Issue Description

When this issue occurs, the laser head won't go back to the home position properly. You will probably see the laser head jitters or keep going up or down. If the machine is connected with XCS in the meantime, you may see a pop-up notification like below.

#1 Check the Lead Screw in the Laser Head

1. Please remove the protective cover of the laser head, and check whether there is any foreign object on the lead screw.
2. If so, please clean it up and move the laser head up and down to observe whether the laser head can move smoothly.

#2 Check the Z-Axis Limit Sensor

#3 Check the Connection Cable of the Laser Head

Unplug and re-plug the cables as shown and check whether they are loose or broken.

#4 Check the Z-Axis Lead Screw Motor

#5: Check the Connection Cable of the Z-Axis Adapter Board

1. Check the cables in the drag chain for breakage;
2. If you have a multimeter, please follow the steps in the tutorial video of removing the casing of P2, and check the electric connectivity of these cables.
3. Please refer to the article to remove the casing of P2: 
   https://support.xtool.com/article/949

4. If the cable is broken or damaged, please contact the after-sales team for cable parts and follow the link below to have the cable replaced.
   https://support.xtool.com/article/833

If None of the Above Works

If you have followed the instructions above and the issue is still not resolved, please read the article in the link below, collect the troubleshooting steps you have taken, and contact xTool tech support for further advice.