Doepfer

> -----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