Re: [OM] OM-2 battery short

[Tom Curlee]

John:

Is the main switch linkage connected to the cocking mechanism? I can remove 
the short from the bottom by pushing on part of the cocking linkage. Battery 
terminal resistance to ground is dependant on whether camera is cocked or 
not.  Also, with fresh batteries, the camera will fire normally for a very 
short time until the batteries are sucked down.
Can I rotate the lens mount/shutter ring assembly up and away from the 
camera body without removing the shutter string and electrical wiring?
Unless the main switch is somehow connected directly to the cocking linkages 
I still think I'll need to get futher into the camera body to find the 
short, which seems to be just under the lens mount flange.
Thanks, Tom


> From: "John Hermanson" <omtech@xxxxxxxxx>
> Reply-To: olympus@xxxxxxxxxxxxxxx
> To: <olympus@xxxxxxxxxxxxxxx>
> Subject: Re: [OM] OM-2 battery short
> Date: Tue, 6 Jul 1999 09:35:32 -0400
>
> Sounds like the main switch is shorted.
>
> John
> ----------------------------------------------------------------
> Camtech / Olympus Service since 1977
> 21 South La., Huntington NY 11743-4714
> 516-424-2121
> http://www.zuiko.com
> --------------------------------------------------------------
> ----- Original Message -----
> From: Tom Curlee <t_curlee@xxxxxxxxxxx>
> To: <olympus@xxxxxxxxxxxxxxx>
> Sent: Monday, July 05, 1999 7:51 PM
> Subject: [OM] OM-2 battery short
>
>
> > I recently picked up a clean OM-2 body super cheap.  It was sold 
> 'as-is',
> > i.e. wouldn't work.  Of course there weren't any batteries in it so I 
> was
> > hopeful.  I put in new batteries and it worked perfectly, but then
> wouldn't
> > work at all a few minutes later.  I pulled the batteries and found that
> > there was a .25 Amp load on the battery! Later I found that the load
> varies
> > between 2.5 to 5 Ohms across the battery terminals when the shutter is
> > cocked.
> >
> > I (don't listen, John H. :-)) pulled off the top and bottom covers and
> > poked, prodded, pulled, moved, etc., etc. (about 3 hours worth of etcs.)
> and
> > found that the short goes from around 150 Ohms when shutter is released 
> in
> B
> > to the 2.5 - 5 Ohms when shutter is cocked.  The heavy load starts when
> the
> > wind lever is just barely moved.
> >
> > The area causing the short appears to be to the right of the lens (when
> > looking at the lens from the front).  From the bottom, pushing a 
> vertical
> > linkage (part of the cocking mechanism)forward will cause the short to 
> go
> > away (well, to about 1 MOhm), pushing the other way it goes to full 
> load.
> I
> > suspect that I can get to the area causing the short if I can remove the
> > lens mount assembly, shutter ring and all.
> >
> > The question is, can I peel back the leatherette covering, remove the 4
> > mounting screws, and rotate the whole lens mount/shutter ring assembly 
> up
> > and out (still connected) without disconnecting the shutter string and
> > wiring?
> >
> > Any suggestions or info??
> >
> > Thanks, Tom
> >
> >
> >
> >
> >
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