Dell OptiPlex 5400 Service Manual page 75

6. Remove the bottom cover.
7. Remove the rear-I/O
8. Remove the speakers.
About this task
The following image indicates the location of the microphones and provides a visual representation of the removal procedure.
Steps
1. Disconnect the microphone cable from the system board, and unroute it from the routing guides on the display-assembly
base.
2. Remove the two screws (M2x2.5) that secure the microphone modules to the middle frame.
3. Lift the microphone modules off the slots on the middle frame.
bracket.
Removing and installing components 75