That’s ok, the AXIS U: +5V should not drop.
L-On1 dropping is good.
L-AN1 and GND drop to about 0.22 when running, no matter where I put the potentiometer.
L-AN1 and GND should be reading more when the job is running…what power % value are you using in your test job?
Test job could be a circle with several passes - or low speed and power set to 50% and use ‘Line’ mode.
I changed my job to a circle, 6 passes, Speed 50%, power 20%. Changing the value at the Pot has no effect on the V between GND and L-AN1, I tried changing it before and during the job.
The settings look ok - at least nothing too crazy stands out.
Set the power to 50%.
You should get a reading between L-AN1 and GND - if not try reading between LPWM1 and GND.
Set it to 50% at the Pot or in the cut settings?
I tried reading at LPWM1 to GND, (there is no wire attached to LPWM1) and this reads zero on cut.
Cut settings, the pot should always be at 100% for these tests.
Hmm if LPWM1 is reading nothing when the job is running that’s not good.
Is the indicator LED #9 for water protection still lit?
Yes it Is …
As a test, if you move the red wire that is currently plugged into L-AN1 and plug it into the U-AXIS +5V along with the blue wire (with the pot dialed down to start with) and start a job (but during the job dial up the power using the pot) does the laser fire?
YES!! IT FIRES!! 
Does the pot affect the power level?
It’s not really a fix, because it’s bypassing the controller signal for power level.
You might need to try enabling Laser2 at the controller and using all the signals at CN6 instead of CN5, to do this you also need to enable ‘Laser 2’ in LightBurn and use the Laser 2 controls:
But this is a bit of a nuisance though - if the controller is new then all the outputs of CN5 should work, can you get it replaced?
I’ll try this but I am doubtful, this is actually the second mother board. They sent me one, and we had this same problem, they blamed the board and sent me a replacement, this is actually the second one.
Didnt work. The resting V at L-AN2 to GND is 1.2V, goes to 1.6V when running.
Ok, well at least it’s working better than CN5 - if you leave the multimeter connected does the resting voltage continue to slowly drop? Are you testing against GND on CN6?
If you increase or decrease the cut settings power does the 1.6V value change?
It does not slowly drop on resting.
I increased cut power to 80% and that did not change the 1.6V value.
I have the WP jumpered, both laser tube and WP are ON for laser 1 and 2.
But I only have 1 laser tube. Should I shut 1 off? Only one laser shows up in my lightburn.
I dont know, this feels like something within lightburn to me.
