Korg DW8000, Mono/Poly, MS-20...

Hi everyone, I know the subject looks rather silly, but I do not know
the better way to describe my problem - english is not my native language.
I just resurected DW8000 I acquired for as much as 100 euros, it was
completely dead and the battery replacement was not the clue here.
Anyway, the synth came back to life but it's just a half of success -
the issue is when I press a key the beast start sounding but it does
not stop when I release the key. Pressing another key toggles another
voice to sound and now two voices sounds forever, etc. That is how it
behaves in Poly mode, in Unison all voices sound together so pressing
another key (and relesing it) causes the previous sound stop sounding
and the one just pressed sounding forever. The strange is that the
sound is not just the sound of selected waveforms but it sounds like
the VCF in big resonance - selfoscilating at a high frequency. Another
important thing here in my opinion is that the mixed signal amplitude
leaving VCA (before it reaches the delay board) is very high and
getting higher each time I press a key. My first suspicious was a
keyboard issue but it was a false - I have tried to trigger the synth
externally via MIDI and it behaves exactly the same way.
I am looking for anyone experienced who might be knowing the way the
analog part of the DW8000 works and can share with me the knowledge. I
have skills but do not have experience and knowledge how the synth
works. I am trying to learn by just reading and analyzing schematics,
but it is very difficult and the Service Manual is ..... actually
useless. I will appreciate any piece of advice.
Thank you.

gupidziadek

> > I just resurected DW8000 I acquired for as much as 100 euros, it was
> > completely dead and the battery replacement was not the clue here.
> > Anyway, the synth came back to life but it's just a half of success -
> > the issue is when I press a key the beast start sounding but it does
> > not stop when I release the key. Pressing another key toggles another
> > voice to sound and now two voices sounds forever, etc. That is how it
> > behaves in Poly mode, in Unison all voices sound together so pressing
> > another key (and relesing it) causes the previous sound stop sounding
> > and the one just pressed sounding forever. The strange is that the
> > sound is not just the sound of selected waveforms but it sounds like
> > the VCF in big resonance - selfoscilating at a high frequency. Another
> > important thing here in my opinion is that the mixed signal amplitude
> > leaving VCA (before it reaches the delay board) is very high and
> > getting higher each time I press a key. My first suspicious was a
> > keyboard issue but it was a false - I have tried to trigger the synth
> > externally via MIDI and it behaves exactly the same way.
> > I am looking for anyone experienced who might be knowing the way the
> > analog part of the DW8000 works and can share with me the knowledge. I
> > have skills but do not have experience and knowledge how the synth
> > works. I am trying to learn by just reading and analyzing schematics,
> > but it is very difficult and the Service Manual is ..... actually
> > useless. I will appreciate any piece of advice.
> > Thank you.
> >
> > gupidziadek
> >
> >  
> >
>

> >I just resurected DW8000 I acquired for as much as 100 euros, it was
> >completely dead and the battery replacement was not the clue here.
> >Anyway, the synth came back to life but it's just a half of success -
> >the issue is when I press a key the beast start sounding but it does
> >not stop when I release the key. Pressing another key toggles another
> >voice to sound and now two voices sounds forever, etc. That is how it
> >behaves in Poly mode, in Unison all voices sound together so pressing
> >another key (and relesing it) causes the previous sound stop sounding
> >and the one just pressed sounding forever. The strange is that the
> >sound is not just the sound of selected waveforms but it sounds like
> >the VCF in big resonance - selfoscilating at a high frequency. Another
> >important thing here in my opinion is that the mixed signal amplitude
> >leaving VCA (before it reaches the delay board) is very high and
> >getting higher each time I press a key. My first suspicious was a
> >keyboard issue but it was a false - I have tried to trigger the synth
> >externally via MIDI and it behaves exactly the same way.
> >I am looking for anyone experienced who might be knowing the way the
> >analog part of the DW8000 works and can share with me the knowledge. I
> >have skills but do not have experience and knowledge how the synth
> >works. I am trying to learn by just reading and analyzing schematics,
> >but it is very difficult and the Service Manual is ..... actually
> >useless. I will appreciate any piece of advice.
> >Thank you.
> >
> >gupidziadek
> >
> >
>