The laser marking machine has a red light but cannot perform marking

I. Quick Software Parameter Troubleshooting (Completed in 5 Minutes)

Enter the parameter settings interface of the marking software, check the laser type option to ensure it fully matches your device (select Fiber for fiber laser machines, and CO₂ for CO₂ laser machines).

Check the marking parameters to confirm the power is not set to 0% and the frequency is within the normal range of 20-50kHz, so as to avoid the laser output being locked due to out-of-limit parameters.

Try adjusting the value of the "Marking Start Port" and test each option from 0 to 15, as different brands of devices have different compatible ports.

II. Optical Path & Basic Operation Troubleshooting (Completed in 10 Minutes)

Wipe the focusing lens and beam expander unidirectionally with anhydrous ethanol and lens cleaning paper to remove dust and oil stains on the surface, preventing them from blocking the laser output.

Fine-tune the Z-axis height and move the marking head in a small range near the conventional focal length, to ensure the laser focus accurately falls on the surface of the material to be processed.

Calibrate the red light indicator and adjust the angle to make the red light path completely coincide with the actual laser output path, eliminating the problem of optical path deviation.

III. Hardware Circuit Troubleshooting (Completed in 15 Minutes)

Use a multimeter to detect the output voltage of the laser power supply and confirm the 24V power supply is normal. If the voltage is abnormal, replace it with a matching stable power supply.

Check all connecting wires from the control card to the galvanometer and the laser, and re-plug the loose aviation plugs and signal wires.

Check the operating status of the chiller and cooling fan to confirm the device does not trigger protective shutdown due to overheating.

IV. Final Verification & After-sales Guidance

After completing the above operations, restart the device and the marking software, import a simple test pattern for trial marking to confirm whether it returns to normal.

If the laser still cannot output after all steps, the laser module is most likely aged and damaged, you can contact the equipment manufacturer to apply for after-sales inspection and replacement