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2014-12-16 by pasitive@gmail.com
Hi,
I've got Korg Polysix here, with clone KLM367.
There's something wrong with tuning. C-keys are something like F and octave is couple semitones shorter than it should be. It's impossible to get it tuned right. I've been following several calibration instructions without any success.
VR2 has no effect at all.
Is it photocoupler? IC18 pin 7 gives +12v. As I understood it should give something like -2v - -5v, but this one gives something else..
2014-12-16 by Jed Jorgensen
Hi,
I've got Korg Polysix here, with clone KLM367.
There's something wrong with tuning. C-keys are something like F and octave is couple semitones shorter than it should be. It's impossible to get it tuned right. I've been following several calibration instructions without any success.
VR2 has no effect at all.
Is it photocoupler? IC18 pin 7 gives +12v. As I understood it should give something like -2v - -5v, but this one gives something else..
2014-12-20 by pasitive@gmail.com
2014-12-21 by Bob Grieb
How about IC18 and Q3? Are they OK? Also,
there is a 4051 (IC31) in that feedback loop. Maybe it's gonebad?
Bob From: "pasitive@gmail.com [PolySix]" <PolySix@yahoogroups.com>
To: PolySix@yahoogroups.com
Sent: Saturday, December 20, 2014 8:56 AM
Subject: Re: [PolySix] Tuning issue.
PC-1 replaced, without any effect.
Cannot get basic tune to C at all. It's A or A#.
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2014-12-21 by pasitive@gmail.com
2014-12-21 by <backshall1@bellsouth.net>
What part was it that you used to replace PC-1, and did you change any resistors when you tried it? Don B. From: mailto:PolySix@yahoogroups.com Sent: Sunday, December 21, 2014 10:25 AM To: PolySix@yahoogroups.com Subject: Re: [PolySix] Tuning issue. Back to original photocoupler. All works now perfectly.
2014-12-21 by pasitive@gmail.com
2014-12-26 by andrijapusic@yahoo.com
2014-12-27 by <backshall1@bellsouth.net>
I believe he said the real problem was some acid trace damage on the 366 board, and it is working fine now with the original photocoupler and resistor. He didn’t mention where the damaged trace was. Don B. From: mailto:PolySix@yahoogroups.com Sent: Friday, December 26, 2014 4:57 PM To: PolySix@yahoogroups.com Subject: [PolySix] Re: Tuning issue. Can you explain, what is your final solution? Which optocoupler and which resistor?
2014-12-27 by pasitive@gmail.com
2014-12-28 by jw_dewdney@yahoo.com