The Kawai & Teisco Analog Synths Group

I've emailed an inquiry to Celedonia Organ Service.  If they have the 
service manual, I'll order it.

Thanks, all, for the help!

--- In kawai-teisco@yahoogroups.com, "gil_we" <gil_we@...> wrote:
>
> I guess there should be some kind of similarity between the 240 and
> 210. You might do well trying to use the 240's schematics ;)
> 
> An audio probe wil help as well. As I said, already two bad 4066 on
> mine, so I won't be surprised at all if you find a bad one on yours 
as
> well...
> 
> 
> --- In kawai-teisco@yahoogroups.com, "Travis Shire" <boardjunkie@>
> wrote:
> >
> > There are sites which sell the service manual. I got the SM for 
my 240
> > from Celedonia Organ Service. Cost me 15$. I doubt getting 
datasheets on
> > chips will do much for you....you need to know how each IC is used
> in the
> > circuit. Without a schematic you'd likely be chasing your tail.
> > 
> > 
> >   I'm not sure if it's on all the voices; I'll check in the next 
few
> >   days. You're probably right, Gil, about the op amp. AND the need
> >   for a schematic. If I can't find one, I guess I'll just make a 
list
> >   of all the ICs on the synth board, google the datasheets, and
> >   play 'hunt & peck' with the scope. Luckily, I'm not seriously
> >   hobbled without it. I'm really glad that I don't have to depend 
on a
> >   bunch of old, cobbled together gear to gig with, like the old 
days...
> > 
> >   --- In kawai-teisco@yahoogroups.com, "gil_we" <gil_we@> wrote:
> >   >
> >   > My bet is that there's a bad opamp, or another 4xxx chip in 
the
> >   Cutoff
> >   > circuit... Does it happen on all voices ?
> >   >
> >   > I had two bad 4066 in mine, so you might want to check in that
> >   > direction. But again, I think you'll need the schematics.
> >   >
> >   >
> >   >
> >   >
> >   >
> >   >
> >   >
> >   >
> >   > --- In kawai-teisco@yahoogroups.com, "jfloydhumanoid"
> >   > <capstoneliving@> wrote:
> >   > >
> >   > > --- In kawai-teisco@yahoogroups.com, "gil_we" <gil_we@> 
wrote:
> >   > > >
> >   > > > Can you describe the problem more precisely ?
> >   > > >
> >   > > >
> >   > > >
> >   > > > --- In kawai-teisco@yahoogroups.com, "jfloydhumanoid"
> >   > > > <capstoneliving@> wrote:
> >   > > > >
> >   > > > > --- In kawai-teisco@yahoogroups.com, "gil_we" <gil_we@>
> >   wrote:
> >   > > > > >
> >   > > > > > We're still looking for one. The only scans that I 
managed
> >   to
> >   > > get
> >   > > > > was
> >   > > > > > of the main CPU board... (in the Files section)
> >   > > > > >
> >   > > > > >
> >   > > > > >
> >   > > > > > --- In kawai-teisco@yahoogroups.com, "jfloydhumanoid"
> >   > > > > > <capstoneliving@> wrote:
> >   > > > > > >
> >   > > > > > > I bought it new in '84, gigged with it a few years, 
got
> >   > > married,
> >   > > > > & just
> >   > > > > > > dug it out of storage a few months ago. Of course 
the
> >   patch
> >   > > > > memory was
> >   > > > > > > gone, but amazingly the Ni-Cd battery hadn't 
leaked. I
> >   > > replaced
> >   > > > > it,
> >   > > > > > > loaded the factory patches, & it fired right up! 
It's in
> >   > > great
> >   > > > > shape,
> >   > > > > > > except for a sort of 'garbled' artifact in sounds 
with
> >   the
> >   > > filter
> >   > > > > > > somewhat stopped down. If the filter cutoff is all 
the
> >   way
> >   > > open,
> >   > > > > it's
> >   > > > > > > not present. Anybody have a PDF (or other form) of 
the
> >   > > service
> >   > > > > > > manual? I'd be happy to send $ for your trouble...
> >   > > > > > >
> >   > > > > >
> >   > > > > Thanks for looking, Gil... Anybody have any suggestions
> >   where I
> >   > > > > could point my scope probe & discover the origin of this
> >   > > > > unwanted 'distortion'? I'm not afraid to troubleshoot
> >   without a
> >   > > > > schematic...you can't be timid & repair 'vintage'
> >   electronics.
> >   > > > > - J -
> >   > > > >
> >   > > >
> >   > > It sounds similar to the 'overdriven' sound of a tube 
amplifier
> >   > > stage, but 'garbled', and not clipped. When the filter is
> >   completely
> >   > > open, the artifact isn't audible; only when the filter 
cutoff
> >   freq is
> >   > > low enough for the heavily 'filtered' sounds. It also has an
> >   aspect
> >   > > of being periodic (having a set, repetitive pattern), 
suggestive
> >   of
> >   > > possibly being a result of some other signal bleeding 
through,
> >   but
> >   > > that's purely speculative...
> >   > > In the next few days, if it's possible (and allowed) I'll 
post an
> >   MP3
> >   > > in the files section. Would that be proper protol in this
> >   group? I
> >   > > don't have much experience in this area, so please forgive 
me if
> >   > > it 'isn't done'.
> >   > >
> >   >
> > 
> >   
> > 
> > -- 
> > See Exclusive Video: 10th Annual Young Hollywood Awards
> > http://www.hollywoodlife.net/younghollywoodawards2008/
> >
>