I bought an Olympus OM4 with a jammed film advance and shutter. The metering
and battery check still worked, but the camera shutter and film are advanced
and jammed, and the camera won't fire at B or 1/60 sec, the manual speeds.
Searching the web, this seems to be a common flaw in the OM4.
Here is how I fixed it.
This photo, credit Rui Jorge Moreno, is a start:
https://lh4.googleusercontent.com/-6NZb8Rbu3v0/UE2zl5Q7u-I/AAAAAAAAAfk/-iWGqgtu4Xk/s720/2012-09-10%252000.49.24.jpg
The pictured plate is the main sycnchronizer gear for the film advance, shutter
tension drum and the mirror actuation.
First, the plate needs to be removed. Take off the three screws shown.
Then, clean out the gears around. Turn the shutter to B or 1/60 (manual
setting).
If you press the shutter release, you'll see that the thin bar to the bottom of
the photo moves. There is a pair of lever under the silver gear that also
moves. If you move the top and bottom, you'll see that the film advance frees
up. That is a great essential first step.
Also look at what the big thick bar is doing. It activates the mirror
movement, and it needs to move too. Take this opportunity to study the
mechanism and clean things.
On my camera, the reverse lock (forked) lever was completely loose. It is also
under the silver gear and needs to move freely. You need to remove the mirror
mover bar, via its big cross-head screw. THIS SCREW IS A LEFT HAND SCREW !!!!!
Remove the bar and secure the reverse lock (forked) lever.
Then put the mirror lever back into place.
Now, the camera gears need to be timed correctly. You will find that the film
advance finishes in 3 positions. One is the correct one - and it ends with the
rabbit ears of the silver gear in the right place, per the photo.
Under the synchronization plate (that you've removed), you'll find the shutter
tension drum. Advance it to the tensioned position - it will click into place.
Advance the film advance to the right place. Now re-install the
synchronization plate, with the gears in the right place and the cutouts in the
correct orientation.
Now it should all work.
Vick
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