Dell OptiPlex 990 (Early 2011) - Manual (Page 46)

Installing The Wireless Module
1. Slide the wireless local access network (WLAN) card into its slot.
2. Press the WLAN card downward until it is locked in place by the securing
levers.
3. Connect the antennae according to the color code on the WLAN card.
4. Install the
drive cage .
5. Install the front bezel .
6. Install the cover .
7. Follow the procedures in After Working Inside Your Computer .
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