Discussion about the Korg PolySix synthesizer

There' a lot of info about these type of problems on the archives,
just search ;)

Basically what you have is an acid eaten board (KLM367),
you need to retrace and replace the ICs around the battery area.

I must say that although I already fixed a few, the last one was a
pain and I ended up returning it to the owner. I fixed most problems
except for the memory selector which was acting strangely, again check
the archives.

--- In PolySix@yahoogroups.com, "mydadvsyours" <arturo00@...> wrote:
>
> Hey there. I'm in the process of fixing one of my polysixes. I'm
pretty close to complete. I 
> have a few remaining issues and was just wondering if any of you
could tell me exactly 
> where/what on the KLM-367 board I'd need to fix in order to get
these issues resolved. (I 
> know that most of the problems revolve around the 7408's at IC31 and
IC32...). As 
> mentioned, I have another polysix that i'm using for parts and have
pretty much swapped 
> all of the boards...and the problems mentioned above are still present.
> 
> Here are my problems:
> 
> - Chorus always on (no difference between either of the 3 effects,
but speed/emphasis 
> adjustment still works)
> - Bank D and Program 4 or 5(?) lights stay on all the time
> - VCO selector only outputs Sawtooth and PWM waveforms
> - Attenuator doesn't do anything (but the EG selector seems to work
ok...now!)
> - Mod wheel has no effect
> - The memory section is a little wonky
> 
> So yeah, any help or suggestions would be greatly appreciated...
> 
> Arturo.....
> 
> ps. Also, i'd like to not have that second polysix goto waste. does
anyone know if its 
> possible to use the circuit boards for other applications (ie.
external filter, wave generator,  
> etc). If you know of any sites that show how to frankenstein polysix
modules, lemme 
> know!
>