NBA Jam plays wrong sound samples

shess

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I've got two sets of NBA Jam (main+sound) and they are both having similar problems. When I go into the sound test mode, they will usually play the sound sample but then some other random samples will also get played. Like if the "shoes" sample is played, sometimes it will also interject "Edwards!" into it ... repeatedly. Both sets have this issue. I've swapped the ribbon cables between them and I made sure they were plugged in correctly. I also swapped the sound roms between the two sound boards so I know they're plugged in correctly. I also verified that the power is about 5.1V at the Jamma connector. What's the next step? Clean all the ROM legs? Send all the boards through the dishwasher to get any dust/grime off?

Scott
 
Sounds like a logic fault on the sample rom address bus to me, give the ROMs a reseat but beyond that it would require specialist tools to fix.
 
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