[sdiy] broken oberheim matrix 6r

[Danjel van Tijn]

Hi karl,

Does the 8253 timer commonly fail? I will definitely check it out...

thanks for the tip!

Danjel

On 4/4/07, karl dalen <dalenkarl at yahoo.se> wrote:
> Have you checked the 8253 timer?
>
> If these dont work you wont get any sound!
>
> KD
>
>  for the  os
> --- Danjel van Tijn <syntheticdan at gmail.com> skrev:
>
> > Hi Guys,
> >
> > I tried to send this out a while ago but the list was onbiously down.
> > I recently took a gamble to buy a broken Oberheim matrix 6r.
> > The unit turns on, receives midi but no sound out. I thought it might
> > be a problem with corrupt memory data but no amounts of resets or self
> > callibration have worked (nor has re-programming voices from a PC).
> > When I run callibration I get the following errors:
> > Bad Wave 63
> > Bad Res 63
> > Bad VcF 63
> > which basically means that all the voice chips are failing the callibration.
> >
> > I have tried re-seating all connectors, cleaning the pins of the
> > cem3396 chips (in case of oxidation), I checked all power rails and
> > have tried to trace through signals with a scope.
> > It looks like the CEM3396 chips are receiving the appropriae
> > corresponding signal changes (e.g. if I edit a parameter I see changes
> > at the inputs of a voice chip). However, the refference signal to the
> > chip is very very low amplitude and saw haped. Also I get no audio out
> > of the voice chips.
> >
> > What are the chances that all 6 voice chips spontaneously died? I have
> > ordered a sigle replacement chip to see if that makes a difference for
> > a single voice.
> >
> > Any other clues as to what may be wrong???
> >
> > thanks!
> > Danjel
> >
> > --
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> > www.myspace.com/intellijel
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>
>
>
>
>
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