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On Sunday, 21 August 2016, 7zlwncpbis4x22jwvkd4oc5hzu2njcsjeup42is6@yahoo.com [PolySix] <PolySix@yahoogroups.com> wrote:Hi Patrick,
It does not recall on boot.Trying to edit any sound causes weirdness. The only way to get a working sound is by punching random buttons, or turning knobs until one happens by. You also get noises that sound the same on all keys, and sometimes just constant static and/or noise.For example, turning the VCA Attenuator switch will cause it to go through several different settings, some which have sounds and some not. It might also light up the Manual or Write buttons. The likelihood of getting an actual patch is about 10%. I see no repeating pattern.The bank and program buttons do not work reliably.It will not go into Manual mode, and does not power up the same each time. It seldom powers up with A-1 lit, as I believe it is supposed to do (please correct me if I'm wrong), and when it does, changing almost any parameter will cause randomness.After putting a scope on it, I notice the same sine shape on all test points in the KLM-367 (including ground), except TP2, which has the same amplitude sine, but with smaller square wave distortions.After looking more closely, I see that the signal remains a pure sine until it leaves IC 27 via pin 1. It comes out of IC 33 pin 4 pure and enters IC 27 clean on pins 2, 6, and 7, as it should according to the schematic.Should I be suspicious? Is any of that normal or does it indicate problems with IC 27 or associated components?Thanks again to all for help. I'm determined to fix this, but have little experience with digital circuits.