Once the top plate and all knobs are removed, we can see the viewfinder and metering system. Underneath this assembly is the where these cameras usually jam up through old and dirty lube..
The Zeiss Ikon Contina suffers like many Zeiss cameras from an unfortunate mix of good and bad materials and variable workmanship.  When it works, it will give excellent results, besting just about any consumer 35mm compact of today.
This particular camera was jamming up intermittently.  I've had several of these go through my workshop and generally the cost involved in cleaning them out and setting them up again is prohibitive.  Now and then, of course, someone has a sentimental attachment to a camera and wants it going no matter the cost.

Further info on this model can be viewed here.




















To the left and above we can see what turned out to be the real cause of this camera jamming.  The white plastic disk is normally glued underneath the meter coil to keep dust and dirt out of the mechanism.  In this case it had long ago come away and was occasionally getting stuck in the gearing where I found it..


These two screws plus another one out of sight here will release the entire assembly in one go.

To the right we can see some of the winding gears protruding out from underneath the meter.

On the right below I've removed the meter and viewfinder and a stack of shims (red arrow) is now visible. Also note the sliding shutter tensioning mechanism (blue arrow) that needs a clean up.

































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All material Copyright Robert Ian Axford   

During reassembly, it is important to ensure this lever (red arrow) finds itself resting against the cam (blue arrow) and not underneath it. The brass plate, which can be removed from the dial for easier assembly, has adjustments (tweaks) for taking up slack (green arrows).

Finally, the wind lever on these cameras must be reassembled against some spring tension - the shutter itself is not tensioned however.  I advise setting it up roughly with the lever off, then hold the brass barrel in place with a screwdriver in one of the screw holes. Then, after fitting the lever by swapping the screwdriver with another one that has been poked through the slots here, I insert just one or two screws until I've decided on proper positioning.  That point is reached when the shutter tensions, the film winds and the frame counter moves on a step all at the same point in the lever's stroke.  This can take a few goes to get right!