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!
> >>>
> >>>
> >>>
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> >>>
> >>>
> >
> >
> >
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