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I powered it up with 110vac and burned a few holes. Thanks guys, it looks like I'm good to go here. With no power control pot used its supposed to run at 40% power. It seems to have a lot of power even at 40%.

I tried to contact the seller but all they do is send me a manual which says nothing about input voltage. Since someone wrote on it 110 and neither of the ac terminals are connected to the case I'm guessing 110 is my best bet even though I requested 220V. I added a picture to the original post...

I Just purchased a 40 Watt CO2 laser and power supply from China. I requested a 220V Power supply but when it arrived it had grease pen on the side 110 VAC. The terminals are labeled FG for Frame ground and AC and AC. I would presume the 110 VAC writing would be correct but how can I tell for...