Xerox DC250 replace finisher with simple catch tray

Hello printers!

I have old Xerox DC250 with long delivery - finisher that is connected to the printer by cable.
So it looks like this:


I want to remove it and use Simple Catch tray.


But problem is that:
When I disconnect finisher cable, machine shows error and stops...
Is there anything that needs to be conected when Simple Catch tray is installed? Or short some pins in connector?

Thanks for help!