SV: Re: SV: [sdiy] Matrix 6R filter problem

[karl dalen]

A good idea would then be to solder them in!
I did that with my M6R once upona time.
A light knock on the unit could make the IC pop out of  the holder.


KD

--- jays at aracnet.com skrev:

> All the M6Rs and Matrix12 and Xpanders I have all have sockets. It has been a
> big problem for me. I had a M6 once which the uC fell out of the socket and
> was rattling around inside the unit.
> 
> I would reseat the one chip that is on the bad voice and then re-cal before I
> did anything else. If that didn't fix it then I would swap chips and see if
> the problem moves. Always re-cal before testing too. Another thing is be
> careful of the sockets. They use cheap sockets and I've pulled the pins out
> of them when swapping chips.
> 
> These units are getting to the point (age wise) where replacing the caps
> (electros and tantilums (sp?)) wouldn't be bad either. I haven't used my M12
> in a while since it has gotten noisy from bad caps and the legend overlay has
> shrunk to the point there the keys are rubbing and sticking.
> 
> Jay S.
> 
> karl dalen wrote:
> 
> > If the filter cuts in 24 db but are only upp a bit in freq check the
> > filter capps (4 of them)and  check the DAC CV at VCF CV pin input.
> > If these are OK then something are wrong with the IC!
> > 
> > 130 are great price!
> > 
> > REG
> > KD
> >  
> > --- rkmoore at memphis.edu skrev:
> > 
> > > Hi everyone,
> > > 
> > > Today I got my hands on a Matrix 6R (for $130!) that seems to be in good
> > > order, except one voice has a problem.  The filter sounds like it has a
> > > higher cutoff and resonance setting than the other voices on most
> > > patches.  I have briefly combed the internet and learned that this synth
> > > uses the CEM3396 osc/filter IC (any left Paul?).  The voice DOES play,
> > > and the oscillator sounds fine, but the filter sounds wider open than
> > > the others.  I tried the 'calibrate' command, but didn't notice a
> > > difference afterwards.  Has anyone dealt with an M6R in similar shape? 
> > > Also, is it possible to simply de-assign the bad voice and use the other
> > > 5?  I haven't had the machine open yet, so I haven't tried moving IC's
> > > around to see if the problem moves (hope they're socketed!).  Any
> > > responses will be appreciated.  I've got a 48 hour return period from
> > > the store.
> > > 
> > > Thanks,
> > > 
> > > Richard Moore
> > > 
> > > 
> 
>