Dell Latitude E6420 (Early 2011) - Manual (Page 43)

Installing the Wireless Wide Area Network (WWAN) Card
1. Insert the WWAN card into its connector at a 45–degree angle.
2. Replace and tighten the screw that secures the WWAN card to the
computer.
3. Connect the antenna cables to their respective connectors marked on the
WWAN card.
4. Install the Base Cover .
5. Install the Secure Digital (SD) Card .
6. Install the Battery .
7. Install the ATG Port Cover (only for E6420 ATG systems).
8. Install the ATG Handle (only for E6420 ATG systems).
9. Follow the procedures in After Working Inside Your Computer .
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