Ir 1600 printer board I/O initializing

[Tajso]

Hi,
I have Ir1600 copier, bought Printing board, place it using service maual, but if I switch machine to printer mode, then diplay says I/O initializing. What I can do? some kind of reset, or firmware update?
thanks

[Tajso]

OK I found solution, Unplug and then plug printerboard back easy but still dont know why it doesnt work before...