Lenovo ThinkStation Hardware Maintenance Manual page 121

6. Remove the heat sink from the failing system board. See "Replacing the heat
sink" on page 109.
7. Note the location of all cable connections on the system board and disconnect
all cables. See "Locating parts on the system board" on page 98.
8. Remove the nine screws that secure the system board to the chassis, following
the sequence shown in the figure:
9. Carefully lift the system board out of the chassis.
10. Remove the microprocessor socket cover from the new system board.
11. Remove the microprocessor from the failing system board and install it on the
new system board. See "Replacing the microprocessor" on page 111.
12. 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.
To install the microprocessor socket cover:
a. Release the lever securing the microprocessor retainer and open the
retainer to access the microprocessor.
b. Grasp the microprocessor on the sides and lift it straight up and out of the
socket. Do not touch the contacts on the microprocessor socket.
c. Align the notches 1 of the microprocessor socket cover with the
alignment keys 2 of the microprocessor socket. Lower the socket cover
straight down into the microprocessor socket on the system board.
Chapter 10. Replacing FRUs - Menorca Computers
115