Dell Vostro 3300 (Early 2010) - Manual (Page 71)

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Wireless Wide Area Network (WWAN) Card
Dell™ Vostro™ 3300 Service Manual
Removing the WWAN Card
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the battery .
3. Remove the base cover .
4. Remove the keyboard .
5. Disconnect the antenna cables from the WWAN card.
6. Remove the screw that secures the WWAN card to the system board.
WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best
practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance.