IBM ThinkPad T21 Hardware Maintenance Manual page 143

Removing and replacing a FRU
Make sure that the system lock key A is set to the Unlock
position. Release the front latches in step 3 , and then
remove the top cover 4 . For step 5 , see the inside
view, shown in the circle.
5
4
3
A
137
ThinkPad T20, T21, T22 and T23 series