Vintage Synth Repair

Thank you very much for the help and links... I downloaded the service manual annd performed the system intialisation, the problem is still there, but it is not so radical with basic sounds that are in the machine after the intialisation...seems that there may be problems in the DAC...is there any way to find a new one these days?

cheers,
Ami


--- In vintagesynthrepair@yahoogroups.com, Daniel Forró <dan.for@...> wrote:
>
> If you need Service manual, you can download it here:
> 
> http://elektrotanya.com/?q=showresult&what=korg%20O1W&kategoria=&kat2=all
> 
> Daniel Forro
> 
> On May 18, 2012, at 6:06 PM, nemesisem@... wrote:
> 
> > Hi!!!
> >
> > Not sure if Korg O1Wfd is vintage yet, but here goes: My trusty  
> > O1Wfd has developed an irritating error and I would very much like to
> > know where to start to look for the source of the problem.
> >
> > It goes like this: You play a chord and there will be other notes  
> > sounding in
> > addition to those you have played. They play at random time (but  
> > always 1-2
> > sec. after you have pressed the keys for the chord you want) and  
> > they often are
> > one or two of the notes you used in previous chord you played. They  
> > also are
> > louder and slightly distorted in sound. There´s also high pitched  
> > crackle in the
> > background, while the "ghost notes" appear...
> >
> > They seem to have something to do with longer release times and  
> > reverbs, because
> > they hardly ever appear with short sounds with zero attack and zero  
> > release,
> > like "mono lead" etc. Short polyphonic sounds are OK as well, so it 
> > ´s probably
> > not about mono/poly mode...
> >
> > Combi and Prog sounds are most badly affected, but when played via  
> > Seq mode
> > there are much less problems. The shorter sounds are mostly  
> > faultless in seq
> > mode.
> >
> > I would imagine that someone else has also come accross this kind of
> > malfunction, so I would be very thankful for any pointers for the  
> > problem
> > source.
> >
> > I downloaded all data from the factory disk, performed the data dump  
> > from
> > another O1 and tried to play the faulty O1Wfd via midi from other  
> > keyboard, but
> > the problem was always there...
> >
> > thanks in advance for any recommendations,
> >
> > cheers,
> > Ami
> >
> >
> >
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>