I got my OM4 to display almost exactly the same symptoms you describe - by
removing the lens.
Have you checked the spot metering reset button, the little black button
inset in the face of the lens mount flange? Does this switch look intact
and sit proud of the flange when a lens is removed? If not, it might be
the problem. Try pushing it in with something and see if the spot meter
then works. Perhaps the switch is intact and the contacts inside are
corroded or some such.
This switch can be sheared off by some third party lenses which have four
screws securing the mount, instead of three, as on Zuikos.
Giles
PaulThBrit@xxxxxxx wrote:
> OK, some would say I'm crazy to think about repairing my beloved OM-4, but I
> have had good luck with similar repairs, have access to clean rooms/laminar
> flow benches and circuit repair/surface mount gear. I really do not want to
> spend ~$200 getting this repaired professionally.
>
> My guess is that it is a loose connector, broken circuit trace or cold solder
> joint. The symptoms are as follows and have existed for over five years:
> - Camera operates perfectly normally with the exception of the spot meter
> modes, memory store (LED light doesn't flash), and the metering system does
> not turn on when the shutter release is depressed lightly like it should.
>
> - The meter system does turn on and work (with the exception of spot
> metering) if the Auto/Manual switch is turned to the 'Battery Check' position
> and then back to 'Auto' or 'Manual'.
>
> - The self timer works, as does the flash.
>
> All the symptoms seem to me to point to something near the shutter release
> button. My question is, are there step by step instructions on available as
> to how to remove the top plate to gain access to this area? Do the symptoms
> point to anything other than a bad joint or connection? Is this a 'normal'
> failure mode of the OM-4? Are there any other symptoms I can provide to help
> diagnose the problem?
>
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