Dell Latitude 3420 Service Manual page 40

Steps
1. Connect the two antenna cables to the connectors on the WWAN card.
NOTE: The antenna cable connectors are fragile and utmost care should be taken while replacing them.
Table 3. Antenna cable guide
Cable color
White cable (Main)
Black cable (Aux)
2. Align the notch on the WWAN card with the tab on the WWAN card slot.
3. Slide the WWAN card at an angle into the WWAN card slot.
4. Align and place the WWAN card bracket on the WWAN card.
5. Install the screw (M2x3) to secure the WWAN card bracket on the WWAN card to the system board.
6. Close the mylar sheet to cover the WWAN card.
Next steps
1. Install the base cover.
2. Exit the service mode
3. Install the SIM card tray
40 Removing and installing components
for 4G LTE enabled systems.
Connector
White triangle (△) on the WWAN module of the system
board
Solid triangle (▲) on the WWAN module of the system
board