Doepfer

my a126 freq shifter suddenly stopped doing his job.
the audio output still works at normal level but the 3 shifted outs (up, 
down and mixed) are very silent
and there is no effect to be heard anymore.
the overload starts clipping at 3 already - input is an osc sawtooth 
directly.
when the mix poti is in middle setting - the signal is almost mute, 
extreme left and extreme right does give
a very silent signal.

anybody has an idea what could be the problem ?

the frequency shifter's carrier vco is dead...?

best regards,
Bakis.


--- dab <trafo-dab@gmx.de> wrote:

> my a126 freq shifter suddenly stopped doing his job.
> the audio output still works at normal level but the
> 3 shifted outs (up, 
> down and mixed) are very silent
> and there is no effect to be heard anymore.
> the overload starts clipping at 3 already - input is
> an osc sawtooth 
> directly.
> when the mix poti is in middle setting - the signal
> is almost mute, 
> extreme left and extreme right does give
> a very silent signal.
> 
> anybody has an idea what could be the problem ?
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
> 
> 


Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
[Doepfer_a100] group owner
http://www.parallel-worlds-music.com
http://www.myspace.com/parallelworldsmusic
http://www.myspace.com/interconnectedmusic
http://www.myspace.com/memorygeist
http://www.DiN.org.uk
http://www.musicamaximamagnetica.com
http://www.shimarecords.co.uk
http://www.rubber.gr
Athens-Greece


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Check that the two 'jumpers' at ST3 and ST4 are in still in place - 
these connect the internal oscillator to the rest of the shifting 
circuit. The location of these two are shown in this document, as it is 
where you can connect an external oscillator up, such as the A-143-9:

http://www.doepfer.de/a100_man/A126_A143_9_connection.pdf

Also check that the socketed ICs are firmly seated, by gently pushing 
on them, particularly the PA382/CEM3382, as this *is* the oscillator.

Tim


--- In Doepfer_a100@yahoogroups.com, dab <trafo-dab@...> wrote:
>
> my a126 freq shifter suddenly stopped doing his job.
> the audio output still works at normal level but the 3 shifted outs 
(up, 

> down and mixed) are very silent
> and there is no effect to be heard anymore.
> the overload starts clipping at 3 already - input is an osc sawtooth 
> directly.
> when the mix poti is in middle setting - the signal is almost mute, 
> extreme left and extreme right does give
> a very silent signal.
> 
> anybody has an idea what could be the problem ?
>

hello tim


thx for the reply, it just stopped working again but this time i can 
push it
as gently as a man can be - no luck anymore.
i guess i have to send it back to doepfer for repair.






Tim Stinchcombe schrieb:
>
> Check that the two 'jumpers' at ST3 and ST4 are in still in place -
> these connect the internal oscillator to the rest of the shifting
> circuit. The location of these two are shown in this document, as it is
> where you can connect an external oscillator up, such as the A-143-9:
>
> http://www.doepfer.de/a100_man/A126_A143_9_connection.pdf 
> <http://www.doepfer.de/a100_man/A126_A143_9_connection.pdf>
>
> Also check that the socketed ICs are firmly seated, by gently pushing
> on them, particularly the PA382/CEM3382, as this *is* the oscillator.
>
> Tim
>
> --- In Doepfer_a100@yahoogroups.com 
> <mailto:Doepfer_a100%40yahoogroups.com>, dab <trafo-dab@...> wrote:
> >
> > my a126 freq shifter suddenly stopped doing his job.
> > the audio output still works at normal level but the 3 shifted outs
> (up,
> > down and mixed) are very silent
> > and there is no effect to be heard anymore.
> > the overload starts clipping at 3 already - input is an osc sawtooth
> > directly.
> > when the mix poti is in middle setting - the signal is almost mute,
> > extreme left and extreme right does give
> > a very silent signal.
> >
> > anybody has an idea what could be the problem ?
> >
>
> 
>
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[Non-text portions of this message have been removed]

> my a126 freq shifter suddenly stopped doing his job.
> the audio output still works at normal level but the 3 shifted outs (up,
> down and mixed) are very silent
> and there is no effect to be heard anymore.
> the overload starts clipping at 3 already - input is an osc sawtooth
> directly.
> when the mix poti is in middle setting - the signal is almost mute,
> extreme left and extreme right does give
> a very silent signal.
>
> anybody has an idea what could be the problem ?

Sounds like a defective quadrature oscillator. You will probably have to
send in the module for repair to the dealer where you purchased the module.

Best wishes
Dieter Doepfer