THe camera seemed to be working properly so we loaded the film, but the counter stayed at 13, then when we turned the film winder crank, it ran through the roll. The numbers never changed. Once the film was removed, the winding crank isn't engaging and the shutter release button is stuck as well. There's a new battery in the camera.
SOURCE: shutter stays open on mamiya 645 M
Get any crud from the battery out of the works with pH-neutral stuff and q-tips or lint-free towels, and see if it works (without film; might as well check current drain with a bench supply instead of a battery, too) once you've done a satisfactory job of that. Then visit a shop so they can see if the shutter timing is tolerable...and perhaps sometime you can load film in again.
SOURCE: Mamiya M645j film counter not advancing to start when roll loaded
It's a common problem in the 645 - if you want to do it yourself, without a permanent fix, put a DROP ( not a lot ) of lighter fluid, or rubbing alcohol on the tip of a fine screwdriver and apply it to the gear you use to rewind the camera, and turn back and forth a few times. If that doesn't loosen it, it'll have to be disassembled.
SOURCE: Pro-S film back doesn't advance film properly.
There is good chance that the back needs a spring replaced. I've seen them fail many times.
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