My 3D printer (Inventor 3D plus) using RAMPS1.4 with Arduino Mega using Marlin firmware (tweaked by manufacturer).

I do preheat with hot end and heated bed then I jog with extruder motor. After I rotate and press knob the LCD fade out and 3D printer resets itself. Although I'm connected to the PC with USB, still the same.

What possibly goes wrong with this?


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