Need help with a SFII Sound issue

Waterborn

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I have a Street Fighter II Champion Edition board. The video and controls work fine, but I am having some issues with the sound. When I turn the game on, the speaker pops and I get about 2 seconds of music. Then just a loud hum and no sound. Any idea what I should do to trouble shoot this. Anyone know which ROMs control sound on this board. The board also has the Hyper Fighter add-on board. Any help would be greatly appreciated. I am trying to get this game fully functional by this weekend as we are planning to give it away in conjunction with an event we are hosting at PAXEast on Saturday.

Update: Just took the two boards apart and found a quarter wedged in between them. Not sure if this could have caused the problem (can a quarter create a short?), but when I put the boards back together and tested them, I had sound!

Dane
 
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I don't think this will be a rom issue. from the sounds of it (really, no pun intended :)) it could potentially be a cap problem in the sound section.

there was a CPS1 thread much like this about a month or so ago with the same problem I think. I think the game was a Final Fight, if you wanna try running a search.

physically inspect the board for no noticeable blown or damaged components near the amplifier chip attached to a heatsink... that's your sound section. make sure no caps have broken legs or anything like that.

outside of that, I've never had a CPS1 game before, only CPS2. another last ditch effort, is the board very dirty? I think another problem the CPS1 has is with the A/B/C board connections not making good contact, you could try taking those apart and reseating the connections.

I'm leaning towards it being a bad cap or two though, unless I'm missing something.
 
yeah, uh... that's bad. lol

goes to show that whenever you acquire used goods, best bet is to check over misc. things like that, particularly power wiring and the like. I know at auctions and such you don't get this luxury, they just plug the shit in and you take the gamble.

I found a couple Blitz cabs at an auction last year where the monitor on one was horribly out of focus and totally adjusted out of whack, and another wouldn't even power up, and I took a huge gamble that they were serviceable.

I adjusted the first one out fine, and the 2nd one was unplugged. the contrast was dialed through the roof, and the tube had a short in the red gun and the green was very dull.

you don't want to know what horrors I found lurking on the floor or how the hard drive in one was held in by 1 screw. :)

in essence, it pays to go over your equipment. especially getting the vacuum cleaner with the hose out.

glad you resolved this btw. stupid, easy fixes are always great!
 
Funny how its a SF2 and you found something shorting it...I had one I had gotten, brought it home and it had a piece of foam rubber stuck to the bottom. DIdn't think anything of it, fired it up, and smelled smoke. Shut it down and peeled the foam rubber off, sure enough an aluminum candy wrapper. Grrr.
 
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