Korg Poly800/EX800 Users

Hi All,

as I mentioned in my previous message - I'm having Poly-800 Chorus
problem. When I turn the power on and quickly press the keys - I
really hear the chorus (stereo sound) for 1 or 2 seconds and then it's
gone - the sound is pure mono (completely centered and no modulation).
Changing the parameter #48 doesn't have any effect (still mono sound).

I will of course dig into this deeper (and post the details here), but
before doing this I'd like to hear your advice, maybe it's a common
issue and somebody already knows how to fix it.

So, do you have any thoughts on this?

Best, Saulius

Okay, nevermind, I already fixed this...

The problem was with unstable Chorus LFO oscillation. Not sure about
the exact reason, but I was able to find a quick workaround - adding
10M (yes, weird - it's quite large value) resistor in parallel to C44
completely solved the problem and LFO is stable now (and Chorus works).

So, my Poly-800 is ready for Hawk-800 :-).

Best, Saulius

--- In korgpolyex@yahoogroups.com, "saulius_pocevicius" <saulius@...>
wrote:

>
> Hi All,
> 
> as I mentioned in my previous message - I'm having Poly-800 Chorus
> problem. When I turn the power on and quickly press the keys - I
> really hear the chorus (stereo sound) for 1 or 2 seconds and then it's
> gone - the sound is pure mono (completely centered and no modulation).
> Changing the parameter #48 doesn't have any effect (still mono sound).
> 
> I will of course dig into this deeper (and post the details here), but
> before doing this I'd like to hear your advice, maybe it's a common
> issue and somebody already knows how to fix it.
> 
> So, do you have any thoughts on this?
> 
> Best, Saulius
>

Saulius,

Your HAWK-800P kit was shipped out to you today.

Let me know as soon as you get it.

Mike.

--- In korgpolyex@yahoogroups.com, "saulius_pocevicius" <saulius@...>
wrote:

>
> Okay, nevermind, I already fixed this...
> 
> The problem was with unstable Chorus LFO oscillation. Not sure about
> the exact reason, but I was able to find a quick workaround - adding
> 10M (yes, weird - it's quite large value) resistor in parallel to C44
> completely solved the problem and LFO is stable now (and Chorus works).
> 
> So, my Poly-800 is ready for Hawk-800 :-).
> 
> Best, Saulius
> 
> --- In korgpolyex@yahoogroups.com, "saulius_pocevicius" <saulius@>
> wrote:
> >
> > Hi All,
> > 
> > as I mentioned in my previous message - I'm having Poly-800 Chorus
> > problem. When I turn the power on and quickly press the keys - I
> > really hear the chorus (stereo sound) for 1 or 2 seconds and then it's
> > gone - the sound is pure mono (completely centered and no modulation).
> > Changing the parameter #48 doesn't have any effect (still mono sound).
> > 
> > I will of course dig into this deeper (and post the details here), but
> > before doing this I'd like to hear your advice, maybe it's a common
> > issue and somebody already knows how to fix it.
> > 
> > So, do you have any thoughts on this?
> > 
> > Best, Saulius
> >
>

Hi Mike,

great, thanks very much!

I will let you know when the kit is here.

Best, Saulius

--- In korgpolyex@yahoogroups.com, "korgpolyex800" <korgpolyex800@...>
wrote:
>
> Saulius,
> 
> Your HAWK-800P kit was shipped out to you today.
> 
> Let me know as soon as you get it.
> 
> Mike.
> 
> --- In korgpolyex@yahoogroups.com, "saulius_pocevicius" <saulius@>
> wrote:
> >
> > Okay, nevermind, I already fixed this...
> > 
> > The problem was with unstable Chorus LFO oscillation. Not sure about
> > the exact reason, but I was able to find a quick workaround - adding
> > 10M (yes, weird - it's quite large value) resistor in parallel to C44
> > completely solved the problem and LFO is stable now (and Chorus
works).
> > 
> > So, my Poly-800 is ready for Hawk-800 :-).
> > 
> > Best, Saulius
> > 
> > --- In korgpolyex@yahoogroups.com, "saulius_pocevicius" <saulius@>
> > wrote:
> > >
> > > Hi All,
> > > 
> > > as I mentioned in my previous message - I'm having Poly-800 Chorus
> > > problem. When I turn the power on and quickly press the keys - I
> > > really hear the chorus (stereo sound) for 1 or 2 seconds and
then it's
> > > gone - the sound is pure mono (completely centered and no
modulation).
> > > Changing the parameter #48 doesn't have any effect (still mono
sound).
> > > 
> > > I will of course dig into this deeper (and post the details
here), but

> > > before doing this I'd like to hear your advice, maybe it's a common
> > > issue and somebody already knows how to fix it.
> > > 
> > > So, do you have any thoughts on this?
> > > 
> > > Best, Saulius
> > >
> >
>