Discussion about the Korg PolySix synthesizer

in the last month we are talking about an lfo issue that sounds like
a distortion. and voila, now i get the same problem. really strange.
if i adjust the phaser/chorus speed, i get strange sounds and i'm
unable to restore it back. and from this point its impossible to
disable the lfo level too. some sliders are doing really strange
things (sustain adjusts cutoff eg).
mmh so far it can't be the IC30/31 problem, since i already replaced
it. (and i changed it again, to check if something is damaged again)
did someone found a solution for this problem?


--- In PolySix@yahoogroups.com, "BrainSlayer" <brainslayer@c...>
wrote:

> if you trigger the lfo to frequency oscillation and adjust the lfo

frequency to maximum, you will get also very heavy distorted sounds.
and that sounds like the IC30/31 problem. but i discovered also
other issues that effects the lfo. the cables from the board to the
top the control board are very short. sometimes if i open my case
they lost the contact and i get strange effects too

> ----- Original Message -----
> From: toorglick
> To: PolySix@yahoogroups.com
> Sent: Monday, July 19, 2004 5:58 PM
> Subject: [PolySix] Re: Son of a b****
>
>
> Yeah, it sounds more like the or *a* LFO gone haywire, but at a
> frequency where it sounds more like distortion.
>
> The only other conclusion I can come to is that I fried IC30

when

> installing the new chip. The electronics store I go to didn't

have

> any 14 pin IC sockets. Maybe I'll stop by Radio Shack to see if

they

> do. That and the initial I repairs I made weren't robust enough

or

> didn't catch everything breaking down.
>
> Fortunately I have five more 74LS08's left!
>
> One thing I noticed while checking traces and other connections

on

> the board is that not all of the connections read the same

value,

> though they all fall within certain value groups, as it were.

Would

> anyone mind telling me what I should be seeing?
>
> Also, can anyone tell me what R17 is? On the schem it's

called "RKC

> 1/8 88 10k". What does it do? Can I get a new one readily?
>
> The reason I ask is because I'm thinking about starting from

scratch;

> removing the jumps I made before; replacing ICs 30 & 31 and

possibly

> R17. Since I've had my Polysix and have seen pictures of

others'

> KLM367s it looks as though mine was/is in pretty rough shape. A

lot

> of the solder points above the battery area are dull, and some

have

> visibly corroded. I've checked them all, include a lot of what-

are-

> they-called? vias? (the areas where the path switches from the

bottom

> to the top and vice-versa) and all check out, but some

look "bad."

>
> Anyway, that's my story. I really prefer to be playing instead

of

> fixing, but nothing sounds like a *real* Polysix and thus I'm
> addicted. Any input is appreciated.
>
>
> --- In PolySix@yahoogroups.com, "BrainSlayer" <brainslayer@c...>
> wrote:
> > sounds like a lfo problem
> > ----- Original Message -----
> > From: reidar@j...
> > To: PolySix@yahoogroups.com
> > Sent: Monday, July 19, 2004 1:47 AM
> > Subject: Re: [PolySix] Son of a b****
> >
> >
> >
> > That sounds like what my P6 is doing too - like the mod

wheel is

> fully on.
> > Everything is 'bubbling'. I have found that the PWM width
> control seems to
> > have the best effect on it, but also, if I leave the P6

switched

> on for an
> > hour or so, it goes away. I'm not an electronics-type, so I
> really don't
> > have a clue, but the fact that it goes away (usually) after

a

> long warm-up
> > might mean something to some of you?
> >
> > Reidar
> >
>
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
>
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