Jacek, One of two possibilities. 1.) Either the SETUP chips are damaged, defective or not installed properly. 2.) A jumper is not properly set, though I don't believe the jumpers need to be changed unless additional ROM blocks are installed.(posted 9190 days ago)I HIGHLY recommend that you contact a Kurzweil service center in your area or you can call Kurzweil directly at 253-589-3200.
Mike