Discussion about the Korg PolySix synthesizer

Hi Roman,

I read through the the Sputniik/Aero thread and he looks like he's a
bit further on than me!

I found one really short trace which was broken and fixed that, I
don't know if there is a map of where the traces go because it's
difficult when they are under IC's etc. Anyway I've been thorough and
I can't see any problems with them. However I am prepared to be proved
wrong.

I didn't give a complete analysis of everything that's wrong with my
machine:

- The octave is only switchable between 16' and 8', 4' sounds the same
as 16'

- PW functions exactly the same as PWM

- The Sub Osc will take the Polysix out of Manual mode when switching
to -1, but you can just press Manual again. -2 does the same but
Manual won't work with the switch in that position.

- The VCA Attenuator isn't working at all

I tested the pins on CN03 and I get these results:

pin 1 varies between -5v and +4v depending on where the Effects
Speed/Intensity knob is
pins 2,3,4 are all reading 0.1v constantly
pins 5,6 are constant around -4-5v
pin 7 changes from around -5v to +5v depending on where the Resonance
knob is. 

I'm going to test CN06 and i'll tell you what I find there shortly.
Thanks for the help,

Rich



--- In PolySix@yahoogroups.com, "Roman" <modular@...> wrote:
>
> about the effect problem - measure the voltage at CN03 on KLM367 and
see if
> they change when you turn the following:
> effect speed
> effect type
> VCA attenuation
> VCF resonance
> you should also see slow changing voltage if you have selected VCA
> modulation by LFO
> If they change, and not stay the same all the time, then your effect
board
> might be broken. But if one pins of CN03 doesn't appear to carry
changing
> voltage no matter what switch/pot you turn from above mentioned -
that means
> you still have some traces broken after battery leakage. If you also
say you
> cannot save - the fault may be in CN06 area, as aero/sputnik979 have
> discovered recently.
> 
> Roman
> 
> ----- Original Message -----
> From: "rignellio" <rignellio@...>
> To: <PolySix@yahoogroups.com>
> Sent: Sunday, July 30, 2006 3:18 PM
> Subject: [PolySix] Polysix: effects don't work, has to be in manual
mode to
> sound
> 
> 
> > Hi,
> >
> > I've read through some posts on similar lines but couldn't find much
> > that specifically related to my problem. Apologies in advance because
> > I know you get these kind of posts all the time.
> >
> > I got a Polysix recently for next to nothing, the battery had leaked
> > but from a quick inspection it looked reasonably healthy, plus it
> > still made sound.
> > So i proceeded to follow the Polysix battery replacement procedure on
> > Old Crow's site, and now it is working better than before but still
> > has some major functions missing:
> >
> > a) The programmer isn't working, and it has to be in Manual for it to
> > work properly. Nothing can be saved to the memory.
> >
> > b) Also none of the effects work, and it has to be set to 'Phaser' for
> > it to sound at all. Note there is no Phaser effect audible and the
> > Speed/Intensity knob has no effect.
> >
> > So I reckon either a chip or a combination of traces are faulty. Most
> > of the pins around the chips look ok but I'm very inexperienced with
> > electronics. But hey, I got this far.
> > How can I test IC31 or IC22 for problems? And if they are broken, can
> > anyone recommend a place to get spares in the UK?
> >
> > Thanks,
> > Richard
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>