How long have you had the XT10G, is it still under warranty? If so, contact the dealer and let them sort it out. If not, you will need a new board. What you need to do is put an in-line fuse between your power outlet and the XT10G. Initially use a 1 amp quick blow fuse suitable for 12v. Power the unit and check the fuse. If ok, move one of the axis. Again, if ok, move the other axis. Do the same moving both axis simultaneously and check the fuse. If the fuse blows when you initially switch it on it needs to be returned to the dealer who will send it to the manufacturer for analysis. If the fuse blows on initial axis movement try a 2 amp quick blow fuse. If that blows on any initial axis movement, again it needs sending back to the supplier. If the 2 amp blows on both axis moving simultaneously you could use a 3 amp fuse. If that blows, again, return to supplier. I wouldn't go any higher than a 3 amp fuse.
Steve