Lenovo 7812, Hardware Maintenance Manual

Page: 145 / 224

Replacing the microprocessor
This procedure describes how to remove and replace the microprocessor. The
procedure varies depending upon the machine type.
Types 7816, 7817, 9686 and 9687
Important
The heat sink and microprocessor might be very hot. Make sure these
components are cool enough to safely handle before continuing this
procedure.
1. Remove the cover. See “Removing the cover” on page 123.
2. Place the computer on its right side to help make the microprocessor more
accessible.
3. Disconnect the heat sink and fan assembly cable from the system board. See
the system board illustration for your machine type at “Locating parts on the
system board” on page 125.
4.
Rotate handle
1
to release the heat sink clamp and then disengage the
clamp from the plastic retention bracket.
5.
Lift the heat sink and fan assembly off the system board. Place the heat sink
on its side so that the thermal grease does not come in contact with anything.
Chapter 9. Replacing FRUs - Tower Computers
139