Dell Latitude E4300 (Late 2008) - Manual (Page 78)

7. Slide the WLAN card out at a 30-degree angle from its connector.
Replacing a WLAN Card
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 it in position.
3. Replace the M2 x 3-mm screw to secure the WLAN card.
4. Reconnect the appropriate antenna cables to the WLAN card:
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). Store 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.
5. Replace the WLAN/WWAN cover.
6. Follow the instructions in After Working on Your Computer .
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1 WLAN card 2 M2 x 3-mm screw
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 is marked by a WLAN label. Do not install the WLAN card into any other card slot.
NOTE: This procedure assumes that you have completed the removal procedure first.
NOTE: Ensure that the antenna cables are routed through the cable channel.