If those 3396's are cooked internally then they're done. My best answer for the failure would be that something else upstream in the circuitry is wearing out possibly causing stress and eventual failure on them. ...just a guess without a whole lot of basis at this point. The CEM 3396 is still a pretty cheap IC to replace and available from a few Ebay sellers for as cheap as $5 or $6 a piece, not much compared to a CEM 3310, 3320 or 3360, etc. that can go from as low as $40 to $50 on up.

--- In oberheim@yahoogroups.com , Jill Saphic wrote:
>
> well then!
> quite the list of "hot tips" for the Matrix!
> thank you to David,Peter,Paul & Wesley
> alright then,
> Â  I have a question, sparked by the last response.
> I have purchased 3,   (yes  THREE LOL!!!)   Matrix 1000s used on Ebay
> just to take the chips out to replace  the "non responsive":  ones in my rack 1000s.
> One of them only had three functioning 3396s,
> I haven't thrown them away, just have them saved in a baggie.
> and I wanted to ask does anyone know if the 3396s  are able 2 B repaired
> And 1 big question, Why, out of all the "chips", and things in our Matrix's,
> do these little buggers fail But everything else just keeps humming along
> without many problems considering how long they've been played.
> Or am I misinformed and they just need some type of service
> Â  
> Â  And if anyone is curious, yes I have a DAW, with the newest OPOX Pro 2,
> I just can't take a chance of software failure in my job, For me, hardware
> is extremely reliable mostly. And I keep them because I love the Oberheim sound.
> and I think most that hire me like that I have it at a moments notice.
> Which is why I also have an old  Yamaha TX-802 racked, same reason.
> But I wouldn't  be comfortable  traveling with an OB8, or an OB Xa,
> so I have the 1000s. I just wished they were capable of the split/layer mode
> of the Matrix6 and 6r. LOL!!!   never satisfied are we...
>
>
> --- On Fri, 11/1/13, wesleyknick wrote:
>
>
> From: wesleyknick
> Subject: [oberheim] Re: Matrix-6/ -6R tuning
> To: oberheim@yahoogroups.com
> Date: Friday, 11 January, 2013, 22:31
>
>
>
> Â  
>
>
>
> An effective and easy repair if you're solder saavy in the event a broken pin, is to put a small puddle of solder on the upper end of the wider metal tab above the broken pin coming out of the IC and lay a clipped lead from a resistor (typically 1/4 watt) in it and clip it flush with the other leads. Just need a way to lay the IC on it's side (usually by placing a small weight on the opposite set of pins pinning it to your workspace tabletop) to make it stand up to proceed with the above procedure. May sound a bit like it's easy to damage the IC but if you minimize the heat to the IC it easy to do and a procedure I've done on several ICs. A smaller lead such as from a 1/4 watt resistor works best and the lead will bend as necessary when the IC is seated. It works great certainly beats throwing away an otherwise valuable and vintage IC...!
>
> --- In oberheim@yahoogroups.com , Paul Cunningham wrote:
> >
> > Use an IC Extractor tool and BE VERY CAREFUL. Practice on something you don't like first. It's very easy to break those old pins off. -pc
> >
> > On Jan 11, 2013, at 2:41 PM, "Loveslap! Recordings" wrote:
> >
> > > how do you do it without breaking the pins off
> > >
> > >
> > > On Fri, Jan 11, 2013 at 4:33 PM, Peter Mà ƒÃ‚ ¶rck wrote:
> > >>
> > >>
> > >> Also please note the crappy IC-holders the CEM3396 chips are sitting in.
> > >> Giving the chips a few firm pushes with your thumb (or completely remove them and put them back IF YOU KNOW HOW TO DO IT WITHOUT BREAKING THE PINS OFF) will reseat them and sometimes help as well.
> > >>
> > >> After that, do the calibration thing and hopefully it will behave a bit better.
> > >>
> > >> /Peter
> > >>
> > >>
> > >> ----- Original Message -----
> > >> From: Dave Garfield
> > >> To: oberheim@yahoogroups.com
> > >> Sent: Friday, January 11, 2013 7:20 PM
> > >> Subject: Re: [oberheim] Matrix-6/ -6R tuning
> > >>
> > >>
> > >> Hi Jill, and other Matrix-6/-6R owners,
> > >>
> > >> Having owned my M-6 since 1986, I've learned a lot about its quirks. One of those is the tuning... At times it seems to be permanently out of tune, and hitting the TUNE button doesn't seem to bring it back.
> > >>
> > >> There IS a solution. The first thing is to let the Matrix warm up for about 10-15 minutes before trying to tune it, as temperature changes will affect tuning (How's THAT for analog-iness ). Once it is warm, go to the MASTER section, select Parameter #52 (CALIBRATION) and affirm that you want to calibrate it. On the Matrix-6, move both Pitch and Mod. levers back and forth from stop to stop a couple of times, then let them come to rest at their respective "zero" positions. This will guarantee that the calibration procedure sees the levers at zero.
> > >>
> > >> Calibration will take about 10 seconds or so. Near the end, you may hear the filters being swept very faintly - that's normal. When finished, the display will return to "Calibrate Y/N " And now, hit that TUNE button again... It could take a try or two to get the Matrix into perfect tune - but it should go there, barring any internal problems.
> > >>
> > >> Now that you've got the Matrix in tune, you can further "analogue" it by introducing pitch variations. One of the most analog-y effects is the tendency of VCOs to go flat at higher frequency. If you want this, then turn Off Keyboard Tracking on one of the DCOs. Now go to the MATRIX MODULATION page, and set KYBD to modulate that same DCO to "62" (Normal KYBD tracking would be "63"); this will give you that slight flat pitch at upper freq's.
> > >>
> > >> You can also simulate dirty key contacts/jumpy oscillators by using one of the LfOs, set at SPEED "0" (to very slightly modulate one of the DCO's pitches via the MATRIX MOD page. (The "0" setting will change pitch only when a key is pressed, and a RANDOM LfO setting will give you a very slight shift on each new note).
> > >>
> > >> Hope that this will help any and all of you out. I've not worked with the M-1000, so I don't remember if it has the same calibration/tuning capabilities, but if so, the above should work.
> > >>
> > >> HAPPY SYNTHING!
> > >>
> > >> Dave Garfield - Colorado, USA
> > >>
> > >> From: Jill Saphic
> > >> To: oberheim@yahoogroups.com
> > >> Sent: Thursday, January 10, 2013 7:40 PM
> > >> Subject: [oberheim] WTB: Multiple Oberheims etc
> > >>
> > >> ...I agree with how nice the MOD paddles are on the Oberheims, but
> > >> that was the reason I let my Matrix-6s go, it started never landing back
> > >> in tune, and no one could come up with a replacement pot that would work
> > >> right so now I have wheels on everything except the Roland...
> > >
> > >
> > >
> > > --
> > > ** Loveslap Recordings
> > > ** updated website!! :
> > > ** http://www.loveslap.com
> > > ** like us on facebook:
> > > ** http://www.facebook.com/LoveslapRecordings
> > >
> >
>