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| Hello everybody, I have a tuning issue with my polysix. The opto isolator does not seem to be the problem. But I am not sure. I measured about -3V at pin 7 of IC 18. I got it from this source: http://snw.lonningdal.no/p6/Polysix%20Opto.jpg So the opto isolator should not faulty part. The general problem is that during the tuning process the Polysix suddenly has more than one semitone drift down (c to something about b/b#) and basically does not hold the tone after switching it off and power it on again on next day. Do you have an idea where could I could start with troubleshooting? Thanks in advance. regards Igor |