Daytona USA sound problem

SuttumLikaPimp

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I recently purchased Daytona USA Limited Edition(My first arcade game). The price was right but there was no sound when the game was powered up. The previous owner said he thought it was the volume control knob. After checking the machine out a little bit I noticed a fuse that needed to be replaced. Once I powered the system back up I had sound! I was excited but once I walked back around the machine I realized that the sound that was coming from the speakers was just a bunch of random garbage. It has absolutely nothing to do with whats going on screen. So I guess I'm just wondering what might possibly cause this? Where should I start? Remember I am a complete NEWB when it comes to these things so any help is greatly appreciated!
Thanks in advance!
Matt
 
there's a lot of equipment involved in running the sound on these things.

parts to note: main PCB cage (the data for the sound comes from here), the sound board (this processes the sound), and the amplifier (kind of self explanatory I think).

hunt down the sound board first. there should be 2 sets of connectors going to it, they have like white-ish wiring, that comes off the back of the main PCB cage. ensure first that those are connected properly. if this doesn't get it, move on to the next step: there are 2 RCA plugs (stereo sound) on the sound board, these go to the audio amplifier, follow those, make sure those are plugged in good and tight. alternatively, you could try running it with these unplugged, and see if you still get the same garbage sound, I guess for fun.

to be safe, if you got replacements laying around I suppose you could replace the RCA cables too. :)

if all your connections appear to be good and you're still getting garbage sound, I would say your problem is probably in the sound board itself. the ROM chips in it can be susceptible to "chip creep", but I found that a mere pressing down of the roms on these boards can be a bad idea. I don't know which cabinet design you have, but on the sitdowns all kinds of SHIT can build up on the PCBs underneath, and without cleaning the sound board off on one of mine first, I wound up lodging little wood chips in the ROM socket and broke the socket.

grab a toothbrush/paintbrush and make sure all the little shit that may be on the board is cleaned off first. you may have to separate the 2 halves of the sound board to do this if I recall... just make sure they're on a flat surface so you don't bend/break the boards.

(replacements for those sockets aren't overly abundantly available.... unless you're psycho like me and find that in the main PCB cage, on the ROM board, that there's some unused sockets and grab a donor from there. :))

then obviously reconnect everything the way it's supposed to be.

I hope this helps. if it doesn't, then you're gonna have to hunt down a different sound board to try out in there.

another likely scenario is your amp could be bad too, I don't know about Daytona 1, but on Daytona 2 if the speakers are blown they can blow up (like literally put a hole in it) the IC on the amp. run an ohm test across the + and - terminals on your speakers, I forget if they're 4 or 8.

that's all I got.
 
Ok I'll try all of that when I get home tonight! Thanks for the reply and all the advice! Would it be possible to pm you with any further questions? What is a good source for finding a replacement sound board?
Matt
 
Virtua Racing, Virtua Fighter and Virtua Cop all use the same sound board, it should not be hard to dig one up cheap and swap the ROMs. You should hear "hiss" through the speakers and probably some noise when adjusting the volume to tell you that the amp is good. I've had a lot of sound board failures, the amps are usually fine.

The speakers in Daytona are usually good so he shouldn't have a problem there. The speakers Sega started using a couple years later are total crap though and they fail often, I've had games in where all the main speakers are blown (subs are usually ok.)
 
Virtua Racing, Virtua Fighter and Virtua Cop all use the same sound board, it should not be hard to dig one up cheap and swap the ROMs. You should hear "hiss" through the speakers and probably some noise when adjusting the volume to tell you that the amp is good. I've had a lot of sound board failures, the amps are usually fine.

The speakers in Daytona are usually good so he shouldn't have a problem there. The speakers Sega started using a couple years later are total crap though and they fail often, I've had games in where all the main speakers are blown (subs are usually ok.)

^ pretty much all of this, lol

you could PM me, but now I'm no longer working every single day of my life and the games are at work, so I won't be able to get you any info direct from a working machine.

it's not entirely far out that you have a sound board failure, it could be caps, an IC, or maybe bad roms. there's lots of donors out there though.

the guy I usually bought little odds and ends parts from on ebay went by the store name GameboardsOC. you might be able to post a want on here though and find what you need.
 
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