Re: Yamaha R3 losing stored channels

From: Mark D. Zacharias (mzacharias_at_yis.us)
Date: 06/20/04 

Date: Sun, 20 Jun 2004 17:27:48 -0500

Glad that worked out for you.

mz 

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"Rob Haughey" <peng001@hotmail.com> wrote in message
news:40D5FA38.7F8BF490@hotmail.com...
> I've now replaced the backup capacitor (super cap) and the unit is working
a treat.
> Thanks for your advice Mark,
> Rob
>
> "Mark D. Zacharias" wrote:
>
> > The backup capacitor is bad. It looks like a "button" and is near the
main
> > micro IC on the main board, if memory serves. Yamaha still stocks a
> > replacement.
> >
> > This model takes rather more effort to get  into than many receivers.
The
> > average DIY type or non-tech would likely have a problem with this one.
> >
> > Mark Z.
> >
> > --
> > Please reply only to Group. I regret this is necessary. Viruses and spam
> > have rendered my regular e-mail address useless.
> >
> > "Rob" <peng001@hotmail.com> wrote in message
> > news:40D0E48F.1E1468C6@hotmail.com...
> > > My Yamaha R3 receiver loses it's stored AM/FM channels when power
switch
> > is off for
> > > more than a few minutes.
> > > The power switch directly switches all mains power in the unit, i.e.,
> > there is no
> > > standby supply to any circuits.
> > > I cannot see any internal battery.
> > > I therefore think the problem is a faulty memory device LC7030 or a
faulty
> > > capacitor.
> > >
> > > Do they use caps (electro) for memory retention?
> > >
> > > The user manual states that the Receiver may lose it's stored channels
> > when
> > > *unplugged* for a long time.  As far as I can tell being switched off
is
> > equivalent
> > > to being unplugged.
> > >
> > > I would like to understand the circuit around this LC7030 device which
> > appears to be
> > > where the channels get stored.  Does anyone have a R3 circuit diagram
or
> > data***
> > > for Sanyo LC7030.
> > >
> > > Thanks for any advice.
> > >
>