Astral Keys Posted September 13, 2018 Share Posted September 13, 2018 Hello everyone. Over the past month I've acquired two SK-1s in various states of grime and battery leak and got them all cleaned and going. When in "normal" mode, the keyboard should have 4-note polyphony. A problem I see in both SK-1s is that the polyphony fails & it doesn't even revert to mono, worse, the note you strike fails to trigger. These SK-1s are 32 or 33 years old! Are any of you familiar with this old glitch? I feel almost baffled that it happens in both keyboards. And guess what? Sometimes the polyphony just magically works correctly. Very rarely though. Thanks! Quote Link to comment Share on other sites More sharing options...
Brad Saucier Posted September 13, 2018 Share Posted September 13, 2018 Interesting. I'm not familiar with it, but it seems like that might be an intermittent break in a circuit. Quote Link to comment Share on other sites More sharing options...
Steplogik Posted September 16, 2018 Share Posted September 16, 2018 Did you clean the key contacts? There might be noise or ghosting on the keyboard matrix causing polyphony problems. Quote Link to comment Share on other sites More sharing options...
Astral Keys Posted September 16, 2018 Author Share Posted September 16, 2018 I did do a pretty full disassemble but that may have been my downfall here. I will try that & report back in a few days. Thanks for the tip. -- J Quote Link to comment Share on other sites More sharing options...
CYBERYOGI =CO=Windler Posted November 6, 2018 Share Posted November 6, 2018 The SK-1 employs analogue envelope generators, routing the 4 waveform channels through each a VCA. If anything goes wrong here, it may make continuous tones or lack certain channels. The service manual with schematics can be found on Elektrotanya etc. Quote Link to comment Share on other sites More sharing options...
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