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Re: [OM] Update on Om-2n problems

Subject: Re: [OM] Update on Om-2n problems
From: "Nicolas Goniak" <goniak@xxxxxxxxxxxxxxxx>
Date: Mon, 29 May 2000 11:52:04 +0200
It seems that OM-2's (either S, N or whatever) are quite sensitive to time.
I went this morning to a second-hand camera dealer shop in Paris, trying to
acquire an OM-2S ; this one, except the *really* bad looking case, had quite
the same symptom as Lyle's :
. in manual mode, the shutter seemed unable to get under 1/60s.

More interesting: disappointed, but still willing to get a semi-auto camera
body (I only have got a OM-1N), I chose to give a try to an OM-2N:
Still in manual mode, I set shutter speed to 1/60s, my venerable 35mm lens
to f/8, point lens towards a light bulb, trigger : OK... sounds like a
1/60th of a second... Now I put the cover upon the lens, trigger,
click.....click : it sounds *now* like a complete second.

Hope that all -2's have not been mistreated like these ones seem to have.

Nicolas Goniak.

----- Original Message -----
From: <HI100@xxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Cc: <lo@xxxxxxxx>
Sent: Monday, May 29, 2000 7:54 AM
Subject: Re: [OM] Update on Om-2n problems


> Lyle  (lo@xxxxxxxx)  asked:
>
> <<
>  I don't have the mirror lockup on auto--it fires ok--but I seem to have
the
> same shutter speed (1/60 I would estimate from the sound of it) on auto no
> matter what the aperture setting.  Would this similarly indicate either
photo
> diodes or switch as in the case of the  mirror lock-up? On manual works
ok,
> but these are different detectors aren't they?.  Are photodiodes still
> available, and is this a job a handy person could do, or is it off to the
> shop
> >>
>
> 1) Yes the detectors are quite different on manual.
>     But if the shutter speeds vary correctly when the shutter speed dial
is
> changed in manual this does indicate almost all the electronics for Auto
are
> working.
> 2) If one or both of the photo diodes were leaky or shorted it might well
> cause the shutter speeds to always be some fast value. Or if the circuit
> board were badly contaminated it might also cause similar symptoms. If all
> times are correct on manual then the rest of the parts ,amplifiers cct bds
> etc are all working correctly.
> 3) If the switch were defective or both diodes open circuit it would tend
to
> cause lockup since the normal LED exposure limiter would not work if the
> photo sensors do not work.
> 4) If the photo diodes are available it is still relatively difficult to
work
> on the boards as they require extreme cleanliness and they require use of
> silver alloy solder (metalized ceramic) and extreme static precautions as
the
> diodes connect to unprotected Mosfet transistors. If the photodiodes are
not
> available it should be possible to get suitable substitutes although
diodes
> with the right filtering ("blue enhanced" etc) are harder to get and some
> sort of crude lens may be necessary. It is probably necessary to
recalibrate
> auto mode with any new sensor.
>
> Regards,
>              Tim Hughes
>          >>Hi100@xxxxxxx<<
>
>
>
>
>
>
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