I"m troubleshooting an Alesis QS8-1. It is as if the output sound is overdriven (not so bad at very low levels, but about half-way up distorts like NUTS). I did a global reset, hoping that would be an easy fix...
I think the problem is either the DAC, or failing JFETs. I replaced the op-amps and have checked all caps & diodes in the analog audio output circuit. The JFETs are J111A, the DAC is an AK43192 (obsolete?). I'm not sure about scoping it to trace the distortion (what voice for the best waveform?).
Anyone been down this road before?
I think the problem is either the DAC, or failing JFETs. I replaced the op-amps and have checked all caps & diodes in the analog audio output circuit. The JFETs are J111A, the DAC is an AK43192 (obsolete?). I'm not sure about scoping it to trace the distortion (what voice for the best waveform?).
Anyone been down this road before?
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