IBM ThinkPad R40 Hardware Maintenance Manual page 100

Removing and replacing a FRU
W hen in s ta llin g : Place the CPU on the CPU socket ( Q ),
N ote: When replacing the CPU, you m ust replace the
thermal pad FRU 5022BZ4023A also.
9 6 ThinkPad R40
and then rotate the head of the screw
(A) in the direction of arrow Q
secure the CPU.
to