Lenovo THINKCENTRE 6019 - Manual (Page 139)

9. Loosen the black cover 2 that protects the gold contacts on the
microprocessor 1 , but do not remove it. Pick up the new microprocessor
then completely remove the black cover. Place the black cover on the old
microprocessor.
10. 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.
Chapter 9. Replacing FRUs - Ultra SFF Desktop computers 133