[sdiy] Looking for MATRIX 12 information

Doug Terrebonne dougt55 at yahoo.com
Thu May 31 00:41:03 CEST 2012


The top board should be voices 7-12. Kevin has some A bunch of Oberheim ECOs on his synthfool site, not sure if any are M-12 though.

Doug 
synthparts.com

--- On Wed, 5/30/12, John Henson <synthnerd at eircom.net> wrote:

> From: John Henson <synthnerd at eircom.net>
> Subject: Re: [sdiy] Looking for MATRIX 12 information
> To: synth-diy at dropmix.xs4all.nl
> Date: Wednesday, May 30, 2012, 2:35 PM
> Hi everyone,
> yesterday one of Ireland's only Matrix 12's arrived in for
> service.
> Most of it is ok, but there is a PSU issue where the
> switch-mode 
> frequency is audible for an hour
> after switch on, I know it's supposed to be 30kHz, and it
> needs 
> attention but for the time being the
> voltages are of no major concern, all well within Spec.
> I have the Xpander service guide but not the Matrix 12, so
> my question 
> is probably a little silly!
> The two 6 voice modules that sit one above the other, which
> card is 1-6 
> and which is 7-12.
> The two boards are different revisions, as this Matrix 12 is
> no. 9, the 
> lower of the new boards is much
> newer, and I would guess that at some point the whole 6
> voice board was 
> replaced, the engineering
> change orders from the original Xpander are all implemented
> on the pcb 
> of the newer module.
> The problem I'm having is random tuning failures every time
> I tune, but 
> voices 7-12 seem to be the
> worst, failing more completely more often. The tuning
> comparator 
> circuitry is very different between the
> two boards, with a lot of components tack-soldered around
> the newer one.
> Anyone out there have the service manual and/or the ECO's
> for the Matrix 12.
> 
> Regards,
> John.
> > Hi Mike !
> >
> > Until now, the only solution is this kit : http://www.lenham.clara.net/sound/market.html It is
> quite expensive since you have to replace the 3 displays.
> I'm not sure this kit is already available. I'm studying a
> similar product, but I'm not close to the solution ;-)
> >
> > Regards,
> >
> > Christophe
> >
> > Le 30 mai 2012 à 18:37, mike schmidt a écrit :
> >
> >> Thanks everyone for your suggestions! I ended up
> going with little diode in the uk, as suggested by
> christophe. part works great, and was pretty cheap to boot.
> Fwiw, it had a mid 90s date code.
> >>
> >> I have one Final issue with the Matrix, The 20th
> character on the top right display is out. every segment in
> that character is out. Any ideas? Does anyone have a
> replacement for the florescent display? I've swapped the
> driver ics around, in hopes that the problem would follow,
> but alas, it didnt.
> >> Thanks in advance!
> >>
> >> -Mike
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