Doepfer

Thanks Dieter, i stock up on different types of fuses and will test those
during
next few weeks or so (also the ones you rcommended - 0.63A).
thanks for a detailed description.
cheers all
and happy holiday season
tomek


On 19/12/05, Dieter Doepfer <hardware@doepfer.de> wrote:
>
> The fuse values are recommended by the manufacturer of the transformer and
> we took them over without changes. We test all A-100 systems and frames
> that
> are manufactured in our company with the full load (i.e. 650mA for the old
> version of the power supply and 1200 mA for the PSU2). For empty frames we
> use dummy loads (high power resistors) to simulate the load. So far we
> never
> discovered a blown fuse during the final test (of course expect if there
> was
> a fault) with the specified values.
> As we have no "real" 115V mains voltage available in Germany we use a
> 230->115V transformer for testing the 115V systems and frames. Maybe the
> "real" 115V mains behaves a bit different, as the 230->115V transformer
> causes an additional delay until the full mains voltage is available.
>
> In any case one has to pay attention of the blow type. In any case the
> slow
> version (time lag) is necessary. Fuses with medium or fast response may
> blow
> during power on! If you are sure that you use a time lag/slow blow fuse
> with
> the right value  (500mA for 115V and PSU2) you may increase the value to
> the
> next step (630mA is the next common value here in Germany). This is OK as
> even a 630mA fuse will blow in case of e.g. a short circuit.
>
> In any case I have to warn against the usage of metal foils or other
> conductive materials to short the fuse. It is OK to use a fuse with the
> next
> higher value. But never short the fuse ! This is extremely dangerous and
> may
> cause fire or other damages.
>
> Best wishes
> Dieter Doepfer
>
> P.S. We have about 15 PSU1 left. When they are used up only the PSU2 will
> be
> manufactured.
>
>
>
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com
> > [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von tkrakowiak
> > Gesendet: Samstag, 17. Dezember 2005 22:03
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: Re: [Doepfer_a100] Re: fuse issue (Correction)
> >
> >
> > hello,
> >
> >  don't think it's shorting anywhere inside the suitcase (it's got
> > composite-plastic walls and aluminum railings which shouldn't affect
> even
> > when touched), but i'll check anyway. it seems to happen only when i'm
> > taking it somewhere (that's why i asked about moisture buildup) , when
> it
> > happened yesterday (2 fuses, 1 after another:) i only saw a blink
> > of led on
> > a119.
> >  soooo.... could i _safely_ try a different variety of fuses??
> > somewhat desperately looking for answers ( Dieter ?).
> > have a nice weekend all.
> > cheers
> > t
> >
> >
> >
> >
> > > I'm not sure if this is the problem you are having, but some Doepfer
> > > modules have PC boards *very* close to the edge of the module and it's
> > > possible that the power traces are shorting out against your case.
> > > This happened to me when I tried to install a certain Doepfer module
> > > (either the Quad ADSR or Triple Bandpass, I can't remember which) in
> an
> > > Asys RS15 euro-rack.... the traces on the lowest PC board touched
> > > against the case and shorted out the whole system. The worst part is
> > > that it fried 2 of my modules and I had to pay $180 to fix them.
> > > Now I don't know if the Doepfer cases are the exact same dimensions as
> > > the RS15, but you might want to check and see if any of your modules'
> > > PC boards can touch the case under rigorous patching conditions.
> > > Usually when a fuse keeps getting blown, there is an intermittent
> short
> > > in the electrical system... or you are getting really bad power spikes
> > > from your AC line. I assume you are using some sort of surge
> protector?
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>


[Non-text portions of this message have been removed]