Lenovo 7099U1U, Hardware Maintenance Manual

Page: 119 / 224

Figure 53. Installing the heat sink fan duct
12. To complete the replacement, go to “Completing the parts replacement” on page 132.
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.
2. Remove the computer cover. See “Removing the computer cover” on page 101.
3. Remove the heat sink and fan assembly. See “Replacing the heat sink and fan assembly” on page 110.
4. Place the heat sink and fan assembly on its side so that the thermal grease on the bottom of it does not
get in contact with anything.
Chapter 9
.
Replacing FRUs (Machine Types: 0889, 5023, and 7844.)
113