Lenovo H405 Hardware Maintenance Manual page 53

Important
Do not touch the gold contacts on the bottom of the
microprocessor. When handling the microprocessor, touch only the
sides.
4. Lift the microprocessor straight up and out of the socket.
Note
a. You should make note of the orientation of the notches
the microprocessor. This is important for when reinstalling the
microprocessor on the new system board.
b. Do not drop anything onto the microprocessor socket while it is
exposed. as the socket pins must be kept as clean as possible.
5. Make sure that the microprocessor retainer is fully open.
Chapter 9. Replacing hardware
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