Re: Re: anything new in the vr-5000 clock battery backup by no...

As I recall, the analysis of the clock circuit showed that it is quite power
hungry, so the only real solution would be a re-design, a task not for the
faint of heart.

lh

On Tue, Sep 7, 2010 at 6:07 PM, elkmoose55 <[email protected]> wrote:

>
>
> Maybe one could disconnect that battery and see if the contents get lost,of
> course if you have a backup from that computer program or if you dont have
> that much in there,let us know!I'll see what I can do to make a test also,so
> if this is just a buffer,then we should be able to find out what part of
> that control ic can be set up with a backup battery,i am studyin the
> schematic as best as I can
>
>
> --- In [email protected] <YaesuVR-5000%40yahoogroups.com>,
> poldhu1901@... wrote:
> >
> >
> > In a message dated 05/09/2010 23:52:36 GMT Daylight Time,
> > martin_cook@... writes:
> >
> > Hi there - I see on the schematic for the control unit there is a 7.2volt
>
> > nicad at the lower left side drawn in in dotted lines as though it's an
> > option. I have replaced similar backup batteries with 'supercaps' in the
> past
> > and they work quite well, keeping the memories alive in my NRD515
> receiver
> > for more than a fortnight.
> >
> >
> > ----------------
> > Hi Martin
> >
> > I think the problem referred to is that of the VR-5000 losing its clock
> > data if disconnected from the mains, the memorised frequencies seem to be
>
> > stored in non-volatile devices so shouldn't be an issue.
> >
> > I wasn't previously aware of the 7.2v Ni-Cad but online comments suggest
> > it's fitted to act as a supply buffer, to deal with problems of the CPU
> > resetting itself with supply glitches, rather than for data retention.
> >
> > regards
> >
> > Nigel
> > GM8PZR
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>  
>


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



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