Hey.
Any idea why my laser is now a mess after changing power supply!
There’s a tracing line every time the pointer moves or if I do a frame. It’s not picking up engraving. I’ve sorted the cut lines via ramp test. 
Was this an lps or a 24V power supply?
My machine 100w used 36v
Sorry, I was trying to get out of you what you changed… the lps or the low power supply (36V)…
Neither should be a problem.
Haven’t seen an OMTech with a 36V supply… new to me…
Hi (apologies for the delayed response) it’s the low power supply that I changed. I must have got the wrong thing
Got a picture of the old power supply with the label?
it looks like the High voltage Laser power supply isn’t shutting off when it’s supposed to. The trigger could be backwards or a missing chassis ground could be causing a misfire.
Hey John that is the old power supply the low voltage one. I replaced it with another with the same specification.
I also replaced the high voltage power supply but it made no difference.
I had suggestions it may be the control board but I’m unable to find the same control board online and not sure which of the cloud ray boards are suitable for my machine. I’d hate to spend any more money until I’m certain what the fault is.
Can you use a voltmeter?
You can probably diagnose the issue with only that.
There are only two control signals to the standard lps. If you check them it should give you some idea of what’s happening.
I don’t recommend you change out parts randomly…
The controller is occasionally mounted away from the Screen. Most of the Ruida controllers have a sticker with the model Number on the edge. Some model numbers are easily seen. On mine it was on the bottom edge 4" from the floor of the cabinet. A mirror or a selfie phone camera can help locate the obscured model number if it’s on the edge of the controller.
The control board will also show us if it is wired for Low-trigger or High trigger, then we can confirm it’s the same at the LPS.
Troubleshooting this particular signal if it’s backwards can be disorienting. When backwards, Off is on full blast - and not really evident that it’s on full blast when traversing, 50% power is 50% power. and 100% power is off. I’m hoping that’s all there is to this - lets confirm the one wire before we throw more parts at it. 
I think @JohnJohn has it right… maybe I can make it more clear… This is my Ruida, which is a 6445.
There are two control lines from the Ruida to the lps.
Ruida – LPS
LPWM1 – IN
L-On1 — L (can be wired to H)
If the L-On1 (laser enable) is wired to L then this is the proper setup in the machine settings for laser 1.
If it’s H, then you want to set it to ‘high’…
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