[Leica] Fixing a jammed OM4

[philippe.amard at sfr.fr (philippe.amard)]

Vick

I'm also on an Oly list - so is Nathan, and a few of us - maybe you'd  
find more expert Oly tips from there?

Amiti?s
Philippe

Le 16 juin 13 ? 17:52, Vick Ko a ?crit :

> 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.
>
>
>
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