Lenovo 7812, Hardware Maintenance Manual

Page: 103 / 224

Replacing the system board
This procedure describes how to remove and replace a memory module. 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. Remove any adapter cards installed in the PCI connectors.
4. You might have to remove the drive bay assembly to access the system board.
See “Accessing system board components and drives” on page 90.
5. Take note of the location of all cable connections on the system board and
disconnect all cables. See the system board illustration for your machine type
at “Locating parts on the system board” on page 87.
6.
Remove the hard disk drive. See “Replacing the hard disk drive” on page 112.
7. Remove the screws that secure the system board to the chassis.
8. Lift the system board out of the chassis.
9. Remove the memory modules from the failing system board and install them
in the same location on the new system board.
10. 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.
11.
Rotate handle
1
to release the heat sink clamp and then disengage the clamp
from the plastic retention bracket.
Chapter 8. Replacing FRUs - Desktop computers
97