Don, I’ll run the test tonight as suggested.
Doug, the color of the laser is always blueish purple and it appears to increase intensity as I turn up the power. It’s not a dramatic visual through the power spectrum but it’s definitely noticeable.
Some more back story information.
This isn’t the first time I’ve had this problem. The first time was about 2 years after buying the machine. Back then everything I read suggested replacing three parts, cheapest to most expensive. The POT, LPS, and finally the laser tube itself. I thought surely the laser tube and LPS couldn’t be the issue because they seemed like the most robust out of the three components. So, I replaced the POT with a recommended model. It worked, for about a month. Then, the same thing started happening. So, I bought a new power supply, recommended unit, and that fixed the problem. Fast forward a couple of years later and today I’m having the same issue. This time I skip the POT and buy a new LPS. After all, everything I read or saw on YouTube said these machines are notorious for having an LPS problem. The trouble with the flyback transformer in particular. Well, after replacing the LPS, again, the problem didn’t go away. So, a new POT was ordered, the same model as the last one and that didn’t fix the problem.
So, I’m wondering if it’s a problem with the laser tube. At least that’s what I keep wondering. Because it’s the only original part that has not been replaced.
I think I might just borrow a multimeter and run those tests. This way I know the readings I get will be accurate.