Sounds to me like a problem with the MD switch in the body.
The MD switch is designed so that as the mirror goes up, one of the
contacts is grounded to immediately brake the winder's motor. If that
contact doesn't short to ground, the motor slows to a stop instead of
stopping immediately.
This is likely to show up at slower speeds. With the shutter open and the
winder continuing to turn, it will pull the first curtain back into the
frame (on OM-1's and 2's, there's nothing to prevent the camera from being
wound while the shutter is open). Then, after the exposure is "complete",
the second curtain is released, only it can only move as far as the first
curtain (this has to do with the double-roller design's gearing).
Fire the camera with the winder, shutter speeds at manual at 1/15th or so,
without a lens, and watch the mirror and curtains. The mirror should go up
and the curtains should travel, first, then second. Chances are, you'll
see the winder pull the first curtain back into the frame, then the closing
or second curtain will fly across to it. If so, the switch is your
problem.
Oh, and a missing MD cap will NOT cause a light leak.
Tom Murphy wrote:
> I have an OM2n which I recently purchased from a list member.
>
> I think there is a problem with the camera. I attached a Winder 2 to it
> and if the shutter speed is below 1/30 sec. the camera locks up. The
> mirror lifts, shutter opens but doesn't close and the mirror stays in
> the upright position. I have to use the wind on lever to fully cock the
> shutter and then use the Reset position on the Auto/Manual/Battery
> check to get the shutter to close and the mirror to drop back down.
> This happens whether the camera is set on automatic or manual. The
> camera seems to work ok when there is no winder attached i.e. it
> doesn't lock up but as the Winder cap is missing the film is in danger
> of getting fogged so a winder is necessary.
>
> Anyone got a simple, low cost solution? I have put in new Everready 357
> silver oxide batteries so I don't think batteries are the problem. The
> battery check lights up ok as well.
>
> Tom Murphy
>
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