The main controller (CATS module) does not see the required response from the operation panel.
John rushed back to his desk and started searching for the firmware update. He found it on Ricoh's website and applied it to the printer. The machine whirred and beeped as it updated its software. sc673-10 ricoh error
When all else fails, and you have confirmed the cable and panel work on another machine, the controller board (BICU / Controller PCB) is likely at fault. The main controller (CATS module) does not see