i have THREE machine from mazak which is Mazak QT-200,Mazak VTC-160A,Mazak FJV-250 that suffered same problems, PCB malfunction.
The problem is the when pcb located at the back of the mazatrol controller is not working,may be same with the normal pc with motherboard problem.

does anyone knows which part of the pcb that usually faulty? i have difficulties to trace.