NEJE E80 weak laser power after fire – stable 24V, normal current draw, new protective lens

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Title: NEJE E80 weak laser power after fire – stable 24V, normal current draw, new protective lens

Hello,

I need help diagnosing a NEJE E80 laser module.

I purchased the NEJE Max 3 / E80 laser from the seller/store, and before the problem it was working very well. The E80 module was able to cut thick pine wood and had strong cutting performance.

During one cutting job, the material caught fire. After this incident, the cooling fans were damaged and I replaced them. The module still powers on, the laser still emits, and the beam can be focused, but the cutting power is now much weaker than before.

I have already checked the following:

  • Power supply voltage:

    • 24.1V idle

    • around 23.7–23.8V under 100% laser load

    • so the power supply does not seem to collapse.

  • GRBL settings:

    • $30=1000

    • $31=0

    • $32=1

  • LightBurn / firmware:

    • the laser temperature is displayed normally.

    • Example message: “Laser temperature: 22.7C”

    • During engraving I have seen around 42C maximum, so the temperature feedback appears to work.

  • Current measurement in series on the 24V input:

    • Laser OFF / idle: 0.62A

    • 10% power: 0.90A

    • 30% power: 1.47A

    • 50% power: 2.12A

    • 75% power: 2.90A

    • 100% power: 3.79A

This means the current increases normally with PWM power, and at 100% the module draws about 3.79A from 24V. Because of this, I am not sure if the main driver board is the problem.

I also replaced the protective lens with a new one. The focus distance is correct, around 24 mm. The nozzle was also removed for testing, so I do not think the beam is hitting the nozzle.

The laser still creates a focused spot/line, but the optical cutting power is much lower than before. For example, even at very slow speed and 100% power it barely cuts compared to how it worked before the fire.

My questions are:

  1. Based on these measurements, is this more likely to be:

    • degraded laser diodes after overheating/fire;

    • damaged or contaminated internal optics;

    • damaged coating on the internal lens/FAC optics;

    • driver board problem;

    • cooling / NTC / fan related problem?

  2. If the E80 still draws normal current at 100% but the optical output is weak, does that usually indicate degraded LDs or internal optical loss?

  3. Is there any safe way to inspect the internal optics of the E80 without losing alignment?

  4. Are the internal LD / optical assembly parts available as spare parts, or only the full E80 module?

  5. Can someone confirm what should be checked first after a fire event where the fans were damaged but the module still works electrically?

I can provide photos/videos of:

  • the module;

  • the protective lens;

  • the test lines;

  • the current measurements;

  • the inside of the module if needed.

Any technical guidance from NEJE support or users who have repaired an E80 module would be greatly appreciated.

Thank you.