Stepper motor help...STM5776

[SweetAs]

Hi,

So my laser machine has developed an almighty vibration when moving the y axis back and forth. It runs off of a single motor mounted in the center of the machine, attached to a pulley which then transfers into a shaft through couplings and runs dual belts either side...if that makes sense.

We were running some precise but elaborate work this week at 150mm/s and I think this has damaged the motor, everything else seems to be fine so I am guessing that this is the issue.

The motor has the following on the sticker...

Model : STM5776 CE
4.2A (U) 1.8deg/step
www.autospark-tech.com

A+ A-
B+ B-

I have had a google and can only find a couple of pages that don't have any specs that I can figure out. Have any of you seen or used one of these? Any ideas on what I can use to replace it? It is running off of a DM556 if that helps any

Ive tried contacting the supplier but they are next to useless and I need to get the machine back up and running. I also tried the website....I have NO idea what is going on on there lol, there are pictures of scantily clad women and different chats about shipping companies to mobile suppliers and the marketization of Chinese enterprises