Common Reasons Why A CO₂ Laser Tube Fails To Emit Light

A CO₂ laser tube is a critical component in laser cutting and engraving machines. When the laser tube fails to emit light, it can disrupt production and reduce efficiency. This article outlines the most common causes of this issue and provides practical troubleshooting methods to help you identify and resolve problems quickly.

1. Common Reasons Why a Laser Tube Doesn’t Emit Light

1.1 Laser Power Supply Failure

The power supply provides the necessary voltage to the laser tube. If the power supply is damaged, aging, or has a loose connection, the tube will not operate properly.

1.2 Cooling System Malfunction

A CO₂ laser tube requires efficient water cooling. If the pump fails, the water flow is insufficient, or the pipeline is blocked, overheating may occur, preventing the tube from working or causing permanent damage.

1.3 Control Signal or Motherboard Issues

When the control board fails to send a proper signal, the laser tube may not be triggered. This may result from a damaged motherboard, loose wiring, or incorrect settings.

1.4 Laser Tube Damage

Physical damage such as broken glass, gas leakage, burned electrodes, or internal contamination can lead to total failure or weak laser output.

1.5 Electrical Cable Problems

Worn-out or loose high-voltage cables and signal wires can interrupt the power or control signals needed for the tube to function.

2. Quick Troubleshooting Tips

✅ Check the Power Supply

Use a multimeter to verify if the power supply is functioning. Inspect indicator lights or replace the power unit to test.

✅ Inspect Water Cooling System

Ensure the water pump is working, the water level is sufficient, and the tubing is clear. Remove any air bubbles or sediment.

✅ Test Signal Wires and Control Board

Confirm all connectors between the power supply and the control board are secure. Try replacing the control cable.

✅ Examine the Laser Tube

Look for signs of damage, fogging, or overheating. Gas leakage usually results in white clouding inside the tube.

✅ Use Manual Test Button

Try manually firing the laser from the power supply. If it works, the issue likely lies in the control board or software.

3. Puri Laser’s Recommendations and Support

At Puri Laser, we suggest users:

• Change cooling water every 6 months

• Always use a compatible laser power supply

• Install water pumps with overheat protection

• Regularly clean laser optics and tubing

With each Puri Laser CO₂ tube, we provide technical guidance and after-sales service to ensure optimal performance and rapid problem resolution.

Conclusion

While a CO₂ laser tube that stops emitting light may seem like a major issue, it can usually be resolved with careful step-by-step inspection. Preventative maintenance and using high-quality components are key to reducing failure rates. Choose Puri Laser tubes for longer service life, stable output, and professional technical support.