Doepfer

Mr. Doepfer. I successfully changed the A-190-2 Q1 resistor by replacing it with a BC547B transistor and the gate output is now working. But I think that the CV V/V output is not working. Is there any piece I can replace to fix this?

Thank you,

Sidney

--- In Doepfer_a100@yahoogroups.com, <yahoo@...> wrote:
>
> > I think I had plugged the A190-2 the wrong way the first time I
> > plugged it into the power bus board, and might damaged the unit.
> > It seemed to be working fine, as it was receiving midi messages
> > and activating the A110 both from the CV1 and pitch bend from
> > CV2. But the gate output problem and out of tune scale indicated
> > there is something wrong really. Maybe I will be necessary to buy
> > a new one.
> >
> > Thank you for the kind attention.
> >
> > Sidney.
> 
> If the A-190-2 was plugged in the wrong way the gate output is fried. In
> this case the collector of the npn gate output transistor is connected
> to -12V which destroys the transistor. This explains why the gate output
> does not work anymore. It is difficult to say if other sections of the
> module are defective too. You may try to replace the transistor (Q1, BC547C)
> to see if this is the only defective part. Or you send in the module for
> repair to the dealer where you purchased the device.
> 
> Best wishes
> Dieter Doepfer
>