When pressing shutter release button, sort of a hollow clicking sound and no image.
SOURCE: I just got a Mamiya 645 Pro off ebay, but the
Test these instructions above, I hope it will work
SOURCE: Mamiya 645 pro shutter doesn't fire
First thing that comes to mind on this camera is that it's a modular camera. This means the film back can be changed mid roll so there is what is called a Dark Slide between the film back and the body.
The dark slide needs to be removed before the camera will function. Also depending on how "new" the film back is there may be a dark slide holder/sleeve on the back side of the film back.
So you remove the dark slide and slide is into the holder so first you don't loose it and also it doesn't get bent.
Diagram
SOURCE: my 645 1000s shutter buttons
You might want to check and make sure the battery is still good. If you purchased the camera used and didn't change the battery then this might be the case.
But in the mean time this is what you need to do:
1st-make sure that the shutter speed dial is set to any shutter speed other than the red circle w/red ring. If your camera is set to that it will drain your battery when not in use since it is designed to be an automatic setting. I set mine to 1/125th to do this push in the circular dial on the side and at the same time turn the knob.
2nd- locate the 2 levers on the opposite side of the shutter speed dial. Once you found them then position the back lever all the way forward towards the setting for "MULTI" and position the lever towards the front straight up.
3rd- then wind the film crank till it won't wind anymore and depress the shutter, if it is wound and the shutter release is still stuck then skip to the fourth step, if something happened and you heard a click then still proceed to the next step because no the shutter release will be temporarily stuck.
4th-Once both of these levers are in this position there should be a red
button just behind the shutter release button on the top right side of
the camera.... drum roll please...."Push the red button" what you
should hear is a rather loud click, this click is the mirror releasing allowing you to: 1 wind the film crank and take another picture and 2 this also now allows you to see through the lens again (assuming that you have a lens on the camera).
In Conclusion: without a battery that is fully functional in the camera this is how the camera will operate once you get a battery for your camera then reposition the levers on the side of the camera opposite of what I suggested (this will be the normal operating mode for the camera with a battery) then when you wind the film crank and depress the shutter everything will function normally.
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