Hello, I bought a Chinese laser machine from alibaba, and when I tried to test the laser it was not working. I tried to do the engraving using K40 Whisperer, but the laser was moving but not firing. Tbh, I don’t know much about laser machines and I don’t know what to do, I took a few pictures from inside to see if anyone knows what is the issue.
Thank you
Please post pictures showing
-Laser power supply connectors
-Control panel
Do you have water flowing/circulating through the tube and a 3-5 gal bucket of water?
And you REALLY need to read all of this FAQ(K40 laser - buying - installing - upgrading - K40.se ) along with the entire K40 Intro on the top of this page you are on. New to K40: Start Here
Or else you’ll be back trying to read it with your one good remaining eye. 
Does the laser fire when you press the test button?
you might want to clarify which Test button. There’s the one on the front panel(which we are still waiting for a picture of) and there’s the Test button on the Laser Power Supply(LPS). But before any forced firing, we need to be sure he has configured the machine for safe operation(ie water flowing for example).
Yeah I was referring to the front panel before getting to the one on the LPS. But point taken about the rest. Just queuing up some questions.
I use this
This is the only thing I found available in my workshop.
Also, I have laser glasses to protect my eyes
Nothing, there’s just a red dot but no firing.
The Laser Power Supply (LPS) is a black box with a yellow triangular caution sticker on the top. It is in the bay under the control panel cover.
The connectors on that supply are green. A 6 pin and a 4 pin.
I need a picture of the front of the LPS.
What test button did you push? The one on the control panel or the one down on the LPS.
Push the red test button down on the LPS does the laser fire???
It’s not working, is something wrong with tube?
It’s best to answer the questions explicitly.
By it’s not working do you mean you pushed the test button on the LPS and it does not fire?
Yes, I pressed the test button on the LPS and the laser doesn’t fire
Ok here are some questions that will help direct our troubleshooting:
To verify:
Link
Please post a link to the page where you bought this machine
The tube is in perfect condition, here is a picture
This is the link to my machine
Thank you
Sorry to say this but the tube is broken… There should not be water in the outer portion of the tube(large diameter). Either it was fired without water or water running or it was broken in transport.
I couldn’t find any crack on the laser tube tho, what may cause this problem?
Thank you
The tube may have been shocked while in shipment and the damage (crack) may not be easy to see.
