How to repair...
How to repair...
Don't worry, this is a very simple repair (all other factors being equal) and entirely suitable for someone with no previous experience (which may or may not be you). The problem is what Maizenberg suggests old-timer camera repairmen (are they ever women?) call the 'the exposure lever has jumped over' condition -- pretty descriptive as you'll see.
You'll need a jeweller's screwdriver small enough to undo the screws which hold the top cover. Loosen the set screws which hold the speed dial and remove it by pulling upwards. Loosen (but don't remove) the set screw which holds the sync dial. Remove the screws along the rear edge of the top cover and the one below the rangefinder window front middle. Loosen the set screw holding the shutter wind knob and unscrew the knob (anticlock). Remove the two screws below the knob. Lift away the top cover.
Beneath and to the left (with the camera facing you) is the shutter speed mechanism, partially obscured by the flash sync module. Remove this latter by undoing the three screws which hold it and lift it away.
Now look closely at the shutter speed stack. There's a brass gear wheel with a little pin on its underside. It can just be seen in the enclosed pic (not very clear and you don't have to go as far with the strip-down, I was replacing the shutter in this camera). What has happened is this pin is now on the 'wrong' side of the exposure speed lever below it.
To reverse the condition, reinstate the shutter wind knob -- screw it back into place and carefully tighten the set screw. Using your thumb nail or the screwdriver as a lever, gently lift the edge of the brass gear (or the triangular protuberance of the plate above it) while cocking the shutter using the knob in the usual way. This process should result in the exposure lever passing beneath the pin described above until it's on the other side of it.
Fire the shutter, wind on, fire again, all the while observing what happens when with the exposure lever and pin. The lever and pin should now be correctly sync'd. If all is well put the top cover back on by reversing the procedure outlined above (remembering to reinstate the exposure module).
Hope this helps.
BTW, Maizenberg suggests that later Zorki 4s have a more durable gear and plate which eliminates the condition but I've yet to see one.
Jerry