Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

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Subject: Re: [PolySix] Re: Key assign mode issue

From: Bob Grieb <bobgrieb@yahoo.com>
Date: 2015-05-04

If you post any more photos, please use more of the screen by setting the volts/div smaller,
so that we can see more detail.   Also, please tell us what the setting is so that we can
interpret what we are seeing.   Also, we need to know where ground is on the scope.

And on a waveform that's repeating, usually you would zoom in so that one cycle of
it fills the screen.   Then say that it was repeating.   That way we can see the most
detail.

Thanks
From: "mpe1969@tpg.com.au [PolySix]" <PolySix@yahoogroups.com>
To: PolySix@yahoogroups.com
Sent: Monday, May 4, 2015 7:12 AM
Subject: Re: [PolySix] Re: Key assign mode issue

 
Thanks, I had another look tonight. I tried to upload some oscilloscope photos but they didn't seem to save to my album. 
IC9 has a dc around -2 to 2.5v that rises to about -0.5 then drops to around -4v then returns to around -2.5v. (as a pattern) I took some photos..... Hitting keys does not seem to influence this pattern
Ic39 (the one above ic31) does not have anything happening on pin3. IC31 has -10v on pin3.
I was about to replace ic31 but thought I would hold off as ic9 doesn't seem to be doing what you described.
Will try again with the photos!
Thanks again