I snatched up another red/black Chinese laser. Previous owner state low hours, he didn’t know how to fix the simple little things. I addressed those and did some test cuts. The laser seamed to cut same at 25+ power. This worried me, I added a current meter and it’s way over power I believe. 40% spikes the 30AMmeter. I cannot find the pot to adjust on the power supply. Someone point it out to me please or if there is another issue? Thank you
I found a few others with the same model number that didn’t either. Wonder if it just doesn’t have one.
@Aaron.F Thank you. I seen these, I was just looking for a single Pot. Next question, does anyone know the procedure on the 4 adjustments? I am going to count the rotations of current positons to have a base line.
It’s here on mine. I wouldn’t think you’d need to get inside the case, it’s supposed to be adjusted while running and it would be bad practice to have you inside and area that produces HV.
This is taken from the back small access panel looking towards the top of the machine. Being a contortionists would be of great value on mine. It’s on the right side of my lps, which points down.
This is how it’s mounted and the above was taken from the far right of the photo.
I assume you mean 30mA…
You can read the run times off the controller via Edit → Get controller information
@jkwilborn I searched the web and forum high and low before my post and found your information you shared with me on another post. I double checked everything from your location. Those four Pots in my initial post are the adjustment settings. I think there is a range of frequency or window of adjustment with each pot. I tried counting turns to stop but they spin infinitely. After a while I gave up on fine tuning counting turns, I turned each one about 25 revolutions. I was able to get the mA down to 9-10mA @ 50% but lost all my low range beam below 29%. I threw in the towel on this power supply because I am not confident to throw in a new laser tube in fear of damaging. At 90% it would fluctuate from 19-22mA. New 60w tube and 80w power supply will be here Saturday. I ordered a spare tube when I picked up the machine, I had future plans to upgrade it to a 80mm/80w machine. I went ahead and ordered a Cloudray 80w power supply as I am told I can dial back the LPS to 20mA. Is this correct?
Laser shows 227hrs of laser on time.
Thank you for your knowledge.
Does this look like an arc ? Check the insulation here. Hard to tell in the photo but it looks like damage to the HV wire
Working with electronics my whole life I see these as 20 turn pots. If you hit the end it may be imperceptible or the pots wiper may actually continue on, resulting with it starting over again. I’ve never take one of the 20 turn pots apart to see how they mechanically work internally, but have used them many times. I have seen some manufactures diagrams on how they work, but each manufacturer may have their own idea of what to do when it comes to the end limits. We see this with some regular pots that the wiper just goes around the resistance strip.
I wouldn’t think they’d make an adjustment for a user that’s internal with no way to get to it while operating. Of course, being Chinese, they may not care if the hv could lite you up as they have no liability with this equipment anyway. Even on mine I use ceramic screwdrivers, I’ve been bit too many times and that could easily cause my internal defibrillator to apply therapy (i.e. shock the 
out of me).
There are basically no schematics of these, I have access to one that’s for a K40, and I follow what it’s doing, but I don’t think that one had a pot to limit current. Many of the K40’s use a pot to set maximum current on the IN terminal of the lps, then use the pwm to enable the laser, which means they are toggling the tube on/off, with on being the manually set current limit. So it on at 100% then off.
If you’re pulsing this from the Ruida console in continuous mode, it should not vary, so I’d think you have a problem with the lps.
Do you have the ability to lower the 80mm tube mounts by 15mm from the 50mm mount? If not you’ll have to raise the other mirrors and the head, which may be a problem. On my machine, I don’t think I can lower the tube 15mm, I run out of room. This is a Russ Sadler tube/mirror holder.
I have no idea how far you can reduce an 80W supply. Mine is a 60W lps driving a 45W tube and I can reduce it to 20mA. I guess you’ll have to trust Cloudray 
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@soniclab I can confirm the red wire that was in question is NOT burnt/arc’ed. I thought wow how did I miss this because it sure does look like it in the photo.
@jkwilborn I’m a journeyman electrician and for 10 years used to work on, rebuild CNC and Robots in the silicon industry. I can relate to getting zapped more times than I would like to admit. I could not feel any resistance in the potentiometers at any point. I thought they may just be on a 0 - 10 dial with no hard stop, that is not the case.
Fingers cross this tube makes it by Saturday and we will see if the 80w Cloudray can dial down from 24mA to 18mA.
I believe my current tube is damaged from the faulty LPS. If my tube does not show up in time, there is no chance in damaging my new LPS from the old tube correct? There is no back feeding from the tube.
New power supply definitely helps out, still not what I would consider at 50ish watt capacity. The new 60w OMTech branded tube will be here this week.
I adjusted the LPS down at 50% power to be right at 9mA on the Cloudray controller. At 50% it’s only 1mA difference between the analog gauge and digital. This photo is at 90% power. Which one do you believe? I’m just averaging the two as of now.
On another note, for anyone deciding between analog or digital…. go analog. You can actually see the fluctuations. The digital gauge does not display fast enough to catch the short bursts but it does work fine for constant power.
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