Lenovo ThinkCentre 8111 Hardware Replacement Manual page 20

15. Lower the microprocessor retainer 1 and then lower the lever 3 to secure
16. Place the heat sink 2 into position and lower the lever 1 to secure the heat
17. To install the new system board into the chassis, tilt the front end of the
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Hardware Replacement Guide
the retainer. Make sure the lever is securely locked into position.
Note: There will be a black plastic cover on the microprocessor retainer to
protect the socket on the new system board. When you lock the
microprocessor in position, remove the black plastic cover. Place the
black plastic cover on the microprocessor retainer of the failing system
board.
sink.
system board between the diskette drive and the fan assembly, and position it
so that the slots in the new system board are aligned with the pins on the
chassis.