jingles is correct that error code is indicating a Pan Error.
Could be a slipping belt, or in the dj spot 250's it could be the cheap piece of plastic that is used to hit the limit switch on the pan. If you force the head with any force against the pan limit switch you will snap the piece of plastic. The motor will not know when it is in the "home" position and will continue to try to get to it's position. The motor will run, the belt will slip and will cause this vibration you are talking about. Could also be a wire that came loose from the limit switch or the pcb.