Mesa 7i76e Power off no Stepper movment

If U19 is damaged, it most likely either a step/dir output got shorted to a
voltage outside the 0 to 5V range, or there is a severe EMI situation where
plasma voltages are coupled to the Step/Dir signals.

This coupling can come from plasma/step/dir wiring coupling or poor (high impedance)
table grounding.

Thanks for your answer.
I checked the table grounding and connected every metal part to ground also the computer. I checked the wiring of my steppers aswell. Before I will fire the plasma again I have hoppfuly the last questions about this topic. I use jmc servo motors with the driver hooked on the motor. So the stepper drivers are not in a meatle case shall I also try to ground the housing of the stepper? Or make a metal case around the stepper before I fire the torche again? The shielding are only concected to ground in my electrik kabinet right?

Thanks a lot for your help!