IBM ThinkPad A20m Hardware Maintenance Manual page 115

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
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ThinkPad A20m/p, A21m/p and A22m/p