Lenovo THINKCENTRE 6019 Hardware Maintenance Manual page 138

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Hardware Maintenance Manual
7. Remove the microprocessor from the system board socket by lifting it out of
the socket.
Important
Do not touch the gold contacts on the bottom of the microprocessor.
Touch only the sides.
a. Take notice of the orientation of the notches 1 on the microprocessor.
This is important when reinstalling the microprocessor on the system
board.
b. Do not drop anything on the socket while it is open. Keep all contacts as
clean as possible.
8. Make sure that the lever on the microprocessor retainer is fully open.