Diagnosis: Power supply voltage is dropping below 18V due to insufficient amperage. Fix: Upgrade to a power supply rated for at least 2x the total current of all drivers. (e.g., Two JK drivers at 4A each = 8A total → Use 16A supply).
Installing the Goldcut JK Series Driver is straightforward if you follow the color-coded terminal blocks. However, mis-wiring is the #1 cause of driver failure. goldcut jk series driver
Diagnosis: One of the motor coil pairs is disconnected. Fix: Check continuity on A+/A- and B+/B-. If one coil is open, the rotor will just dither. Diagnosis: Power supply voltage is dropping below 18V