Try the mechanical needle centering at asa 100 as Mark D. suggested.
That'll atleast indicate if the mechanics and pulleys of the meter are in
the right place. Then tighten the ground screw as previously described by
Clint. An ohm reading from the blue wire through the meter casing should be
about 1450 ohm. If the reading is infinite, then meter winding is "open",
that is , meter would have to be replaced.
_________________________________
John Hermanson www.zuiko.com
Camtech, Olympus Sales & Service since 1977
New OM & Used, Digital, Pearlcorders, Binoculars
21 South Lane, Huntington NY 11743-4714
631-424-2121
_________________________________
----- Original Message -----
From: <T.Clausen@xxxxxxxxxxxx>
To: "Zuikoholics Anonymous" <olympus@xxxxxxxxxxxxxxx>
Sent: Sunday, March 03, 2002 8:04 PM
Subject: Re: [OM] OM1 meter problems?
On Sun, 3 Mar 2002, Mark Dapoz wrote:
> On Mon, 4 Mar 2002 T.Clausen@xxxxxxxxxxxx wrote:
>
> > I tried to pop off the top and see if I could adjust my way out of it
(the
> > adjustments available through the "eccentric" on the top of the
> > galvanometer). However this was (as I'd almost expected) not possible -
> > the meter is far too much off.
>
> You didn't by any chance remove the lens mount did you? On later model
OM-1's
> (and all OM-1n's) that will cause the meter string tension to be lost.
I know - and I didn't remove the lens-mount. While it might be
interresting, it would also be a challenge that I'm not up for at this
moment.....
> You
> can check it by setting the camera to 100 asa, speed to B, 50/1.8 mounted
and
> set to f1.8. The needle should roughly center (within a stop or two). If
it
> doesn't, that's your problem.
It does center (and did also before I started to mess with it), quite
accurately in the middle of the meter.
>
> > I am suspecting that it might be the cds-cells that are non-functioning,
> > but there might be other, more probable, things I've overlooked. Anyone
> > with a hint to share?
>
> It's possible, but not likely, the CDS cells hardly ever die.
Was also what I would guess....
> Check all the mechanical items first.
As far as I can see, the mechanical stuff is functioning. The needle
centers in the meter under the conditons you described above, and the
needle moves freely when I manipulate the ASA-dial and/or shutter/apeture
rings. Any more tests I could perform?
--
-------------------------------------------
Thomas Heide Clausen
Civilingeniør i Datateknik (cand.polyt)
M.Sc in Computer Engineering
E-Mail: T.Clausen@xxxxxxxxxxxx
WWW: http://www.cs.auc.dk/~voop
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