I found a Graco STX paint sprayer on Craigslist for $50, it looked new, was clean and worked great so I bought it! I thought I SCORED big time but I was oh so wrong. Got it home and after about 5 minutes of spraying the fuse on the circuit board blows! No big deal right, I replaced the fuse and 5 minutes later it blows again! I checked for shorts and anything that looked like it may be an issue but found nothing and no matter how many fuses I replace it still blows them! Like I said I've checked the obvious and I'm not taking it to a Graco service center because I'll spend as much there as I would buying a new one so what else can I check that could possibly be blowing fuses?