IBM ThinkPad R40 2681 Hardware Maintenance Manual page 100

Removing and replacing a FRU
When installing: Place the CPU on the CPU socket ( 1 ),
A
2'
Note: When replacing the CPU, you must replace the
thermal pad FRU 5022BZ4023A also.
96
ThinkPad R40
and then rotate the head of the screw
(A) in the direction of arrow 2 to
secure the CPU.
2
A'
1
1'