Discussion about the Korg PolySix synthesizer

mborish_2000 wrote:
>  
>
> That solved it.
>


OK. To restore the mod circuit without the noise:
On the bottom of the CPU board, cut the trace from pin 2 of CN06;
solder a wire from pin 2 to the free end of R9 (the resistor previously 
desoldered).
The correct end is the one closest to CN05.
This should restore all VCO mod functions, without the bleed through.

> Thank you so much Klosmon. Unsuprisingly, I discovered another problem 
> after the first one. My Effects section is always engaged and is 
> producing some strange ring modulation type sounds depending on the 
> value of the speed/intensity knob. Is this related to the first problem?
>




As Andrew stated in another post, this is probably due to an incomplete 
battery leak repair job.
Could be a latch,  data line, etc.

~GMM
 
>
>
> -Mike
>
> --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>, 
> klosmon <klosmon@...> wrote:
> >
> > One frequent problem with the CPU board can cause unwanted 
> modulation of
> > the VCO, which can sound like what you're describing.
> > To see if this is the case, get a soldering iron & lift one end of R9,
> > which is a 10K resistor located between IC8 and CN05.
> > This will disconnect all modulation to the VCO; if it eliminates the
> > problem, let me know, and I'll describe where to go f rom there.
> >
> > ~GMM
> >
> > mborish_2000 wrote:
> > >
> > >
> > > I've got a few problems that I can't figure out. Unfortunately, my 
> LFO
> > > is bleeding into the VCA? and I can't figure out a way to stop it.
> > > It's not a violent bleed but it's enought to make the Polysix
> > > unusable. If I turn all of the controls down, it is still there. All
> > > of the controls are functional. All of the potentiometers test out 
> OK.
> > > I tested all cables for continuity. I cleaned the LFO modulation
> > > select switch and replaced the 4051 on KLM 369 without any luck. I
> > > read somewhere that somebody suggested cutting a trace, but they
> > > couldn't remember enough details about what they did. I didn't see 
> any
> > > calibration proceedure related to the LFO modulation either.
> > > Everything else works fine.
> > >
> > > Does anybody have any suggestions? Logic and microprocessing are
> > > really beyond my knowledge.
> > >
> > > -Mike
> > >
> >
> >
> > >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
> 



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