Discussion about the Korg PolySix synthesizer

I had a similar problem, also on voices 5 and 6. I thought maybe it was a
problem with IC38 or C55, C56 or something in that area since the problem
got worse if I touched anything there. The heat from a finger on IC38 or C55
would send the oscillator soaring in frequency with some harsh overtones.
The other four voices didn't react this way. There was a lot of dirt and
gunk on that corner of the board so I sprayed it with deoxit until it was
running off the edges. I did a lot of cleaning and then tried it again. It
was worse than ever. I think it took several hours for all the deoxit to
completely evaporate from under the chips before it started to sound right
again. I should have had a can of air to blow out under the chips. Anyway,
after a couple of thorough cleanings like this and many hours of drying
time, I think the problem is gone. It definitely got worse before it got
better. Maybe the cooling effect of evaporating deoxit messed up the
calibration and it had to get back to room temperature to work right.
Don B.

  _____  

From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
synth.junkie
Sent: Thursday, March 18, 2010 7:15 AM
To: PolySix@yahoogroups.com
Subject: [PolySix] Re: Polysix problem- two voices are defective . Need help


  

Thanks for the reply.
I have swapped over both the SSM2044 (IC32) and SMM2056 (IC34)from a working
voice and the problem still exists. Tried it on both faulty voices. 
This polysix originally had the leaking battery fault on the KLM 367 board
which I fixed but was left with 2 faulty voices.
thanks 


--- In PolySix@yahoogroups <mailto:PolySix%40yahoogroups.com> .com, Andrew
Jury <andy@...> wrote:
>
> Well, a nice easy one to try would be a swap the EG chip (IC34) from a
> working voice and then the filter chip from (IC34) to see if the voice
> quality improves. Try that to start with and see how you get on...
> 
> Cheers,
> Andy
> 
> 
> On 11/03/2010 12:46, "synth.junkie" <friends-inmyhead@...> wrote:
> 
> > 
> > 
> > 
> > 
> > 
> > I have a polysix with the last 2 voices defective (voice# 5&6)
> > The defective voices makes a distorted, metallic type sound. The other 4
> > voices and all the functions are working ok.
> > Has anyone experienced this problem before? Which board would causing
this
> > problem? 
> > 
> > 
> > 
> > 
> > 
> 
> 
> 
> [Non-text portions of this message have been removed]
>






[Non-text portions of this message have been removed]