Lenovo 7090, 9705, 9625, 9421, 9353, 9485, 9623, 7061, 3656 Replacing the heat sink and fan assembly

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assemblies are voltage specific, and some power supply assemblies have a voltage-selection switch. If your computer has a voltage-selection switch, ensure that you set the voltage-selection switch of the new power supply assembly to match the voltage available at your electrical outlet. If necessary, use a ballpoint pen to slide the voltage-selection switch to a different position.

vIf the voltage supply range in your local country or region is 100–127 V AC, set the voltage-selection switch to 115 V.

vIf the voltage supply range in your local country or region is 200–240 V AC, set the voltage-selection switch to 230 V.

7.Install the new power supply assembly into the chassis so that the screw holes in the power supply assembly align with those in the chassis.

8.Install the four screws to secure the power supply assembly. Note: Use only screws provided by Lenovo.

9.Reconnect the power supply assembly connectors to the system board.

10.Reconnect a power supply assembly connector to each of the drives.

11.Go to “Completing the parts replacement” on page 45.

What to do next:

vTo work with another option, go to the appropriate section.

vTo complete the installation, go to “Completing the parts replacement” on page 45.

Replacing the heat sink and fan assembly

Attention

Do not open your computer or attempt any repair before reading and understanding the “Important safety information” in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy of the ThinkCentre Safety and Warranty Guide, go to: http://www.lenovo.com/support

This section provides instructions on how to replace the heat sink and fan assembly.

CAUTION:

The heat sink and fan assembly might be very hot. Turn off the computer and wait three to five minutes to let the computer cool before removing the computer cover.

To replace the heat sink and fan assembly:

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.Remove the computer cover. See “Removing the computer cover” on page 16.

3.Lay the computer on its side.

4.Locate the heat sink and fan assembly. See “Locating parts on the system board” on page 12.

Chapter 2. Installing or replacing hardware 25

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Contents ThinkCentre User Guide Page ThinkCentre User Guide Second Edition December Copyright Lenovo 2008 Contents Index Important safety information Vi User Guide Product overview FeaturesConnectivity Security features Environment SpecificationsSoftware provided with your Windows operating system Software overviewLenovo ThinkVantage Toolbox Antivirus software Locations Locating connectors on the front of your computerRear connector locations Locating connectors on the rear of your computerConnector Description Component locations Locating componentsLocating internal drives Locating parts on the system boardShows the locations of the drive bays User Guide Installing or replacing hardware Installing or replacing hardwareInstalling external options Handling static-sensitive devicesRemoving the computer cover Removing the computer cover Installing or replacing a PCI card Removing and reinstalling the front bezelOpening the PCI card latch What to do next Opening the retaining clips Installing or replacing a memory moduleRemoving the memory module Replacing the batteryInstall a new battery Removing the retaining screws for the power supply assembly Replacing the power supply assemblyReplacing the heat sink and fan assembly Removing the heat sink and fan assembly Replacing the primary hard disk drive Replacing the heat sink and fan assemblyRemoving the primary hard disk drive Installing the primary hard disk drive into the bracket Replacing the secondary hard disk drive Installing the primary hard disk drive and bracketRemoving the secondary hard disk drive Installing the secondary hard disk drive into the bracket Replacing the optical drive Installing the secondary hard disk drive and drive cageRemoving the optical drive Replacing the diskette drive or card reader Removing the diskette drive or card reader Removing the front fan assembly Replacing the front fan assemblyInstalling the front fan assembly Replacing the rear fan assemblyRemoving the rear fan assembly Installing the rear fan assembly Replacing the front audio and USB assemblyRemoving the front audio and USB assembly Removing the old internal speaker Replacing the internal speakerReplacing the keyboard Installing a new internal speakerKeyboard connectors Replacing the mouse Completing the parts replacementReinstalling the computer cover Installing security featuresIntegrated cable lock Integrated cable lockPassword protection Erasing lost or forgotten passwords clearing CmosPadlock Installing or replacing hardware User Guide Recovery information Creating and using recovery mediaCreating recovery media Using recovery media Performing backup and recovery operations Performing a backup operationPerforming a recovery operation Using the Rescue and Recovery workspace Creating rescue media Creating and using rescue mediaCreating and using a recovery repair diskette Using rescue mediaCreating a recovery repair diskette Using a recovery repair disketteInstalling or reinstalling device drivers Solving recovery problems Setting a rescue device in the startup sequenceStarting the Setup Utility program Using the Setup UtilityViewing and changing settings Using passwordsUser Password Password considerationsAdministrator Password Setting, changing, and deleting a passwordSelecting a temporary startup device Selecting a startup deviceSelecting or changing the startup device sequence Exiting from the Setup Utility programUsing system programs Updating flashing the Bios from a diskette or discUpdating system programs Recovering from a POST/BIOS update failure Updating flashing the Bios from your operating systemUpdating system programs User Guide Basic troubleshooting Troubleshooting and diagnosticsLenovo ThinkVantage Toolbox Diagnostic programsLenovo System Toolbox PC-Doctor for Rescue and RecoveryCleaning the mouse PC-Doctor for DOSOptical mouse Non-optical mouse User Guide Information resources Getting information, help, and serviceOnline Books folder Lenovo ThinkVantage ToolsSafety and Warranty Access HelpThinkVantage Productivity Center Lenovo WelcomeHelp and service Using the documentation and diagnostic programsCalling for service Purchasing additional services Using other servicesAppendix. Notices Trademarks Television output noticeCRU IndexPower Page User Guide Page Part Number 89Y0418
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9421, 9953, 9705, 9935, 9795 specifications

Lenovo has established itself as a significant player in the global technology market, particularly with its innovative line of laptops. The models 9353, 3656, 9625, 7061, and 9946 showcase the company's commitment to combining performance, portability, and cutting-edge technology.

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Overall, these Lenovo models cater to different needs and preferences, all while emphasizing performance, portability, and cutting-edge technology, solidifying Lenovo's reputation in the laptop arena.
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