here is a link to an OM-4 manual:
On page A-41 it states: to use without batteries, rotate shutter ring to
"60" while pressing the "B lock" button. That may unlock the mirror.
On Wed, Oct 11, 2017 at 9:56 AM, Bill Barber via olympus <
> My OM 4 (new circuit) has been sitting a while with no batteries.
> Yesterday, I was trying to search out the bodies that had 2 screens into
> which I had John scribe grid lines. The mirror in the OM4 was in the up
> position (apparently I must have released the shutter without batteries at
> some time in the past.) No problem. Upon insertion of new batteries, I
> heard a few little electrical sounds, as is not uncommon and nothing
> happened. Can't cock the shutter, can't release the shutter, can't do a
> battery check and mirror remains up. Question 1- What the heck is going on?
> No batteries, why would anything occur that would screw up the circuit?
> Thought maybe it was bumpers becoming stick so gently nudged the mirror
> down a little and it moved freely (not stuck.) I'm I missing something
> obvious? Question 2-assuming the body is toast or semi-toast, is there a
> way for me to get the mirror down, see the focusing screen (or remove it)
> without making things worse? My feeling is that there is
> some simple that just hasn't presented itself to me, yet. Oh, for
> inquiring minds, I am still doing a good bit of film capture. Bill
> "Scratching His Head" Barber
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