Re: Yamaha R3 losing stored channels

From: Mark D. Zacharias (mzacharias_at_yis.us)
Date: 06/17/04 

Date: Thu, 17 Jun 2004 04:44:29 -0500

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. 

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"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.
>
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