IBM THINKCENTRE 8123 - Manual (Page 24)

16. On the new system board, release and pivot the locking lever, then pivot the
microprocessor retainer until it is open.
Note: There will be a black protective cover on the retainer to protect the
microprocessor socket. As you close the microprocessor retainer, remove the
cover. Place the black protective cover on the microprocessor retainer of the
defective system board.
17. Position the microprocessor so that the notches on the microprocessor are
aligned with the tabs in the microprocessor socket.
Important
To avoid damaging the microprocessor contacts, do not tilt the
microprocessor when installing it into the socket.
18. Using the vacuum pen 1 , lower the microprocessor straight down into the
microprocessor socket.
16 Hardware Replacement Guide