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.

Troubleshooting

Follow the video below to inspect whether the lead screw of laser module works properly.

Video

Situation 1:

 Situation 1 is caused by foreign objects on the lead screw or the guide rail. At this time, you should:

• Clean foreign objects and lubricate the lead screw with lubricating oil (as shown below).

• Turn the threaded shaft up manually or power on the device to see whether it can lift automatically.

If the problem persists, it is likely that the z-axis motor is broken and needs to be replaced. See the tutorial:

Situation 2:

The z-axis makes a "clack clack" sound when lifting to the top of the z-axis, and the indicator is off.

1. Observe whether the indicator is on (as shown below).

If so, it means the limit switch works properly. If not, it means the limit switch isn't triggered.

Solution:

(1) Unplug and re-plug the cables as shown and check whether they are loose or broken. Then connect a power supply to the device.

(2) If re-plugging does not work, check whether the blocking plate bends or is covered by foreign objects (as shown below).

Check whether the limit switch sensor is stuck by foreign objects (as shown below). Clean the residues in a timely manner.

(3) If the indicator is still not working. You need to test it manually. Follow the steps:

1. Power on P2 and connect it to the computer with a USB cable.
2. Open your browser and select the link that corresponds to your operating system.

• For Windows: http://201.234.3.1:8080/cnc/cmd?cmd=M110S1&force=1
• For Mac: http://201.234.4.1:8080/cnc/cmd?cmd=M110S1&force=1

3. Input the link in the address bar and hit enter to unlock the Y-axis and Z-axis motors.
4. Move the laser head up and down manually and observe whether the indicator of the Z-axis homing signal changes.
5. If the indicator does not change, it means the Z-axis adapter board is faulty. Please replace the Z-axis adapter board.

Situation 3:

The z-axis makes a "clack clack" sound when lifting to the top of the z-axis, and the indicator is on. However, a "clack clack" sound remains.

It means both the limit switch and the z-axis motor work properly. The z-axis adapter board is likely faulty. Replace the z-axis adapter board. See the tutorial:

Situation 4:

If the threaded shaft can be turned manually, but it cannot turn and make no sound after the device is powered on, follow the steps:

1. Reboot P2 and connect it to the computer with a USB cable.
2. Open your browser and input and hit enter on the following links in the address bar in succession:

• Lower the laser head:
• • For Windows: http://201.234.3.1:8080/cnc/cmd?cmd=G90Z25F2000&force=1
  • For Mac: http://201.234.4.1:8080/cnc/cmd?cmd=G90Z25F2000&force=1
• Lift the laser head:
• • For Windows: http://201.234.3.1:8080/cnc/cmd?cmd=G90Z0F2000&force=1
  • For Mac: http://201.234.4.1:8080/cnc/cmd?cmd=G90Z0F2000&force=1

3. If the laser head fails to lift properly or is stuck, the motor or motor connection cable may be faulty, please replace it.
4. Refer to the article to replace the part: https://support.xtool.com/article/951

If None of the Above Works

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 https://support.xtool.com/article/844, collect the troubleshooting steps you have taken, and contact xTool tech support for further advice.