Recently, during a moderately sized run of parts, my Artsign laser started losing power. Eventually it could barely scratch the surface of the acrylic I was working.

I don't get any greater power when using the "Laser Test" button.

So I would guess that the problem is with either the laser tube or with the high voltage power supply.

After reading a bit, I followed MacGyver's suggestion to check the resistance of the tube with the water flowing but the PS disconnected. The resistance was higher than my meter could measure.

So, how do I determine if I have a bad tube or a bad power supply? Can I get a replacement PS without having to wait weeks for one to arrive from China?