Spy Hunter no gun sound...

deadlander

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Well moved my spy hunter into the garage and now I don't have any machine gun sounds. All of the other sounds work and background music. Any suggestions on how to fix.. Please forgive my ignorance in advance... I'm a pin guy so new to vids.
Thanks for the advice,
Al
 
I'd start by using MAME to help figure out where in Spy Hunter's complex audio hardware the machine gun sound is generated. A few minutes of playing shows us that it's generated on the SSIO board, by one of the AY-3-8910s (the one MAME calls "ssio.1"). Specifically, channel 0 of the 8910.

Then I'd go to the schematics of the SSIO board, and check out the 8910's and what's down-stream of them (before the channels are mixed together).

You might start by swapping the AY-3-8910s and seeing if that changes your situation or not. If it does, one is bad. If not, the problem is down stream (perhaps in the 4016/4066 switch, or the op-amp).

Or, of course, it could be due to some physical damage on the PCB, or a shorted component, etc. But armed with the schems and knowledge of where the missing sound comes from, you can focus your search.
 
You might also go to the diags screens, specifically the one that lets you test the game sounds and listen carefully -- what else is missing? It seems likely that more is missing than just this one sound and that can be used to help run down the problem.
 
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