Just so I get it right and do not screw something up even more, can you tell me exactly which terminals to attach my voltmeter to? Also you mention the voltage should be labeled on the case. On the PS case? It is a 40V PS. Is that what you mean?
Thanks
Got a box somewhere else, like near the tube?
None of these are what weâre looking for.
Go to the tube and follow the hot end (anode) back to itâs source.
The anode is the opposite end of where the beam comes out.
The motor driver for the Z axes is comparably large⌠
Wow. 3 power supplies in just that one photo and none of them being the HVLPS.
YES. I found it on the other side of the laser. Did not even know it was over there.
I agree. Crazy big.
Brand is ZYE
MYJG100W-X-1
Hey guys I just want to let you know that I am being blocked/limited on my posts because I am new. So I can no longer reply to any posts until tomorrow. So frustrating!
I would appreciate your continued assistance on this. I will continue to monitor and read these and respond as soon as my limit is lifted.
Thanks for all the guidance! Much appreciated!
Whatâs the specific model for the LPS? Not all holes lead to pots in those which is what prompted my original question.
That is why I thought the large one was the correct PS because all the pics I see from others, the laser PS is usually the large one in the group. Weird.
Iâve updated your level so that you should be able to post again.
The manual I found for this is extremely sparse. I see no mention of a potentiometer to adjust current, however.
ZYE MYJG-100W Laser Power Supply Instruction Manual (device.report)
This does not surprise me 
And the image of the PS on the manual does not show an adjustment hole on the top like mine. I wonder what the â-X-1â on the end of my part number means?
Oh, youâre right. Take a close look into the hole. Do you actually see a potentiometer in there? If it is then itâs likely for power adjustment. However, it may also just be a peep hole for an LED or something else entirely.
Nope. I do not see anything in the hole. It actually looks like the side of the fan is just inside the hole. But there is another hole on the side that I found. I cannot see inside as it is in a tight location.
Beginning to think I may need to just make adjustments in the Vendor Settings and call it a day.
Pots are typically on the side like youâre showing for the last one. Still a shot?
The end of the supply with the screw terminals has three sets of terminals labeled COM and +V. Set the multimeter to DC volts, put the black multimeter lead on COM, the red lead on +V, and the voltage should read around whatever the supply is supposed to produce.
Theyâre typically labeled in the most inconvenient place possible, but something along these lines:
Those are from my 3D printer, but theyâre typical of the breed.
A 40 V supply would be unusually high, because the spec for the 6442 controller is 36 V. Itâs possible the OEM installed a âtoo highâ 40 V supply, then adjusted it downward to 36 V using the trimpot, but thatâs Bad Practice⢠(although typical, AFAICT), because adjusting the pot upward, as you just did, can kill the hardware.
There is no telling which way to turn the pot to adjust the voltage upward or downward, so itâs a crapshoot.
Hmm. So I guess I would have to unscrew it to to be able to see what is in the hole.
Thanks so much for the info. I am not surprised that they may have installed a wrong size PS. I know that the pot was pretty much all the way counterclockwise so I will see if that is closer to 36v or 40v and go from there.
So with the pot all the counterclockwise it was very close to 36v so I adjusted it as close as I could and ended up at 36.02v. Is that good or do I need to get it dead on?
I unmounted the PS so I could look in the hole on the side and there is a tiny brass pot just inside the hole. Although there is no documentation for a potentiometer, should I try to adjust it?
What I would do is not necessarily what you should do⌠personally, Iâd go for it. Make a mark so you know exactly where to put it back to if required.
Thatâs as close to dead on as youâre ever going to see, particularly as typical multimeter accuracy isnât nearly that good. Ship it!
That will be the adjustment on a ten- or twenty-turn trimpot similar to the one over on the right of this (failed) ZYE supply:
Count the turns as you adjust it, so you can unwind it back to where you started if things come to that.
