Alas, that wasn’t it. Solid connections there, and when I measured the output of the ALT buffer I made sure to probe at the input pin of Z46 in the timer circuit, so I know the signal was making it that far. Past that I’m not sure I understand the tuning routine enough to know what I’m looking for. Could it be something in that timing circuit? e > The most likely culprit is a bad connection to the output board. When > tuning, the signal from each channel is routed to a different line (ALT > OUT) to the output board, where it is squared up and fed back to the main > board on the SYNTH ZCD line. It could even be a bad ground to the output > board, which could account for the audio noise, too. > > -- > > Ciao, Paul D. DeRocco > Paul mailto:pderocco@... <mailto:pderocco@...>
Message
Rre: [chromapolaris] failing Polaris autotune
2016-01-25 by Eric Frampton