Hello greeting from Greece

I don't know if there is already a thread about my problem.
I have an 644XG Chinnese laser 80w 50x70cm
Recently I bought a rotary. I connected properly (i believe) but the problem is when is trying to synchronize is vibrate like crazy.
When I push the arrows (up+down) there is the same problem. Sometimes is rolling but is stuck again.
Any idea please?

Here is a video I posted


Thanks in advantage

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