a recovery repair diskette Creating a recovery repair disketteInstalling or reinstalling device drivers Setting a rescue device in the startup sequence Solving recovery problemsViewing and changing settings Using the Setup Utility programStarting the Setup Utility program Using passwordsAdministrator Password Password considerationsPower-On Password Hard Disk PasswordSelecting a startup device Enabling or disabling a deviceSelecting a temporary startup device Exiting from the Setup Utility program Advanced settingsSelecting or changing the startup device sequence Creating RAID volumes Configuring RAIDRAID Level Deleting RAID volumes Updating flashing Bios from a disc Using system programsUpdating system programs Updating flashing Bios from your operating system Recovering from a POST/BIOS update failureUpdating system programs User Guide Troubleshooting and diagnostics Basic troubleshootingLenovo ThinkVantage Toolbox Diagnostic programsLenovo System Toolbox PC-Doctor for Rescue and Recovery PC-Doctor for DOSCleaning the mouse Optical mouseNon-optical mouse User Guide Online Books folder Getting information, help, and serviceInformation resources Lenovo ThinkVantage ToolsHelp and service Safety and WarrantyUsing the documentation and diagnostic programs Calling for service Using other servicesPurchasing additional services Appendix. Notices Television output notice European conformance CE mark TrademarksIndex CRUPage Page User Guide Page Part Number 71Y8009

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