Discussion about the Korg PolySix synthesizer

Next step is to begin eliminating possible causes.  Lift the end of R11 
to see if the effect goes away.  Then lift R9.  R11 carries the internal 
mod signal;  R9 carries the signal from the mod wheel.  If the effect 
continues with both of these disconnected, it's coming from somewhere else.
You then have to backtrack through the opamp buffers & demultiplexers 
for the VCO control voltage.
It is sometimes possible on battery-damaged boards for a signal to bleed 
through to other traces.
~G


On 8/10/2015 1:33 PM, moogchild synthdrome moogchild@yahoo.es [PolySix] 
wrote:
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> Definetely not, I've double checked it. Effects off, sawtooth wave. 
> Same slow VCOs modulation (about 5 secs per cycle) independently of 
> the speed of the three LFOs in the Polysix. If I replace the KLM-367A 
> the modulation disappears.
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> El lun, 10/8/15, backshall1@bellsouth.net [PolySix] 
> <PolySix@yahoogroups.com> escribi�:
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> Asunto: Re: [PolySix] VCOs slightly modulated due to battery board 
> malfunction
> Para: PolySix@yahoogroups.com
> Fecha: lunes, 10 de agosto, 2015 20:57
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> How about PWM Speed or Effects Speed? They also have
> their own LFO signal
> that could be bleeding in somewhere.
> Don B.
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