Discussion about the Korg PolySix synthesizer

Having repaired several dozen of these, I would say that visual inspection 
of the traces is not sufficient; there can be damaged traces under the ICs, 
and damaged through-holes -- none of which will be visible.

The only way (short of viewing each line with a scope) is to get hold of 
the schematics and use a continuity probe to trace each of the data & 
address lines.

Keep in mind that EVERY audio feature of the P6 has control voltages that 
originate from the CPU board -- one damaged or shorted data line can 
interfere with the functioning of any number of features (filter cutoff, 
ADSR amount, etc).

~GMM


At 08:45 AM 6/5/2007, you wrote:

>Yes, you have damaged traces. Check each one, one at a time. Use a
>magnifying glass if you need to.
>
>On 6/5/07, analog_audio01 
><<mailto:analog_audio01%40yahoo.de>analog_audio01@yahoo.de> wrote:
> > hello,
> >
> > I have a big problem with my polysix.
> >
> > everything is fine, but when I turn it on, after a minute or two the
> > filter makes some strange modulations.. sounds a bit like fm ... I
> > will post an audio file soon...
> >
> > I already changed the voice pcb from another polysix, and found out
> > that there's a problem with the digital board (klm367).
> >
> > I already changed all electrolytic caps from the klm367, but no
> > improvement. I replaced the battery some days ago, the original
> > battery was only leaked a bit, but the pcb was clean and all traces on
> > the pcb are looking good.
> >
> > do you have an idea what could be a reason for this problem...??
> >
> > thanks,
> > mat
> >
> >
> >
> >
> > PolySix "Digiest" Page: 
> <http://www.acc.umu.se/~amber/Poly6>http://www.acc.umu.se/~amber/Poly6
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>--
>.sig
>-Chromatest J. Pantsmaker
><http://www.chromatest.net>http://www.chromatest.net
>


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