Dell Vostro 2520 (Mid 2012) - Manual (Page 22)

4. Remove the screw that secures the USB board.
5. Lift up the USB board and remove it from the computer.
Installing the USB Board
1. Insert and align the USB board into its compartment on the computer.
2. Install the screw that secures the USB board in place.
3. Connect the USB board cable to the system board.
4. Install:
a) palmrest
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