The mechanical driving part of the moving head light uses a stepper motor. This mechanical system includes a signal part, a drive, and a motor. The dmx512 signal is decoded by the main board microcontroller or a special control chip and drives the switch tube such as the driving chip or tip to generate pulses. Drive the stepper motor to rotate to realize the shutter (can switch lights, strobe), color wheel, pattern wheel, prism, etc. and the rotation and positioning of the xy axis. As the name implies, the stepper motor can be rotated step by step, generally 1.8 Degrees, that is, 200 steps in one turn, common color wheel patterns and other motors are generally less than 0.5a, xy is generally greater than 1a, because the load is relatively large, the control board receives signals and will provide different frequencies for the drive circuit The pulse realizes the adjustable control of distance and speed to realize different functions. When the machine is turned on, the single-chip microcomputer will control each motor to perform self-checking to realize the zeroing action. Only with the mechanical zero position can the parts have a running reference. The color position inaccurate pattern is not correct. The xy operation is not in place. Generally, it is a zero limit error. Generally, the moving head lamp is mechanically limited. That is, a positioning pin will hinder the movement of the moving head lamp to achieve zero. The damage rate of the stepper motor is relatively low. If there is weakness or it is determined that the drive is ok, the limit is normal and the operation is abnormal, then the stepper motor failure can be considered.