Dell Latitude XT2 (Early 2009) - Manual (Page 81)

Replacing the Mini-Card
1. Slide the mini-card into the WLAN connector slot at an angle.
2. Press the card down to the alignment posts and hold in position.
3. Reseat the retainer clips that hold the card in position.
4. Connect the appropriate antenna cables to the card you are installing:
l If the card has two triangles on the label (white and black), 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). Place the remaining gray cable in the chassis next to holder next
to the card.
l If the card has three triangles on the label (white, black, and gray), connect the white antenna cable to the white triangle, connect the black
antenna cable to the black triangle, and connect the gray antenna cable to the gray triangle.
CAUTION: 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.
CAUTION: To avoid damage to the mini-card, ensure the cables are not under the card when you place the card.
NOTE: The card slot will be marked by a WLAN silk-screen. Do not install the mini-card into any other card slot. If you are installing a WWAN card, install
the card in the slot marked by a WWAN silk-screen.