Have 1988 model Fadal 904-1 with 88 control.
Initially had problem with an occasional runnaway. Then machine quit operating. All boards from this machine have been put in a similar machine and the other machine operates fine with all these boards installed. (This included memory expansion, cpu, video, bus interface, x, y and z axis, spindle controller, clock card, mill interface). The amp cards were checked but were not put in the #2 machine.
Screen says amplifier fault. When handwheel is rotated the readout shows movement, but no movement occurs.
Will not cold start, jog in any axis and creeps slowly.