I purchased a k40 for $80. I ran it a few times to test it, and the laser was not burning. I held a paper in front of the first mirror and it burned through. The optics were my problem. I killed the machine, pulled the mirrors, spent hours polishing and cleaning the soot and aggregate off of them. I installed the mirrors, and set off to realign them.
Here is where things get funky. I was doing the far and near test with a post it note in front of the second mirror. I held the laser test button for 1 second and it would burn through the paper before I took my finger off. I moved my paper again, and tapped the test button again, and moved my mirror as needed. I get to the last mirror, and I did a double tap on accident and on the second tap of the test button the machine screamed at me.
When I press the button now it continues to scream at me. The question is, since it was working well before i double pressed the test button, could this be a tube error, component error, or something crazier?