Dell OptiPlex 7020 (Mid 2014) - Manual (Page 25)

Removing the Input/Output (I/O) Panel
1. Follow the procedures in Before Working Inside Your Computer.
2. Remove:
a. cover
b. front bezel
3. Disconnect the I/O panel, data, and USB data cables from the system board.
4. Unthread and release the I/O Panel, data cable and USB data cable from the clip on the computer.
5. Remove the screw that secures the I/O panel to the computer.
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