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
> >
> >Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/ > >
> >
> >