IBM ThinkPad A22e Hardware Maintenance Manual page 118

Removing and replacing a FRU
When installing, do the followings;
v Make sure that the eject lever is popped out a and
then install the sub card.
v Take care not to damage the switch on the sub card (A).
v Make sure that the guide of the card is firmly attached
b as shown in the figure.
A
b
a
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ThinkPad A21e, A22e, i 1800 (MT 2655/2663/2664)