Breakerdown Appearances:
MAZAK CNC Lathe output disorder pointillization, digital enter point status bounce, sometimes is 1 and sometimes is 0.
Troubleshooting:
After PCB Repair, a storage PCB of Mitsubishi CNC system has faulty, there are lots of 74 series chips like 74LS640/244/32/00, additional, one array of RAM chips. Use on-line testing instrument verify all 74 series chips are no problem, but one of RAMs being found has faulty, change this RAM and re-load the parameter, machine can work properly.