Vintage Synth Repair

-----Mensaje original-----
De: vintagesynthrepair@yahoogroups.com [mailto:vintagesynthrepair@yahoogroups.com]En nombre de gil_we
Enviado el: jueves, 22 de marzo de 2007 10:46
Para: vintagesynthrepair@yahoogroups.com
Asunto: [vintagesynthrepair] Re: Problem with Kawai SX-240.

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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
..> 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" ..>
> >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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