Dell OptiPlex 755 User Manual page 47

6. Before you close the card retention mechanism, ensure that:
The tops of all cards and filler brackets are flush with the alignment bar.
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The notch in the top of the card or filler bracket fits around the alignment guide.
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7. Secure the card(s) by closing the card retention latch and snapping it into place.
NOTICE: Do not route card cables over the cards. Cables routed over the cards can prevent the computer cover from closing properly or cause damage
to the equipment.
1 release tab 2 adapter retention latch
4 serial port adapter 5 serial port adapter system board
connector connector (SERIAL2)
8. Connect the adapter cable to the PS/2 serial port adapter connector (SERIAL2) on the system board (see
NOTE: See the documentation for the PS/2 serial port adapter for information about the cable connections.
9. 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 PS/2 serial-port
adapter bracket
Replacing the Computer Cover).
Begin.
Removing the Computer Cover).
System Board Components).