Doepfer

> Greetings list,
>
> I'm having problems with my Doepfer A155 sequencer. I use it with the
> A154. My problem is in the A155 first CV sequence row. Only two steps
> of the eight actually produce voltages. I'm not sure why this is, as
> the second CV sequence works wonderfully.
>
> Anyone have any suggestions? I've contacted Doepfer through their
> hardware email address, but have yet to receive a response.

Yes, we had weekend :-)

It's difficult to make a diagnosis from the distance. First of all I'd take
a look at the connectors of the ribbon cables if they are firmly fixed to
the pin header on the pc boards. Maybe the upper board does not receive all
control signals (e.g. addresses) because of a loose connector. If this does
not help the module has to be repaired. Probably one of the multiplexers
(CD4051) is defective and has to be replaced. If you are a bit familiar you
could try to get an CD4051 and replace it by yourself (all integrated
circuits are equipped with sockets). Otherwise the module has to be sent in
for repair to the representative in your country.

Best wishes
Dieter Doepfer