Discussion about the Korg PolySix synthesizer

Well, if that is the case ic13 is craped out. Would that cause my synth to play when in
PWM mode but not be able to change the PWM shape or speed?

--- In PolySix@yahoogroups.com, Johannes Hausensteiner <jo.synth@c...> wrote:
> Hi,
>
> How to determine the pin number of an IC:
>
> e.g. DIL-8 case:
>
>
> 8 7 6 5
> +|-|-|-|+
> notch: > |
> +|-|-|-|+
> 1 2 3 4
> ^
> pin no. one
>
> I hope this helps ...
>
> ciscomanvann wrote:
> > OK, when I am looking at the IC how do i know which pin is pin 1? I
> > found one pin on IC12 that measures +/- 4.7 v but no pin that changes
> > on IC13. Hmm
> >
> > --- In PolySix@yahoogroups.com, Johannes Hausensteiner <jo.synth@c...>
> > wrote:
> >
> >>On KLM-367 check the following:
> >>* IC12 (TL072) pin1: must be -5V .. +5V according to PW/PWM poti
> >> if not, replace IC12
> >>* IC13 (4558) pin1: must be -5V .. +5V according to PWM SPEED poti
> >> if not, replace IC13
> >>* Set PWM SPEED to slowest and check IC1 (4066)/pin9: must change from
> >> minus to plus voltage and back (I dont know the exact values; will
> >> be at least -3V..+3V)
> >> if not, replace IC20 (LM13600) and/or IC15 (4558)
> >>* IC1/pin6: must be +5V when WAVEFORM is at PWM position, otherwise 0V.
> >> if not, replace IC3 (LM339)
> >>* IC1/pin8: must be the same as IC1/pin9 when WAVEFORM is at PWM
> >> position, if not replace IC1 (4066).
> >>* TP1 (PW/PWM) near IC12: according to service manual "PW/PWM check
> >> and adjustment"
> >> if not OK, replace IC20 (LM13600) and/or IC15 (4558)
> >>
> >>I hope this helps,
> >>
> >>Johannes
> >>
> >>
> >>ciscomanvann wrote:
> >>
> >>>Nothing happens. It plays, but the width or pwm does not change. I
> >>>have a multimeter, how do i check this stuff out? I dont know a whole
> >>>lot about ICs.
> >>>
> >>>--- In PolySix@yahoogroups.com, The Old Crow <oldcrow@o...> wrote:
> >>>
> >>>
> >>>> First thing to do is set VCO to PW and move the width knob from 0
> >>>
> >>>to 10
> >>>
> >>>
> >>>>and back to 0 and listen to see if it changes accordingly. Then
> >>>
> >>>set it to
> >>>
> >>>
> >>>>10 and change the VCO mode to PWM and move the PWM speed knob from
> >>>
> >>>0 to 10
> >>>
> >>>
> >>>>slowly and note if the cyclic modulation is audible.
> >>>>
> >>>> If nothing is working then I would imagine either IC20 (LM13600)
> >>>
> >>>needs
> >>>
> >>>
> >>>>replaced, or the analog switch section IC1C died and IC1 needs
> >>>
> >>>replaced,
> >>>
> >>>
> >>>>or perhaps the control voltages off deMUX IC19 aren't getting there
> >>>
> >>>and
> >>>
> >>>
> >>>>IC19, IC12 or IC13 is to blame (least likely though).
> >>>>
> >>>> Use my schematic as it is much easier to read than the old
> >>>
> >>>service
> >>>
> >>>
> >>>>manual copy. PWM circuit is on the far right, about 2/3 of the way
> >>>
> >>>down.
> >>>
> >>>
> >>>>It is marked "PWM MG":
> >>>>
> >>>>
> >>>
> >>>http://www.oldcrows.net/~oldcrow/synth/korg/polysix/crowlm367/klm367a_
> >>>eagle_schem.gif
> >>>
> >>>
> >>>> Hope this helps,
> >>>>
> >>>>Crow
> >>>>/**/
> >>>>
> >>>>On Wed, 31 Dec 2003, ciscomanvann wrote:
> >>>>
> >>>>
> >>>>
> >>>>>I know this sounds stupid, but how can i tell if the PWM is
> >>>
> >>>working?
> >>>
> >>>
> >>>>>If it is not, where do I start looking to fix it?
> >>>>>Thanks!
> >>>
> >>>
> >>>
> >>>PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> >>>
> >>>Yahoo! Groups Links
> >>>
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> >>>
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> >>>
> >>>
> >>>
> >>>
> >
> >
> >
> > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> >
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> >
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