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Re: [OM] Night shots-50/50 OM content

Subject: Re: [OM] Night shots-50/50 OM content
From: George Sears <gwsears@xxxxxxxxxxxxxx>
Date: Sun, 06 Sep 1998 21:11:25 -0400
At 09:31 AM 9/7/98 +1000, you wrote:
>
>
>
>George <qwsears@xxxxxxxxxxxxxx> wrote:
>
>> My OM4 does the exact same thing but with any lens. In low light
>> situations, the OM4 locks up tighter than Dicks hat band. If i wait long
>> enough, it will finally release...several minutes, but most of the time i
>> just do the reset thing and give up on the long exposure.
>> george2
>Hmm,
>
>I'd be worried about this.
>
>  My OM4 had this failure mode when it went belly up a couple
>of years ago. All auto OTF exposures (ie: non-spot) were
>overexposed by anything from half a stop or so at high speeds
>through to more than a stop at slower speeds. For exposures
>longer than a couple of seconds, the camera would 'lock up'
>(terminal over exposure).

Exactly the same 'lock up'

>
>  This happened after I had the camera in some high humidity;
>the self timer also packed it in with fast chirping rather than
>slow beeping.
>
>  I think that some moisture got into the gubbins of
>the camera and created a leakage path on the circuit board
>somewhere. I assume that the OTF system uses some
>sort of integrating circuit, and that for low light
>exposures the leakage became significant compared with the
>charging provided by the metering cell. At some point,
>they equal each other and the metering circuit measures zero light.
>
>  The fix, unfortunately,  was a complete circuit replacement.
>Has your OM4 been exposed to high humidity or moisture?

No excessive moisture other than the rather high Georgia humidity.


>It may be worth trying to dry it out in a warm oven (< 40C or so)
>for a couple of days (or a box of nitrogen if you've got access to that)
>
>
>
>     duncan
>

Thanks for all the help. I think the problem has been pinpointed.

geo2

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