The audio chip is at position U15 on the board (top right) i have changed a couple of these with similar problems to yours , have a look around that area as the caps do tend to leak badly there
these are the op amp chips I bought , they are slightly longer in the pin legs but fit fine
The op chip is working correctly. Thanks for your kind offer There has been a leakage of some sort near the audio chip. The keys are also sticky so I suppose someome has spilled some Pepsi on it. Does anyone happen to have a Paula chip, maybe it's faulty?
Since you got distortion on both channels, I'd check that Vref1/2 is ~2.5V as it should be. One of my 600s had the same problem and it turned out Vref1/2 was 0V since a ceramic cap had shorted out.
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