Dell OptiPlex 9020 (Mid 2013) - Manual (Page 17)

6. Remove the speaker from the chassis.
Installing the Internal Speaker
1. Place the speaker in its slot on the chassis.
2. Rotate until the latch is secured in place.
3. Route the speaker cable beneath the system fan cable and WLAN antennae cable (if installed).
4. Connect the speaker cable to the system board.
5. Install:
a) drive cage
b) front bezel
c) cover
6. Follow the procedures in After Working Inside Your Computer .
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