I get motion but laser does not fire. New build

Had my eleksmaker clone nano grbl 1.1f in storage for a while so set it up again on a new computer.
I can move the head now ie i make a circle in lightburn (under grbl 1.1f) , press start and the axis move and make the circle but the laser does not switch on. I had a lower wattage spare laser module that I bought at the time and have tried that and that also does not switch on (might be incompatible I guess).
Not sure if I need to change something in lightburn of if the board might have gone funny in storage.
So it could be the laser, part of the board gone faulty or lightburn issue.
Is there a way to test a 4 wire laser (with a 2 wire dongle box attached) ie just plug it into a 12v supply?
Is there a control code I can send to switch the laser on in lightburn?
Or any other suggestions…


Check your setting for $30 and $32 in the console by typing $$ and pressing enter.

$32 should be 1 (enable laser mode)

$30 should be 1000

The $30 value can be set either in your firmware to match LightBurn, or in the LightBurn device settings (S Max) to match your GRBL setting.

got it somewhat working. I flashed the nano with grbl 1.1e and installed the compatible device in lightburn.
The laser now comes on but it weak so am guessing its in low poer mode.
Power is at 100% in lightburn so not sure what to try next.
Any help appreciated.

just read this after you posted your reply

Thought it might help the power issue but both $30 and $32 were at 1 and 1000.


check that $30 in your settings matches the “s-value max” parameter in the Device Settings in LightBurn.

both were the same.
I’ll start a new topic rather than go off course with this topic.

These are your maximum speed settings, in mm/min, which is very slow. Trying to run at speeds higher than this will automatically ramp the power down to compensate.

500mm/min divided by 60 seconds per minute, gives a maximum speed of 8.33 mm/sec. Any faster than that and the power will drop, unless you increase those numbers.