The step motor of a wire cutter can be locked, but for what reason
It may be caused by motor damage, high pulse frequency, or an unefficient connection between the control line, according to the phenomenon of the motor's ability to lock but not move. There are several reasons for stepper motors: The control line is not connected to the motor actuator (through the multimeter or oscilloscope). There is no reliable electricity in the step drive. There is no reliable connection between the motor line. Determine whether the drive is damaged (by changing the direct judgment). Determine whether the motor is damaged (judging by the replacement). The pulse frequency is too high, the motor is blocked.
The first two answers are possible. If there is a vibration, the control signal has been delivered, the control section can be ruled out, and if there is no reaction, the driver has a problem
Where did you look at the electrical and mechanical card if not see motor deficiency such as lack of phase or not check is there a broken lines and resistance Such as check power amplifier tube isn't broken Step by step to check Slowly will find dao
