12. Lift the heat sink and fan assembly off the failing system board. Place the heat
sink on its side so that the thermal grease does not come in contact with
anything.
Note: Youmight have to gently twist the heat sink to free it from the
microprocessor.
13. Remove the microprocessor from the failing system board. See “Replacing the
microprocessor” on page 99.
14. Remove the microprocessor socket cover from the new system board.
15. The failing system board must be returned with a microprocessor socket cover
to protect the pins during shipping and handling. Install the microprocessor
socket cover removed from the new system board on the failing system board.
Toinstall the microprocessor socket cover:
a. Make sure the microprocessor has been removed fromthe microprocessor
socket, and then close the microprocessor retainer and lock it into position
with the small handle.
b. Insert the tabs 1 of the socket cover into the hinged side of the socket,
and then press the other side of the socket cover downward until the tabs
2 snap into position.
16. Install the new system board into the chassis and align the screw holes with
those in the chassis. Insert and tighten the screws that secure the system
board.
17. On the new system board, release the lever securing the microprocessor
retainer and then pivot the retainer until it is fully open.
Note: There will be a black plastic cover on the microprocessor retainer to
protect the socket on the new system board. Remove the black plastic
Chapter8. Replacing FRUs- Rocky computers 97