Thanks for this, it was a good tip to take the extra step and make sure it was actually the chip causing problems, and not some other circuitry. By swapping the chip like you described, I was able to determine that it was indeed the cem3396 acting up. I also realized that it's only a problem on one of the osc's of that chip, and it's with the square wave only, ie the saw was fine. The square was producing some sound, just waaay quieter than it should. I wonder if there is a way to coax a chip like this back to life

Cheers.

--- In oberheim@yahoogroups.com , "hawkberg" <sfcls@...> wrote:
>
> Hi
>
> I am having an issue that seems very similar to yours.
>
> There is a diagnostics setting inside the M100, here:
>
> http://www.retrosound.de/Matrix-1000%20Service.htm
>
> THis lets you see which oscillator is not working properly.
>
> Then I suggest you swap the CEM chips between the faulty one and one of the others....and if the diagnostics say that your problem is with the same oscillator as before, it is NOT the CEM chip but some logic circuit connected to it. The CEMs are easily swapped using a flat screwdriver pr similar, they are not soldered.
>
> I did that, it was not was CEM chip, now I have turned the unit over to a repair guy to have it fixed :-/
>
>
> regards
> Håkon
>
>
>
> --- In oberheim@yahoogroups.com , "dearsharps" <dearsharps@> wrote:
> >
> > Is this the best source for cem3396 these days
> > http://www.maad.net/ms6/index.html
> >
> > On my M1000, one of the voices only plays one osc, so I'm sure it must be a half-dead cem3396. Narrow body for the Matrix 1000 right
> >
> > Thanks!
> >
>