Vintage Synth Repair

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
>
>
>
>
>
>
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