Hi Guys

My Vinyl Cutter Roland PNC-5000 has recently all of a sudden just stopped moving.
The Stepper motor on the belt (cutting head) makes a buzzing noise whether there's a load on it or not which means the carriage doesn't move at all now. I'm hoping it's not a problem from the circuit board side.
does anyone know what might be the issue please? I've attached a video too.

Many Thanks