Replacing The Microprocessor - Lenovo 7099B8U Hardware Maintenance Manual

9. Place 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. Make sure that you properly place the new heat
sink and fan assembly so that you can easily connect the new heat sink and fan assembly cable to the
microprocessor fan connector on the system board.
10. Alternate tightening each screw a small and equal amount until the new heat sink and fan assembly
is secured to the system board. Do not over-tighten the screws.
11. Connect the new heat sink and fan assembly cable to the microprocessor fan connector on the system
board. See "Locating parts on the system board" on page 69.
12. Reconnect any cables that have been removed.
13. To complete the replacement, go to "Completing the parts replacement" on page 94.

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 71.
3. Lay the computer on its side for easier access to the system board.
4. Note the part and connector locations on the system board. See "Locating parts on the system board"
on page 69. Then, remove any parts and disconnect any cables that might prevent your access to the
heat sink and fan assembly.
5. Remove the heat sink and fan assembly. See "Replacing the heat sink and fan assembly" on page 81.
6. 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.
7. Lift the small handle 3 and open the retainer
Chapter 8
1 to access the microprocessor
.
Replacing FRUs (Machine Types: 0864, 7099, and 7846.)
2 .
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