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From: David Nebenzahl on 23 Apr 2010 14:12
On 4/21/2010 12:18 PM David Nebenzahl spake thus:

> Question is about a Kyocera R-851 receiver, ca. 1985, 85 w./channel.
> Unit is in fine condition (many capacitators have been replaced) except
> for one thing: it doesn't remember radio stations.
>
> This receiver has 7 "presets" each for AM and FM. These can be set, and
> the unit will remember them so long as the power is on. Leave it
> overnight and the settings are gone.
>
> I'm ASSuming that these are stored in memory that may have battery
> backing. Opening the unit reveals no such battery/cell.

But of course, as readers of this thread know, further investigation did
in fact reveal a battery (3-volt Li cell).

Clipped off the old cell (it was attached to the board with little
spot-welded-on "legs"). Found a very similar cell in my battery
collection (flat 3-volt Li large "hearing-aid" style cell). Soldered a
couple wires to it, soldered it to old battery connections, wrapped it
with electrical tape and tucked it into a slot behind the front panel.
The receiver now remembers all presets.

By the way, wasn't there a thread here recently about the difficulties
of soldering connections to such batteries/cells? I had no problem at
all; I cleaned up spots using fine sandpaper (320-400 grit silicon
carbide), then used my old non-lead-free solder and a clean tip on my
iron. Connection was bright and solid.


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)
From: William Sommerwerck on 23 Apr 2010 15:08
It's interesting how many expensive products (and I'm including devices that
sell or sold for over $1000) use soldered-in backup cells, rather than a
battery holder. The battery in a product that gets regular use will often
last long behind its nominal life (10 or 15 years, versus 5), but that's
still no excuse. Indeed, one of the advantages of using a socket is that you
can replace the cell /while the unit is operating/.

My hall synthesizers use a lithium coin cell for backup, and I've replaced
their soldered-in cells with sockets.


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