Doepfer

Doepfer is his last name. Polite people will address him as Mr / Herr
Doepfer or with his first name Dieter if you're Anglo-Saxon / Scandinavian.
Just calling him 'Doepfer' is seriously rude.  

 

  _____  

Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] Im
Auftrag von Sidney
Gesendet: Donnerstag, 17. Februar 2011 01:10
An: Doepfer_a100@yahoogroups.com
Betreff: [Doepfer_a100] Re: Can't trigger A-140 from A-190-2

 

  

Doepfer, I successfully replaced the A-190-2 defective Q1 with a new BC547B
transistor. Now the gate is working. But I think that the CV V/V is not
working. I didn't test it before. Is there a way to fix it?

Thank you,

Sidney

--- In Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100%40yahoogroups.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
>





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