We have recently acquired an old Daewoo Puma 4-3A with Fanuc OT. Was running fine till today when we attempted to replace worn keypad membrane sheet. The new membrane wasn't fitting well so we had to add selfadhesive spacers between membrane and pushbuttons. While checking of functioning of all keys (by consequential keying all one by one) the NC went on cycling (like some of buttons got jammed) that could not be reset from key pad and we switched the machine off. New powerup resulted in some error codes of velosity unit problems, that partially recovered by resetting of thermal relay. Remained errors are:
The S0 LED on mother board is ON. NC does not accept any parameter change. Machine Ready pushbutton does not work (24V however goes to MRD line when depressed). The error list recommends to measure current of OM servo motor but motor cannot be run and is hold by brake. There is no 90VDC supply to release brake (its relay does not get 24VDC from NC). All voltages and fuses are OK. What it could be?