Your post is like old times, Vick. Welcome to the List.
Charlie
On Sun, Jun 16, 2013 at 5:40 PM, Vick Ko <vick.ko@xxxxxxxxxxxx> wrote:
> 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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