I have an unusual problem with a JPT MOPA 60W fiber laser. Up to now it has been working without issues, apart from some initial overheating problems. Recently, however, something strange has started happening. At random moments the laser stops engraving. The red preview dot remains at the exact …

Right after purchase, the laser source used to shut down after longer operation at high power due to overheating. I added additional fans and the problem disappeared. Today I’m going to open the enclosure and see what’s going on inside :slightly_smiling_face: I suspect the laser is heavily clogge…

[image] PawelSekula: Do you think dust could cause this kind of problem? Is that a trick question? The soot/dust on the cooling fins act as an insulator. I just cleaned my 40w/20w laser module last week and was stunned it had not overheated, at least I did not know if it did.

My question was completely serious :slight_smile: Can dust cause this problem with the laser stopping during operation? [image] MikeyH: [image] PawelSekula: Do you think dust could cause this kind of problem? Is that a trick question? The soot/dust on the cooling fins act as an insulato…

[image] PawelSekula: Do Sorry, American humor. Yes, it can definitely impact the cooling. That is why I mentioned what I discovered on my own machine.

I hope it turns out that I’m the stupid one and not that the laser has a defect :slight_smile: I’ll let you know after cleaning :slight_smile:

Not stupid. First laser always comes with a huge learhing curve. You have a Fiber laser, and I have not seen your setup, so I am not sure where it can get gummed up. But I do know if it generates smoke, that smoke will go where you do not want it.

So, I opened the enclosure and cleaned the laser. There was much less dust than I expected, especially considering that I do a lot of deep engraving. The laser works more stably now, but it can still stop occasionally. However, I think I’ve noticed a pattern. The laser stops when working at a freq…

See this post, I think it’s normal behaviour… your machine will stop working to protect itself if both the frequency and power is too high: [image] Laser stops working after continuous operation – overheating? Community Laser Talk I searched the forum for…

I’m not saying that this isn’t the case. However, the laser worked without any issues for an entire year, performing exactly the same tasks. Until now, there were no such problems.

Problem update: The laser still stops randomly, regardless of the frequency :frowning: Does anyone have any ideas?

Unusual laser/galvo problem?

LightBurn Hardware Compatibility Galvo

ednisley (Ed Nisley) January 21, 2026, 2:35pm 19

No matter what the specs say, that much cable requires a signal booster to avoid intermittent problems:

I’ve used these on other projects with good results:

The TetherBoost Pro looks like it would work, although probably with an adapter on the laser end.