When shaking the head lamp, it sounds like something is stuck. What should I do?

Take apart the shell by ourselves to see if the lamp is deformed. If it is deformed, we will see if the lamp is straightened. If it is not deformed,

Check the circuit and motor from the main board to the XY axis motor,

It's hard for us to turn the normal motor by hand after the lamp is powered on, but it's easy for us to turn the bad motor by hand.

If there is no problem with the motor and circuit, just check whether the reading disk and optocoupler are broken,

After the reading disk and optocoupler are replaced, if the problem is not solved, replace the motherboard.