Dell Precision 3440 Small Form Factor Service Manual page 32

Steps
1. Connect the antenna cables to the WLAN card.
The following table provides the antenna-cable color scheme for the WLAN card of your computer.
Table 2. Antenna-cable color scheme
Connectors on the wireless card
Main (white triangle)
Auxiliary (black triangle)
2. Place the WLAN card bracket to secure the antenna cables.
3. Align the notch on the WLAN card with the tab on the WLAN-card slot and insert it into the connector on the system board.
4. Replace the (M2x3) screw to secure the WLAN card bracket and WLAN card to the system board.
Next steps
1. Install the 2.5 in. hard drive
2. Install the front bezel.
3. Install the side cover.
4. Follow the procedure in
32 Disassembly and reassembly
assembly.
after working inside your computer.
Antenna-cable color
White
Black