I managed to locate the chips, they seem to be in this order from left to right when facing the unit: 6-5-4-3-2-1....which I found out after accidentally swapping 4 and 5, thinking they were 2 and 3 :-).... but then I did swap the correct 2 and 3....but alas, no change at all: it still says voice 2 is the bad one :-(

so I guess it is not the CEM chip that is the culprit :-(

any other ideas

is there any way to "disable" a voice so that I end up with a 5-voice instrument

regards
HÃ¥kon

--- In oberheim@yahoogroups.com , Peter Mörck <peter@...> wrote:
>
> I believe they're mounted in order 1-6 from left to right with the front panel towards you, but I think it's printed on the PCB as well.
>
> The Matrix-1000 is easy to open. I think it's just 2-3 screws on each side and then the top comes off easily.
>
> If you're buying a replacement 3396, please be aware that there are wide (600 mil) 3396:es also, which are used in the Matrix-6. They're usually called 3396W or WB or something like that.
> The Matrix-1000 (as you will see) uses narrow (300 mil) ones.
>
> Also, be careful if removing the chips so you don't bend/break the pins. Either use an IC-extractor or a flat screwdriver and pry a bit on each end several times. Don't just bend it up completely on one side first, but take it bit by bit so it comes out "vertically" and not as if it's on hinges :)
>
> CEM3396 chips are obsolete but you can usually find them on specialized sites or ebay.
> Judging by your name I would guess you're in Scandinavia :) So... European shops maybe...
>
> http://www.vintageplanet.nl/ seems to have the wide ones but not the narrow ones, so don't buy one of those.
>
> BR,
> Peter
>
>
> ----- Original Message -----
> From: hawkberg
> To: oberheim@yahoogroups.com
> Sent: Sunday, April 21, 2013 11:19 AM
> Subject: [oberheim] Re: Matrix-1000: one voice faulty, replace chip
>
>
>
> Thanks, good suggestion.
>
> I have to admit I havent dared to open it yet, I tend to start with the wrong screws and things fall aport :-)
>
> Will I easily be able to identify which chip is which And there is no soldering, only click-in or whatever the term is
>
> If it proves to be that chip, are CEM 3396 chip still available
>
> regards
> HÃ¥kon
>
> --- In oberheim@yahoogroups.com , Peter Mörck <peter@> wrote:
> >
> > Before you replace:
> > Try to swap the chip for voice 2 with that of another one and see if the problem moves as well.
> > Sometimes just pressing down on the chips to reseat them in the sockets is enough.
> > Removing them or putting them back might help as well.
> > Just don't cuddle with your cat on a nylon carpet before you go in there...
> >
> > BR,
> > Peter
> >
> >
> > ----- Original Message -----
> > From: hawkberg
> > To: oberheim@yahoogroups.com
> > Sent: Saturday, April 20, 2013 12:28 PM
> > Subject: [oberheim] Matrix-1000: one voice faulty, replace chip
> >
> >
> >
> > Hi
> >
> > I recently bought a Matrix-1000, which the seller claimed was in perfect condition. When it arrived, I quickly discovered this was not so :-(
> >
> > One of the voices (or one of the oscillators of one of the voices ) is not functioning properly, the symptoms vary a lot from one patch to another.... from being completely silent to having a wrong pitch or other anomaly)
> >
> > I did return to factory defaults + ran calibration: no effect.
> >
> > Then I put it in "show voices played" mode, and the faulty voice always shows up at voice number 2.
> >
> > Any idea if this means I can have one of the CEM chips in it replaced
> > Anyone with similar experiences
> >
> > grateful for any help or tip
> >
> > regards
> > HÃ ¥kon
> >
>