I have a Tarm 2 that's probably 3 years old. I used it a couple times then left it with a friend who probably banged it around a bit, judging by the scratches on it. Got it back the other day and after firing it up I see 2 problems. I'm wondering if I have a good chance of fixing either of them on my own. I'm an electrical engineer with lots of hands on experience, so not unfamiliar with such repairs.
1. The colors don't line up super well in the vertical axis. Projector is 15 ft from the wall in this pic.
I've popped the cover off and it seems like I could simply loosen the screws holding the R G and B dichroic filters down and adjust their angle. I'd probably adjust just one to keep it simple. If I'm visualizing the beam correctly, adjusting the filters left right should adjust the beams up/down after it passes through the galvo mirrors and fix the issue.
The question: is this foolish? Will I never get the beams to line up again if doing this by hand?
2. The vertical spread is very jittery for a while after first powering the laser on. It settles out more or less but does tend to still jump around.
See it in this video: https://imgur.com/jfS6HIU
Note that the camera's frame rate conflicts with the laser scan rate to make it seem like it's drawing the image slowly. That's not real, it's the vertical sizing that's bouncing around quite a bit and that's what I want to fix.
The question: This one is more of a mystery to me. Any idea what could be causing this and what I might do to fix it? Mechanical or electrical? Replace the vertical galvo? Replace a circuit board? Send back to the manufacturer?
Appreciate any insights from other diy folks...