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Vintage Synth Repair

Index last updated: 2026-04-28 23:41 UTC

Message

Re: Problem with Kawai SX-240.

2007-03-26 by gil_we

That would be great ! we could upload them to the kawai-teisco yahoo 
group. These are very rare, I don't know of any available SX240 
schematics on the net...

Thanks!



--- In vintagesynthrepair@yahoogroups.com, Joan Martínez 
<piniflopa@...> wrote:
>
> If you are interested in SX-240 scheematics I can scan som pages. 
If not, if
> you want the schematic fro the SX-210 you can try to Spanish 
official
> service (infobt@...).
> 
> Regards.
> 
> Joan M.
> 
> 
>   I'd be interrested too. I don't have a Kawai (well, I have one, 
but not
> this
>   one), but I'd like check the schematics for another purpose.
> 
>   >From: "gil_we" <gil_we@...>
>   >Reply-To: vintagesynthrepair@yahoogroups.com
>   >To: vintagesynthrepair@yahoogroups.com
>   >Subject: [vintagesynthrepair] Re: Problem with Kawai SX-240.
>   >Date: Thu, 22 Mar 2007 09:45:31 -0000
>   >
>   >Who did you contact ? I'm trying to get the schematics for the 
SX210
>   >as well.... Could you please email me the one for SX240 please ?
>   >
>   >Many thanks !
>   >
>   >
>   >--- In vintagesynthrepair@yahoogroups.com, Joan Martínez
>   ><piniflopa@> wrote:
>   > >
>   > >
>   > > Hallo Francois!
>   > >
>   > > Oui! I get it The official service in Spain has been very 
kind and
>   >I get the
>   > > schematics form there with no problem at all.
>   > >
>   > > Many thanks!
>   > > -----Mensaje original-----
>   > > De: vintagesynthrepair@yahoogroups.com
>   > > [mailto:vintagesynthrepair@yahoogroups.com]En nombre de 
francois
>   >basquin
>   > > Enviado el: miércoles, 21 de marzo de 2007 19:02
>   > > Para: vintagesynthrepair@yahoogroups.com
>   > > Asunto: RE: [vintagesynthrepair] Problem with Kawai SX-240..
>   > >
>   > >
>   > >
>   > >
>   > >
>   > > Joan, do you have the schematics of this part ?
>   > >
>   > > >From: "Joan" <piniflopa@>
>   > > >Reply-To: vintagesynthrepair@yahoogroups.com
>   > > >To: vintagesynthrepair@yahoogroups.com
>   > > >Subject: [vintagesynthrepair] Problem with Kawai SX-240.
>   > > >Date: Tue, 20 Mar 2007 18:41:49 -0000
>   > > >
>   > > >Hello,
>   > > >
>   > > >I bought some time ago this synth with a lot of problem that
>   >I've been
>   > > >fixing. But now I don't know how to solve the remaining 
problem.
>   > > >
>   > > >I found the problem in cutoff voltage control from D/A
>   >converter. It
>   > > >looks in some of the 8 stages the voltage is right (1st, 
2nd,3th
>   >and
>   > > >5th) but in other is not possible to adjust the Voltage in 
the
>   >SSM
>   > > >filters. I also swap two chips just in case and afortunately 
the
>   > > >SSM2044 are ok. I change the circuit multiplexer and the IC's
>   >that
>   > > >provides de D/A conversion throght the R-Array. Some of the 
wrong
>   > > >stages are just impossible to adjust, other are noisy. My
>   >thinking is
>   > > >that the switching time is delayed between CPU and 
multiplexer
>   >but as
>   > > >I cannot chceck with osciloscope -I don't get one- I'm just
>   >sttoped in
>   > > >that situation.
>   > > >The system (apart from SSM chips) is quite similar to JUNO's.
>   >Does
>   > > >anayone get a similar problem? Or more important does anyone
>   >know thow
>   > > >fix it?
>   > > >
>   > > >Many thanks in advance.
>   > > >
>   > > >Joan M.
>   > > >www.soundclick.com/nolabelavailable
>   > > >
>   > >
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