Dell Precision M2400 (Mid 2008) - Manual (Page 100)

1. Slide the card into the connector labeled WWAN/FCM.
2. Press the card down and hold it in place.
3. Replace the M2 x 3-mm screw.
4. Connect the white antenna cable to the connector labeled "main" (white triangle), and connect the black antenna cable to the connector labeled
"aux" (black triangle).
5. Replace the bottom of the base assembly (see Replacing the Bottom of the Base Assembly ).
6. Follow the procedures in After Working on Your Computer .
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NOTICE: The connectors are keyed to ensure correct insertion. If you feel resistance, check the connectors on the card and on the system board,
and realign the card.
NOTICE: To avoid damage to the WWAN card, ensure the cables are not under the card when you replace it.
NOTICE: Insert a WWAN card or FCM only into the slot labeled WWAN/FCM.