Dell OptiPlex 755 User Manual page 108

NOTE: See the documentation for the PS/2 serial port adapter for information about the cable connections.
8. Replace the computer cover (see
Removing a PS/2 Serial Port Adapter
1. Follow the procedures in Before You
2. Remove the computer cover (see
3. Gently push the release tab on the card retention latch from the inside to pivot the latch open. The latch will remain in the open position.
1 card retention latch
4. Disconnect the PS/2 serial adapter cable from the system board (see
5. If necessary, disconnect any external cables connected to the adapter.
6. Ease the PS/2 serial-port adapter bracket out of its retention slot.
7. If you are removing the adapter permanently, install a filler bracket in the empty card-slot opening.
NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain FCC certification of the computer. The brackets also keep
dust and dirt out of your computer and maintains the airflow that cools your computer.
Replacing the Computer Cover).
Begin.
Removing the Computer Cover).
2 alignment guide
System Board Components).