Lenovo 7812, Hardware Maintenance Manual

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Notes:
a.
Notice the orientation of the notches
1
on the microprocessor. This is
important when reinstalling the microprocessor on the new system board.
b. Do not drop anything onto the microprocessor socket while it is exposed.
The socket pins must be kept as clean as possible.
15.
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
cover and place it on the microprocessor socket of the failing system
board when you complete this procedure.
16. Holding the microprocessor with your fingers, position the microprocessor so
that the notches on the microprocessor are aligned with the tabs in the
microprocessor socket on the new system board.
Important
To avoid damaging the microprocessor contacts, do not tilt the
microprocessor when installing it into the socket.
17.
Lower the microprocessor straight down into the system board socket of the
new system board.
18. To secure the microprocessor in the socket, close the microprocessor retainer
and lock it into position with the small handle.
19. Install the retention module for the heat sink and fan assembly on the system
board.
20. Install the heat sink and fan assembly on the new system board.
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Hardware Maintenance Manual