IBM ThinkPad T20 Hardware Maintenance Manual page 118

When installing: Make sure that all of the guides are
114
ThinkPad T20, T21, T22, T23 (MT 2647/2648)
firmly attached 1 and you have
fastened the connector firmly to the
underside of the system board 2 .
1
Removing and replacing a FRU
2
1
1