Discussion about the Korg PolySix synthesizer

Sorry, I had a typo in my original question, I am still wondering
what to adjust to get 0V at CN05-7 (_not_ the 8V on CN05-11)

If I adjust VCF CUTOFF to 0V, my max res freq is about 16KHz,
(as mentioned below) VCF RESONANCE has no effect on CN05-7.


Thanks again,

Andreas.  

--- In PolySix@yahoogroups.com, "winzigus <at@t...>" <at@t...> wrote:
> 
> Johannes,
> 
> Thanks for your detailed explantion. I initialy adjusted the
> RESONANCE knob for 8V, unfortunately my max. resonance 
> frequency is about 16KHz in step "VCF fo adjustment", not
> 19 ~ 24KHz.
> 
> The "minimum value of the waveform" is 1.6V (On the scope,
> not DVM), maybe I have to check the D/A offset on the input
> of the DeMux ...
> 
> 
> Cheers,
> 
>    Andreas.
> 
> 
> --- In PolySix@yahoogroups.com, "J. Hausensteiner" <jo.synth@c...> 
> wrote:
> > Hi,
> > 
> > 1) Adjust the RESONANCE knob for a 8.000V reading on the DVM.
> >    When trying to accomplish this you will notice that there
> >    are discrete steps in the value. Because our beloved analog
> >    baby is controlled *digitally* in reality. The analog
> >    control voltages (+/-5V) are digitized with 8 bits
> >    (256 steps), which gives a resolution of about 40mV.
> > 
> > 2) This is misleading in the service manual. They do not mean
> >    the DC component but rather the the *minimum* value of the
> >    triangle waveform is supposed to be 0.2 ~ 0.5V. When you
> >    look at Fig. 4 this will be clear. The average value you
> >    will measure with a DVM will add half of the triangle wave
> >    amplitude, which results in 1.1 ~ 1.6V. So you are still
> >    within spec.
> > 
> > 
> > Cheers,
> > 
> > Johannes
> > 
> > 
> > PolySix@yahoogroups.com,Internet writes:
> > >
> > >Hi,
> > >
> > >After bringing my dead Polysix back to life (Battery leakage,
> > >faulty SSM 2056's) I decided to give him a completely new
> > >calibration.
> > >
> > >There are 2 points in the service manual which I have 
> > >difficulties to understand:
> > >
> > >
> > >- In "KLM-366 check and adjustment", point (3) "VCF RESONANCE
> > >  adjustment":
> > >
> > >  "Check CN05-7 with DVM and adjust to obtain 8.000V +/- 20mV"
> > >
> > >What am I supposed to adjust ?
> > >
> > >- In "KLM-367 adjustment", point (4) "PW/PWM check and 
adjustment":
> > >
> > >  "...confirm there is a DC component of +0.2 ~ +0.5V"
> > >
> > >My Polysix shows an offset of about 1.6V ... any ideas ?
> > >
> > >
> > >Thanks in advance for any hints...
> > >
> > >
> > >Regards, 
> > >
> > >    Andreas.
> > >
> > >
> > >To unsubscribe from this group, send an email to:
> > >PolySix-unsubscribe@egroups.com
> > >
> > >PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
> > >
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> http://docs.yahoo.com/info/terms/ 
> > >
> > >
> > >