Re: Russound 120v - 240v

["rb_ziggy" <richard.boreham@xxxxxxxxxxxx>]

Actually, I think my 'jumper terminology may have been misleading
here.  The 'jumper' is actually properly called (I believe) a PCB
Header connector.  They are 2 vertical pins attached to the PCB - a
plug then connects to these and takes the power to the transformer.
The 'spare' is a pair of vertical pins.  So the jumper is not a switch
in the sense they are used on computer motherboards as such but
appears to be an alternative power take off point from the PCB.

--- In ukha_d@xxxxxxx, Jim Noble <yahoo-groups@b...> wrote:
> rb_ziggy wrote:
>
> >
> > I know a few people use and have imported Russound equipment.
> >
> > I've just acquired a DPA-6.12 power amp which is internally
'factory
> > set' for 120v 60Hz operation.  I believe it may be possible to
easily
> > reconfigure to 240V 50Hz operation.  I've googled etc and
searched the
> > archive to no avail.
> >
> > Having a peek inside shows 2 torroidal transformers which are
> > currently each fed its own power supply from a circuit board
jumper
> > type plug marked CN115-1 (to xformer 1). Next to this jumper is
> > another (unconnected one) marked CN230-1.
> >
> > Does anyone know whether the 'factory setting' is simply a case
of
> > replugging to the alternative jumpers?
> >
> > (N.B. I take full responsibility etc if this blows up the
> > machine/fuses etc)
>
>
> At a guess the jumper re-arranges the transformers from parallel to
> series, such that they always have 110-120VAC across them.
>
> How many pins on the plug? If it's more than one, maybe the 230V
plug is
> connected differently internally to the 115V version.
>
> In theory, the 115v one should connect the "inner" ends of
the two
> primary coils to Live/Neutral, where as the 230v one would connect
them
> to each other. (The "outer" ends of the primary coil would
be
> permanently connected to Live/Neutral).
>
> ie:
>
> 115V (110V?):
> L  _____
>         3 _____
>         3&_____
> N  _____3
>
> L  _____
>         3 _____
>         3&_____
> N  _____3
>
>
> 230V (240V?):
> L  _____
>         3 _____
>         3&_____
>     ____3
>
>    ____
>         3 _____
>         3&_____
> N  _____3
>
> I could be very very wrong though, and the secondary coils may be in
> parallel as well.
>
> Jim