Dell Latitude E5420 (Early 2011) - Manual (Page 37)

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Wireless Wide Area Network (WWAN) Card
Removing the Wireless Wide Area Network (WWAN) Card
1. Follow the procedures in Before Working On Your Computer .
2. Remove the battery .
3. Remove the back panel .
4. Disconnect the antenna cables from the WWAN card.
5. Remove the screw that secures the WWAN card to the system board.
6. Remove the WWAN card.
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