Doepfer

yesterday it was still working but today when trying to feed audio through it it doesnt shift it, 
not up not down, nowhere, the audio goes throuht it and the level pot works but all else is 
dead, no shifting occurs.
Is this a common problem and something I can fix or is my frequency shifter totally screwed?

-Wille

> yesterday it was still working but today when trying to feed
> audio through it it doesnt shift it,
> not up not down, nowhere, the audio goes throuht it and the level
> pot works but all else is
> dead, no shifting occurs.
> Is this a common problem and something I can fix or is my
> frequency shifter totally screwed?
>
> -Wille

I think you will have to send in the module for repair. If the original
signal appears at the output without any shifting something is totally
wrong. Normally the original signal does not appear at the output. There is
no share of the original signal available at the output but only the signal
processed by the two analog multipliers which are fed by the sine/cosine
signals of the internal quadrature VCO. If the VCO would be dead there would
appear no audio signal at the output. From the distance I'd suppose a
defective multiplier (MC1496). An A-126 not connected to the A-100 bus would
behave a bit like what you described.

Did you change anything since yesterday (e.g. moving the module, any
modification e.g. connecting the A-143-9 quadrature LFO/VCO instead of the
internal VCO or anything else) ?

Best wishes
Dieter Doepfer

--- In Doepfer_a100@yahoogroups.com, <hardware@...> wrote:
>
> > yesterday it was still working but today when trying to feed
> > audio through it it doesnt shift it,
> > not up not down, nowhere, the audio goes throuht it and the level
> > pot works but all else is
> > dead, no shifting occurs.
> > Is this a common problem and something I can fix or is my
> > frequency shifter totally screwed?
> >
> > -Wille
> 
> I think you will have to send in the module for repair. If the original
> signal appears at the output without any shifting something is totally
> wrong. Normally the original signal does not appear at the output. There is
> no share of the original signal available at the output but only the signal
> processed by the two analog multipliers which are fed by the sine/cosine
> signals of the internal quadrature VCO. If the VCO would be dead there would
> appear no audio signal at the output. From the distance I'd suppose a
> defective multiplier (MC1496). An A-126 not connected to the A-100 bus would
> behave a bit like what you described.
> 
> Did you change anything since yesterday (e.g. moving the module, any
> modification e.g. connecting the A-143-9 quadrature LFO/VCO instead of the
> internal VCO or anything else) ?
> 
> Best wishes
> Dieter Doepfer


Thanks for the info, it was actually that it did not get  power, or it did get some cos the 
overdrive light lit up but I replaced the powercord with a newone and now it works like a 
charm, nice:)

i had this problem with 2 different 126´s yet and the new one that 
worked until 3 days ago start to have this problem as well.
i think it was not the power chord but when you removed the module from 
the chassis to verify the cable, you accidentaly "repaired" it.
there was a thread about this problem before, the member described it as 
"pushing the ic´s gently in their place" which helped me at the first 
time as well.

in my case the mixed, up and down outputs are very silent, almost mute
and the direct out (audio out) works as its supposed to.
but no shifting at the wet outs at all.