Doepfer

It reminds me how i burnt my MCV-4 applying reverse current to Gate out. (tried to use standard Gate mode with S-Trig synth)

--- In Doepfer_a100@yahoogroups.com, <yahoo@...> wrote:
>
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com
> > [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von Aris
> > Gesendet: Sonntag, 29. Juli 2012 08:10
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: [Doepfer_a100] Problem with A-190-2 Midi-to-CV/Gate...
> >
> >
> > I've had this module about 2 months, and it's been working fine
> > until today. When I press a key on my midi keyboard controller,
> > the LED lights up, and the CV pitch changes....but there is a
> > consistent ~5V at the gate jack. It doesn't drop to zero when I
> > release the key....it stays consistent at around 5V. All other
> > jacks are working normally when the appropriate midi controller
> > function is activated.
> >
> > Anything I can do for a DIY repair? Thanks for your help
> 
> Probably the gate transistor is defective. This may happen if the A-190-2 or
> even another module on the same bus is installed in the wrong. The problem
> should be solved by replacing the transistor (BC547) behind the learn
> button. Any npn transistor with the same pin-out as the BC547 should work.
> 
> We are about to change the design of the A-190-1/2/3 because this happened
> several times in the past because of reverse installed modules.
> 
> Best wishes
> Dieter Doepfer
>