Dell OptiPlex 3280 Service Manual page 59

Steps
1. Align the screw holes on the speakers with the screw holes on the display-assembly base.
2. Replace the four screws (M3 4+7.1xZN) to secure the speakers to the display-assembly base.
3. Route the speaker cable through the routing guide on display-assembly base and connect the speaker cable to the system
board.
Next steps
1. Install the rear-I/O bracket.
2. Install the bottom cover.
3. Install the system-board
4. Install the back cover
5. Install the cable cover
6. Install the stand.
7. Follow the procedure in
shield.
(optional).
After working inside your computer.
Removing and installing components 59