Doepfer

> -----Ursprungliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von karlsjunkmail
> Gesendet: Dienstag, 10. Juli 2012 08:49
> An: Doepfer_a100@yahoogroups.com
> Betreff: [Doepfer_a100] A-110 tuning question
>
>
> Hey there Doepfer group members,
>
> I have another newbie question. I purchased a basic A-100 modular system
> used a few months ago, and I'm still having some trouble figuring it
> out. Part of the problem is the tuning of the two A-110 VCOs. I
> understand that I need to give the system at least 20 to 30 minutes to
> warm up, but even then, the tuning is off. If I hook up the system so
> that I can hear VCO 1 and/or VCO 2 when I press keys on my MIDI
> controller, VCO 1 cannot tune to the correct pitch because it is not in
> range of the tuning knob. More puzzling to me is VCO 2, which seems to
> produce a slightly different random note each time I press a key. (In
> regard to the issue with VCO 2, is there something else that could  be
> causing this random-pitch effect? I have made only the connections
> necessary for a simple synthesizer sound. When I "sync" VCO 2 to an
> output of  VCO 1, this effect generally seems to go away. Please forgive
> me if this is an  obvious problem.)
>
> I've tried to investigate some previous discussion threads, and I see
> that several other users have had the same problem I have with VCO 1,
> and the suggested solution is to follow the "adjustment procedures" on
> this webpage: http://www.doepfer.de/a110_tec.htm. However, since I don't
> even have a rudimentary understanding of electronics repair, I have no
> idea what the adjustment procedures are talking about. To give you an
> idea of how clueless I am, I don't even know how I would go about
> "measuring the voltage" of the various components, nor do I know how to
> read the schematics. I suppose I could possibly take the modules and the
> instructions to a professional repair person, but clearly, repairing the
> VCOs is not a job I can do myself.
>
> I guess at this point, since I am unable and frankly unqualified to make
> the sort of electrical adjustments that appear to be necessary to get my
> VCOs in tune, I'm wondering if I could fix the problem simply by buying
> two brand-new VCOs. Would they ship from the factory with correct tuning
> and function properly once installed? (If so, I'd be happy to part with
> my current A-110s, which I'm sure could be calibrated by someone who
> knows what he or she is doing.)
>
> Thanks so much for your help!
> Karl
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

>
> Hello Karl,
> 
> in this case I'd recommend to send in the module for calibration as without
> measuring a voltage it's impossible to do the adjustments. The procedure
> depends upon your home country. If you live within the EU you may send in
> the module directly to us (address on our website). Otherwise please contact
> the Doepfer representative in your country and ask if they are able to help
> you.
> 
> Best wishes
> Dieter Doepfer
> 
> 
> > -----Ursprungliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com
> > [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von karlsjunkmail
> > Gesendet: Dienstag, 10. Juli 2012 08:49
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: [Doepfer_a100] A-110 tuning question
> >
> >
> > Hey there Doepfer group members,
> >
> > I have another newbie question. I purchased a basic A-100 modular system
> > used a few months ago, and I'm still having some trouble figuring it
> > out. Part of the problem is the tuning of the two A-110 VCOs. I
> > understand that I need to give the system at least 20 to 30 minutes to
> > warm up, but even then, the tuning is off. If I hook up the system so
> > that I can hear VCO 1 and/or VCO 2 when I press keys on my MIDI
> > controller, VCO 1 cannot tune to the correct pitch because it is not in
> > range of the tuning knob. More puzzling to me is VCO 2, which seems to
> > produce a slightly different random note each time I press a key. (In
> > regard to the issue with VCO 2, is there something else that could  be
> > causing this random-pitch effect? I have made only the connections
> > necessary for a simple synthesizer sound. When I "sync" VCO 2 to an
> > output of  VCO 1, this effect generally seems to go away. Please forgive
> > me if this is an  obvious problem.)
> >
> > I've tried to investigate some previous discussion threads, and I see
> > that several other users have had the same problem I have with VCO 1,
> > and the suggested solution is to follow the "adjustment procedures" on
> > this webpage: http://www.doepfer.de/a110_tec.htm. However, since I don't
> > even have a rudimentary understanding of electronics repair, I have no
> > idea what the adjustment procedures are talking about. To give you an
> > idea of how clueless I am, I don't even know how I would go about
> > "measuring the voltage" of the various components, nor do I know how to
> > read the schematics. I suppose I could possibly take the modules and the
> > instructions to a professional repair person, but clearly, repairing the
> > VCOs is not a job I can do myself.
> >
> > I guess at this point, since I am unable and frankly unqualified to make
> > the sort of electrical adjustments that appear to be necessary to get my
> > VCOs in tune, I'm wondering if I could fix the problem simply by buying
> > two brand-new VCOs. Would they ship from the factory with correct tuning
> > and function properly once installed? (If so, I'd be happy to part with
> > my current A-110s, which I'm sure could be calibrated by someone who
> > knows what he or she is doing.)
> >
> > Thanks so much for your help!
> > Karl
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>