I have a SXCNC with the jp-3163B stepper motor driver. The y-axis output is making a "grinding" noise. I checked the cables and the stepper motors and they are working properly. I can take the x-axis cable and connect to the y-axis output and the problem follows the output. In other words, the x-axis makes the grinding noise. I hook the y-axis cable to the x-axis output, and the y-axis runs fine. I bought two of these routers. So I hooked up to the other controller and everything works fine. Could there be a voltage issue on the board for the y-axis output? Or another issue? All the settings on both machines are identical, dip switches and the software settings. Any help or troubleshooting tips would be greatly appreciated.