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Re: [OM] OM-2n shutter speeds - retest

Subject: Re: [OM] OM-2n shutter speeds - retest
From: John Hermanson <omtech@xxxxxxxxx>
Date: Thu, 21 Jan 1999 13:01:52 -0500
It's not the auto/manual switch under the top cover.  THAT switch only
controls the meter movement.  The other A/M switch is on the main
circuit board under the mirror box floor.

John

MR THOMAS N CURLEE wrote:
> 
> John:
> 
> I'm fairly sure it's not the auto/manual switch.  That was my first
> thought so I removed the top cover and used a cotton swab and contact
> cleaner to carefully clean/lubricate the switch.  Also, the camera
> looks very clean, with the switch moving cleanly without any obvious
> 'goo'.  I find it interesting that I can clear the problem every time
> by simply removing the lens cap and pointing the lens at a light bulb.
>   It acts like some part of the camera circuitry needs a node to be
> charged or discharged, which the internal photocells are doing when
> exposed to bright light.  I've seen similar problems when parts were
> left out of a prototype breadboard.  Whatever is causing the problem
> is not a 'hard' failure but something that can be changed by the
> light current of the photo diodes.
> 
> Could a bad or leaky switch cause the interaction of modes?
> 
> Tom
> 
>

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