Lenovo ThinkStation C20x 4269 Hardware Manual page 150

10. Go to "Completing the FRU replacement" on page 158.
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Hardware Maintenance Manual
Notes:
a. Note 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.
6. 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.
Important
To avoid damaging the microprocessor contacts, do not tilt the
microprocessor when installing it into the socket.
7. Lower the microprocessor straight down into the microprocessor socket of the
system board.
8. Place the heat sink into position and replace the 4 screws to secure the heat
sink to the system board.
9. Reconnect the heat sink fan cable.