Issue description

If you encounter a pop-up error message showing "Capacitance value abnormal" in xTool software, please follow this troubleshooting guide to resolve this issue.

Possible Causes

• Capacitive sensor board deformation
• Improper installation: The welding head is not properly installed on the carriage.
• Loose nut: Loose cutting tip nut causes capacitor acquisition circuit unable to conduct normally.
• Contaminated sensing pads and probes: The sensing pads of the capacitive sensor or the probes of the cutting tip are contaminated, resulting in poor contact.
• Cutting tip malfunction: Damaged cables, failed probes, or circuit board failure may prevent proper capacitance detection.

Detailed procedure

Step 1: Check the appearance of the capacitive sensor board

Check if sensing pads on the capacitive sensor board work normally.

• If the sensing pads fail to spring automatically, refer to Replace the Capacitive Sensor Board for xTool MetalFab CNC Cutter to remove the board and check if it is obviously deformed.
• If the sensing pads work normally and show no deformation, yet the issue persists, please proceed to the next step.

Step 2: Check the welding head installation

1. Power off the machine.

2. Ensure that the cutting nozzle is firmly installed in the cutting tip and that the welding head makes flush contact with the carriage with no obvious gaps.

3. Hold and swing the cutting tip to check if the welding head is properly assembled and installed.

• If stable: Try again in XCS to see if the issue persists.
• If loose: Reinstall the cutting tip to the welding head, and the welding head onto the carriage, then check again.

4. If this does not resolve the issue, proceed to the next step.

Step 3: Check the cutting tip nut

Check if your cutting tip nut is fully tightened.

• If not, follow this video to reinstall the nut.
• If yes but the issue persists, proceed to the next step.

Step 4: Clean sensing interfaces and probes

1. Remove the welding head from the carriage.

2. Detach the cutting tip.

3. Clean with alcohol-dipped cotton swabs:

• Sensing pads of the capacitive sensor on the carriage
• Probes on the cutting tip's U-shaped component

4. Reassemble the welding head, put it back in place, and test again.
5. If this does not resolve the issue, proceed to the next step.

Step 5: Check the cutting tip

1. Check the black cable for visible damage. 

2. Press and release the four probes of the cutting tip to see if they can spring back smoothly.

3. If none of these steps resolve the unexpected issue, please prepare the following materials and send them to xTool Customer Service for further assistance:
4. 1. A video recording your troubleshooting process and results
   2. Work log of xTool MetalFab CNC Cutter

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