Remove I/O Panel
Disconnect RS-232C Cables from Main Board.
Remove the screws on I/O panel.
Screws
Screws will be reused. Keep them.
2.2 Installation of CB
Remove RS-232C Cables from I/O Panel.
Install original RS-232C Cables on the New I/O Panel (COM3 & COM4).
RS-232C Cable
I/O Panel
183
COM3
COM4