1. First, check if the Z-axis is stuck.

2. Power off the engraver.

3. Manually turn the threaded rod of the Z-axis to see whether it can be moved smoothly.

• If NO. Lubricate the threaded rod. If this doesn’t work, check the Z-axis motor, threaded rod, and laser head bracket for any signs of bending or deformation.

• If YES. Remove the glass cover on the left side of the engraver and then remove the metal plate above the mainboard.

Check whether the LED5 of the mainboard is on.

Under normal circumstances, LED5 will light up after the Z-axis has been reset to its origin, then go out, then light up again, and finally go out.

• If LED5 stays on all the time, fix the Z-axis limit (as shown) by gently tapping it or replacing it.

• If LED5 does not light up, swap the X and Z motor control plugs on the main board.

If the laser head is moving along the X-axis but not along the Z-axis, the mainboard is faulty. Replace it with a new identical one.

If the laser head remains inactive along the Z-axis,

1. Remove the bottom plate.
2. Swap the X motor plug with the Z motor plug on the motor drive board (as shown).
3. Power off the engraver.
4. Manually move the laser head to the lowest point along the Z-axis by turning the Z-axis screw.
5. Turn on the engraver again and check the movement of the laser head along the X-axis and Z-axis.
6. If the laser head is moving along the Z-axis but not the X-axis, replace the motor drive board with a new, identical one.
7. If the laser head still does not move along the Z-axis, check the motor plug beside the Z-axis motor or replace a new motor.