Discussion about the Korg PolySix synthesizer

I was never able to figure out what the cause was.  I went through 
everything on that side of the board and couldn't find a bad 
connection or failed component.  Good luck!


--- In PolySix@yahoogroups.com, "brainslayer666" <brainslayer@c...> 
wrote:
> 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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