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● CNC-350 No screen problem

Ans: 

There is possible the 220V single phase power loss 

  1. The controller main 220V power come from the top on Main Power Electromagnetic contactor , please see attached circles then check the 220V power , If no 220V , Just check or replace new component to solve the problem.
  2. Besides 220V power will go to controller back power connector , please also check it with 220V.