Crumar Musical Instruments User Group.

Thanks to Peter Ullrich for the schemes.
My problem is that I have 5 voices. One does not work, concretely third.
In the mode Split I can touch 2 but not 3 notes simultaneously. The 
mode Upper is perfect.
Can somebody help me?

Pardon by ingles I am Spanish and I translate from a translator.
Thanks

--- In crumar@yahoogroups.com, "gustavetees" <gustavetees@...> wrote:
>
> Thanks to Peter Ullrich for the schemes.
> My problem is that I have 5 voices. One does not work, concretely third.
> In the mode Split I can touch 2 but not 3 notes simultaneously. The 
> mode Upper is perfect.
> Can somebody help me?
> 
> Pardon by ingles I am Spanish and I translate from a translator.
> Thanks
>
Trace signal around Filter.  Most likely it's the analog filter that
has failed.  If signal is getting in but not out then almost assuredly
since all control is digital. However I'm dealing with a chroma
polaris currently that has osc1 out on an assigned
voice..however..ahem...it doesn't appear to be analog in nature. ...!
 I'm still trying to figure out how this is possible.  but the effect
moves from channel to channel depending on the assigner's perspective
:).  It also has lost the entire switch panel suddenly.  As in 30 or
so switches near simultaaneously stopped working.  You will all say
'not so!'..however...I've confirmed it.  They always worked before. 
The functions still work if you short the appropriate wires. The
ribbon cables are flawless down to the panel membrane switch pad. 
However...each..individual switch appears...to have ceased to
conduct..all at once.  ARE WE IN A VORTEX OR SOMETHING!  Sheesh..what
a weird week! -Bob

Did you try to exchange the 3rd and 4th cem3328 with one another? If the problem then 
moves to the 4th voice, get another 3328
 

--- In crumar@yahoogroups.com, "Robert Weigel" <sounddoctorin@...> wrote:

>
> --- In crumar@yahoogroups.com, "gustavetees" <gustavetees@> wrote:
> >
> > Thanks to Peter Ullrich for the schemes.
> > My problem is that I have 5 voices. One does not work, concretely third.
> > In the mode Split I can touch 2 but not 3 notes simultaneously. The 
> > mode Upper is perfect.
> > Can somebody help me?
> > 
> > Pardon by ingles I am Spanish and I translate from a translator.
> > Thanks
> >
> Trace signal around Filter.  Most likely it's the analog filter that
> has failed.  If signal is getting in but not out then almost assuredly
> since all control is digital. However I'm dealing with a chroma
> polaris currently that has osc1 out on an assigned
> voice..however..ahem...it doesn't appear to be analog in nature. ...!
>  I'm still trying to figure out how this is possible.  but the effect
> moves from channel to channel depending on the assigner's perspective
> :).  It also has lost the entire switch panel suddenly.  As in 30 or
> so switches near simultaaneously stopped working.  You will all say
> 'not so!'..however...I've confirmed it.  They always worked before. 
> The functions still work if you short the appropriate wires. The
> ribbon cables are flawless down to the panel membrane switch pad. 
> However...each..individual switch appears...to have ceased to
> conduct..all at once.  ARE WE IN A VORTEX OR SOMETHING!  Sheesh..what
> a weird week! -Bob
>

Do you have the filter diagram? I can send that if you can't find it
but it's online.  I need to link all those on my site.  But anyway
lots of work :-).  But you need to trace to see if signal is getting
to the filter.  If it is is it getting out?  If it's not and it's not
the filter then it's because the cutoff is held low or something. 
Here's a few pins that might help on the cem3328.

Pin 2 freq control
pin 5 + sig in
pin 6 - sig in
pin 9 output

From those you should be able to at least figure out which side of
things the problem is on.    Possibly there's just a bad connection or
something shorting something before the signal in.  Most likely
failure would be a summing amp I'd think on that side of things as
probably they use an analog amp to sum the waveshaped saw signal and
pulse/square signal.  Or it could be on that one that they generate
the signals added in software.  I suspect it's the other though.

I was playing my bit one a bit tonight :-).  It does have some special
sounds.  Very nice sounding attacks for a digital oscillator machine.
 THe AX80 is fairly harsh/sterile in that aspect.  The bit one is much
more natural sounding there. -Bob
--- In crumar@yahoogroups.com, "Gustavetees" <gustavetees@...> wrote:
>
> thanks for the answers. The filters (cm3328) work well. That is not
the problem.  I have changed them but the problem is the same one. 
> the third voice does not sound. I am not engineer and that not to be
made more. 
> to somebody is happened to him something?
> 
> Thanks
> 
> 
> ---- Original Message ----- 
>   From: monodist 
>   To: crumar@yahoogroups.com 
>   Sent: Friday, February 09, 2007 9:49 AM
>   Subject: [crumar] Re: Problems with crumar bit01
> 
> 
>   Did you try to exchange the 3rd and 4th cem3328 with one another?
If the problem then 
>   moves to the 4th voice, get another 3328
> 
> 
>   --- In crumar@yahoogroups.com, "Robert Weigel" <sounddoctorin@> wrote:
>   >
>   > --- In crumar@yahoogroups.com, "gustavetees" <gustavetees@> wrote:
>   > >
>   > > Thanks to Peter Ullrich for the schemes.
>   > > My problem is that I have 5 voices. One does not work,
concretely third.
>   > > In the mode Split I can touch 2 but not 3 notes
simultaneously. The 
>   > > mode Upper is perfect.
>   > > Can somebody help me?
>   > > 
>   > > Pardon by ingles I am Spanish and I translate from a translator.
>   > > Thanks
>   > >
>   > Trace signal around Filter. Most likely it's the analog filter that
>   > has failed. If signal is getting in but not out then almost
assuredly
>   > since all control is digital. However I'm dealing with a chroma
>   > polaris currently that has osc1 out on an assigned
>   > voice..however..ahem...it doesn't appear to be analog in nature.
...!
>   > I'm still trying to figure out how this is possible. but the effect
>   > moves from channel to channel depending on the assigner's
perspective

>   > :). It also has lost the entire switch panel suddenly. As in 30 or
>   > so switches near simultaaneously stopped working. You will all say
>   > 'not so!'..however...I've confirmed it. They always worked before. 
>   > The functions still work if you short the appropriate wires. The
>   > ribbon cables are flawless down to the panel membrane switch pad. 
>   > However...each..individual switch appears...to have ceased to
>   > conduct..all at once. ARE WE IN A VORTEX OR SOMETHING! Sheesh..what
>   > a weird week! -Bob
>   >
>

I reviewed my own comments on the synth.  I had glanced at the
diagrams but never entered the chips of interest for some reason.  got
that updated.  The 13700 is your likely culprit I'd think if it's not
the filter.  But do the check I suggested to see where the signal
stops.  -Bob