Sega Audio Amplifier Issue

rikitheshadow

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Trying to debug this issue with this amp from a Crazy Taxi game. The Front and Rear channels both keep passing from low to high volume randomly. Maybe it could be the volume pot, but I'm not sure. I have double checked to make sure it was the AMP for sure and not the Naomi system. Fed an exterior sound input to the amp from like my phone and it did the same thing.

Any ideas?

Caps? Amp chips? Rectifier? Volume Pot?
 
If it were on my bench the first thing I'd do would be to check for cracked solder then check the ESR on the caps and replace any bad ones.

The volume randomly changing is one of the symptoms of bad caps on the Neo Geo boards so that's why I'd check caps... but cracked solder joints are common and easy to find so start there.
 
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