Dell OptiPlex 9020 (Mid 2013) - Manual (Page 20)

Installing the I/O Panel
1. Align the I/O panel with the I/O-panel bracket and tighten the screws to secure the I/O panel.
2. Insert the I/O panel into the slot on the chassis front.
3. Tighten the screws to secure the I/O panel to the computer.
4. Connect the audio cable and USB cable to the I/O panel.
5. Install:
a) drive cage
b) front bezel
c) cover.
6. Follow the procedures in After Working Inside Your Computer .
Removing the Power Supply Unit
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove:
a) cover
b) front bezel
c) drive cage
d) intrusion switch
3. Disconnect the power cables and remove the screw that secures the power supply to the system board.
4. Remove the screw that secures the power supply to the chassis.
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