Have run into a bit of a snag trying to get audio on my Satan's Hollow project cabinet. I had two shot power regulator boards (one wouldn't output above ~2.3v, one would output around 5, but the adjustment pot was shot and wouldn't adjust accurately), so picked up a switching power supply conversion from Arcadeshop. This got the game up and running - it now plays, just with no audio.
The culprit is the fuse for the AC 12v line that goes to the J6 plug on the power board. A 3 amp 250v slow blow fuse is called for, and that's what I'm using (although just for giggles I tried a 5 amp once). Powering the machine up blows the fuse every time (went through about four) almost instantly. I measured the AC voltage output with a working fuse at a little over 13v (at the wire), so it's a little high, but the AC amps only measured at about 1.86 across the terminals of the fuse holder. I'm a little unclear why these fuses keep blowing here, as the amps seem to be below the rating of the fuses.
Essentially, my questions are these: 1) are there any common problems that would cause this fuse to blow, and 2) is there any other good way to get the voltage required to run the audio system, bypassing the big transformer altogether? I'd really like to get some sound out of this thing.