I posted this in SS tech but did not realize there was a system 1-80 club. So I apologize for the crosslisting I am hoping some sys80 experts can help.

I have a Volcano that was working fine and then lost its sound. It has a Rottendog MPU, Niwumpf driver board, new power supply, and new Swemmer sound board. It has sound in attract mode, but not during game. It also oddly plays the attract mode sounds during a game every 4 minutes or so - I have attract mode DIP setting set to 4 minute intervals on the sound board. Here is what I have done thus far to trouble shoot the problem.

1) I have repinned all of the connectors including the harness between the MPU and driver board
2) Sound board diagnostic checks out fine - all correct numbers are voiced at the end of the sound board check when grounding the appropriate pins
3) Grounding the pins on the driver board connector at A3j5 results in correct sounds
4) Grounding the pins on z13 on the driver board results in no sound
5) when in diagnostic test, grounding the appropriate pins on z13 results in "FAIL" for each sound
6) Logic probe readings for z13 outputs during attract mode are pin 2- hi, pin 4 - hi, pin 6-hi, pin 8-lo.
7) Logic probe readings for z13 during a game are pin 2- hi, pin 4 - hi, pin 6-hi, pin 8-lo.
8) Logic probe readings for z3 pin 9 for sound 16 in attract mode lo
9) Upstream at z31 in attract mode pin 6- lo, pin 3- lo, pin 11- lo, pin 8 - lo (same readings on these pins in game)
10) Upstream at z27 attract mode pin 2 - hi, pin 4- hi, pin 6- hi, pin 12 - lo (same readings on these pins in game)

Thanks,

Robert

Yes, the Swemmer board has DIP switches. I have them set for background sound and voice. They are fully engaged.