Benbox Laser Machines/CO2 Lasers/3D Printers

General Category => Trouble Shooting => Topic started by: Coco_Grizzly on December 05, 2017, 09:16:14 AM

Title: Oops I did it again (What's a MOSFET, anyway?)
Post by: Coco_Grizzly on December 05, 2017, 09:16:14 AM
Here's a new challenge to test your laser knowledge expertise!

Some info on my setup and what I'm using

The laser itself is 2.5W, non-pwm. Had it for just under three months now. I've included pictures of every nook and cranny I thought could be useful to know.
I use the latest version of T2 laser, running the 1.1e non-pwm firmware, and I've installed the CH340 driver.

here's a link to the amazon page I purchased it from - http://a.co/cyU3BCh (http://a.co/cyU3BCh)

It's been a great little machine, up until a few days ago. I sent a job to the machine, but part-way through the job the laser simply stopped, while the motors kept going. Now, anytime I attempt a new job, it goes through the motions, but the laser never lasts more than 10 seconds before it turns off.

I've attempted quite a lot of troubleshooting to get to the bottom of what's going on, and I've discovered something curious. If I take the plug connecting the laser to the board, and switch it into the port meant to send power to the fan, the laser stays on! I've tested this upwards of five minutes, with no visible falter in the power of the laser.

So my question to you all - where do I go from here? What can I do to get this machine back on its feet?

Edit: Today's lesson - Don't forget to dust out your machine!
Title: Re: What's failed - my board or my laser?
Post by: ggallant571 on December 05, 2017, 09:44:03 AM
I'm guessing that the squarish green board contains the laser driver circuitry. With a scope you could probe to verify the Arduino D11 is pulsing and see that the output is following. Lacking the diagnostic tools, you could try replacing the Nano.

Is there a "weak" laser button on the controller?
Title: Re: What's failed - my board or my laser?
Post by: Coco_Grizzly on December 05, 2017, 10:15:16 AM
I'm guessing that the squarish green board contains the laser driver circuitry. With a scope you could probe to verify the Arduino D11 is pulsing and see that the output is following. Lacking the diagnostic tools, you could try replacing the Nano.

Is there a "weak" laser button on the controller?


My friend, you sent me down the proper path to success.

It does indeed have a weak-laser button. I pressed it, and not a thing happened. I was then struck with the idea to get a can of compressed air out and just dust the whole board down and wouldn't you know it, everything works again.

I would have never suspected dust to be the culprit in something like this, but it goes to show that there's always more to be learned when toying with new (to me) technologies and machines!
Title: Re: What's failed - my board or my laser?
Post by: Zax on December 05, 2017, 10:19:47 AM
I see a buck converter but not the MOSFET that sends power to your laser... it has to be there somewhere. Anyway I think that's most likely the issue although they usually fail permanently open or shorted.

It may be overheating and shutting down, the air duster would cool it (a lot most likely) just like a can of freeze spray is often used to find solder connection issues or component failures.
Title: Re: What's failed - my board or my laser? (FIXED)
Post by: Coco_Grizzly on December 14, 2017, 01:38:42 PM
The issue has arisen yet again. I found the MOSFET, and it's hidden underneath the nano.

How does one check to see if it's shot? And if it is, is there any real way of repairing it?

I have an EleksMaker® ManaSE board that I bought out of frustration, not realizing that the wires coming out of my laser don't quite fit with the plugs on the board. Is there a way I could get the ManaSE to work with my laser?