The original set may have a thermal fuse in an aluminum heat sink. If you
buy the 6V lithium battery (2 -3Vs strapped together) and take the plastic
case off, you'll find that it is 2- 3V cells strapped together (and the link
between the 2 cells is also a fuse).
_________________________________
John Hermanson
Camtech, Olympus OM Service since 1977
631-424-2121 www.zuiko.com
Call Olympus for FREE manuals!
1-800-221-3000
_________________________________
----- Original Message -----
From: <ClassicVW@xxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Sunday, December 16, 2001 11:39 PM
Subject: Re: [OM] Replacing lithium cells; Soldering delicate circuitry
> Ok, thanks for the info, Joe. I have both a soldering gun, and an iron
which
> is supposed to be for these electronics. The cells do look like regular 3V
> lithiums in size, so that's what I'll be getting.
>
> George S.
>
>
> > It ought to work, if the lithium batteries will fit physically, without
> > stray electrical contacts being made. The batteries used are probably a
> > standard size (like 2/3 of an "A" cell?). Try looking at the Eveready
> > website <http://www.energizer.com> under the Technical Information
button.
> > (It seems to require Internet Explorer. When I use Netscape, the site
> > crashes my computer.)
> >
> >
> > However, it's a common myth that one uses low heat for delicate things.
> > You should instead use a very hot iron, and get the job done as quickly
as
> > possible.
> >
> > The extreme case is soldering magnet wire to terminal pins moulded into
> > nylon coil forms -- if you don't use an 800-degree iron, the bobbin will
> > melt as you slowly heat the terminal pin. Been there, done that.
> >
> > I use an ancient Weller TCP-1 temperature-controlled soldering iron.
One
> > sets the temperature by using the correct tip. No electronics are
> > involved. I bought one after working at RCA in the mid 1960s, and
seeing
> > them used on the production line. This iron is now the basic unit in
> > Weller's TCP line.
> >
> > 600-degree tips are used for eutectic (37-63) solder
> >
> > 700-degree tips are used for ordinary (40-60) solder
> >
> > 800-degree tips are used for magnet wire (where one burns the insulating
> > varnish off and solders all at once). I use 800-degree tips to solder
> > delicate things. This hot tip gets the solder terminal up to temperature
as
> > fast as possible, reducing the amount of collateral heating, which is
the
> > key issue.
> >
> > A soldering *gun* may be hard on semiconductor eletronics, as the tip is
> > heated by passing a very large current through the tip, and this can
induce
> > large currents in unexpected places. Also, an iron solders more quickly
> > because the tip is already at temperature, and so its stored heat is
> > instantly available.
> >
> > Joe
> >
>
>
>
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