Dell OptiPlex 790 (Early 2011) - Manual (Page 51)

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Internal Antenna
Removing the Internal Antenna
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the cover .
3. Remove the front bezel .
4. Remove the drive cage .
5. Disconnect the cables from the wireless local area network (WLAN) card.
6. Unthread the internal antenna.
7. Release the internal antenna port.
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