Figure 14. Removing the old battery

5. Install a new battery.

Figure 15. Installing a new battery

6.Reconnect all the cables to the system board and close the computer cover. See “Completing the parts replacement” on page 25.

Note: When the computer is turned on for the first time after battery replacement, an error message might be displayed. This is normal after replacing the battery.

7.Turn on the computer and all attached devices.

8.Use the Setup Utility program to set the date, time, and any passwords. See Chapter 4 “Using the Setup Utility program” on page 35.

Replacing the heat sink

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.

CAUTION:

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

To replace the heat sink, do the following:

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 12.

3.Locate the heat sink. See “Locating components” on page 8.

4.Remove the four screws that secure the heat sink to the system board.

18ThinkCentre User Guide

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Lenovo 3142, 3034, 6667, 5092, 5226, 4394, 3853, 3692, 3557, 3467, 3356, 3307, 3257 Replacing the heat sink, Removing the old battery

3244, 3131, 3257, 3142, 3307 specifications

Lenovo has always been a frontrunner in the computing industry, and their latest line of devices, including models 5226, 3557, 3131, 3257, and 3244, showcases their commitment to innovation, performance, and user-centric design. Each model is tailored to meet varying needs ranging from business professionals to casual users seeking reliable computing solutions.

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