Lenovo 7812, Hardware Maintenance Manual

Page: 110 / 224

Replacing the microprocessor
This procedure describes how to remove and replace the power supply. The
procedure varies depending upon the machine type.
Types 7812, 7813, 9680 and 9681
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 85.
2. Lift the fan duct off the heat sink fan.
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 87.
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.
Note:
You might have to gently twist the heat sink to free it from the
microprocessor.
6. To remove the microprocessor
2
from the system board, lift the small handle
1
.
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Hardware Maintenance Manual