11.Lower and position the heat sink fan duct on the top of the heat sink and fan assembly until the four screw holes in the heat sink fan duct are aligned with those in the heat sink and fan assembly. Install the four screws to secure the heat sink fan duct.

Figure 20. Installing the heat sink fan duct

What to do next:

To work with another piece of hardware, go to the appropriate section.

To complete the replacement, go to “Completing the parts replacement” on page 43.

Replacing the microprocessor

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 microprocessor.

CAUTION:

The heat sink and microprocessor 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 microprocessor, 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.

26ThinkCentre User Guide

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Lenovo 7539, 7548, 104, 154 manual Replacing the microprocessor, Installing the heat sink fan duct

7539, 154, 7548, 104 specifications

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