I'm going to vote for a blown driver board, if you can turn the screw with the power on, then there isn't any juice going to the motor. The machine usually doesn't get mad until you move the axis and it doesn't get any feedback. If you can switch the X and Z board, that should tell you pretty quick. On some machines you just need to move over the outputs, if they will reach. Also I would check all the breakers and fuses before investing any money in new parts. One to watch out for though I doubt it is common is on an old bandit controller, once in a while my Y axis would run away, then it was fine, turns out that where the filament was spot welded to the end of the fuse had broken, so at times it would be in the right position and work and some vibrations would throw it off and the Y would go for a random walk. |