For A20M/P, A21M/P Series - IBM ThinkPad A20m Hardware Maintenance Manual

For A20m/p, A21m/p series

Note: The illustration shows the combo card. Connector
(A) is for the LAN feature and (B) is for the modem
feature. This slot also supports a Mini PCI modem
card or Mini PCI network card. Step 5 depends
on the card type. Disconnect either (A), (B) or both.
When installing the card, do the following:
v With the notched end of the card toward the socket,
insert the card into the socket, then press it firmly. Pivot
the card until it snaps into place. Make sure that the
card is firmly fixed in the slot and does not move easily.
v Make sure that the connector (A) is placed under the
card when reinstalling the Mini PCI adapter.
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ThinkPad A20m/p, A21m/p, A22m/p
Removing and replacing a FRU