1. Neither stepping motor turns. Consider the power circuit. Control signal input circuit, because the motor circuit problem can be basically eliminated. 2. The power problem is also relatively simple. Cut off the power supply V+ and V- of a group of drivers. General power aging. 3. The wiring problem is much more complicated. But it is also very intuitive, there is no occasional failure beforeby Abenr - Stepper Motors, Servo Motors, DC Motors