Street Fighter Sound Problem

[jeff412]

I have a Street Fighter 2 CE but I can't seem to get the sound to work.  I've tried the obvious.  The speaker wires are connected.  I can hear a low hiss in the speakers, so I know they're getting power.  I've tried adjusting the volume pot.  I can't seem to find a volume adjustment in the game settings.  Is there one?  Does anyone have any suggestions?

Jeff

[sarge]

Have you measured your 12V output from your supply?

[jeff412]

Yes.  It is 12.7 V.

[Kevin Mullins]

Did you try the volume pot on the pcb itself or were you just referring to a cabinet volume pot ?

[jeff412]

The one on the PCB.  I couldn't find one on the cabinet.  Is there another one?

Jeff

[Kevin Mullins]

I don't know what your cabinet may have in it...... most people refer to a volume pot and they are just talking about the cabinet pot and don't realize there is even one on the pcb.

All it takes is a quick look to follow speaker wiring and see if it leads to a cabinet pot or not.
Usually right inside the coin door area or mounted to the cabinet wall somewhere reachable.
(if there is one at all)

[jeff412]

There is a spot for a volume control, but there isn't one.  Does this game have a sound board or is it all in the chips?

Jeff

[Kevin Mullins]

There is a spot for a volume control, but there isn't one. 

Are there wires just hanging there ?

There's no other sound board for that particular game, it's all onboard.

[jeff412]

Nope.  No disconnected wires anywhere.

Jeff

[jeff412]

1.  Does the cabinet volume pot connect in series with the speaker wires or is there a control wire that connects the pot to the board?

2.  Where would it connect? 

3.  Anyone know where I can get the schematics for this game?

Jeff

[jeff412]

After doing a lot of research I found that Capcom CPS-1 machines were originally designed for the Z80A processor(It's even silk screened for it)  and built with the Z80 to save money.  Evidently, this cheaper processor has a higher failure rate.  Even though the sound test showed the processor passed, I changed it anyway.  I now have all sounds working.  Just thought I'd update this post in case anyone else has this problem.

Jeff

[Kevin Mullins]

I never would have even thought about something like that.
(mental note taken)
 

[jeff412]

Here's a link to some really good troubleshooting information on the Capcom CPS-1/CPS-2 machines.

http://newlifegames.net/nlg/index.php?topic=155.0


Jeff
 

[SirPeale]

Noted!