Dell Precision M4400 Service Manual page 68

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 WLAN card, ensure the cables are not under the card when you place the card.
NOTE: The card slot will be marked by a WLAN label. Do not install the WLAN card into any other card slot.
1. Slide the WLAN card into the connector at a 30-degree angle to the system board.
2. Press the card down onto the alignment post and hold in position.
3. Replace the M2x3-mm screw to secure the WLAN card.
4. Connect the appropriate antenna cables to the WLAN card you are installing:
If the WLAN 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 the card.
If the WLAN 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.
NOTE: Ensure the antenna cables are routed through the cable channel.
5. Replace the bottom of the base assembly (see
6. Follow the procedure After Working on Your
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Removing the Bottom of the Base
Computer.
Assembly).