Question about Mamiya 645 Medium Format Camera

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Mamiya M645j film counter not advancing to start when roll loaded

I have an M645j that's having a problem where the film counter does not automatically advance back to the start when a new film cartridge is loaded.

I've heard that it could be a spring somewhere that's not working right, and the film counter otherwise works fine when I wind the gear back to the start with my finger manually.

How can this be fixed? Thanks

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  • Anonymous Feb 27, 2009

    same

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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.

Posted on Jan 08, 2009

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If you need a manual, you can download one from
http://butkus.org/chinon/mamiya/mamiya_645af/mamiya_645af.htm

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-Loading: Make sure you are not over loading the film before you start to shoot. I have sometimes turned the film advance too many times and end up cutting down on the amount of usable film.
-Are you loading the film in a dark area and careful to close up the back just after it has started to load to avoid exposing it?
-Shooting: Are you metering properly when shooting? Obviously underexposed images won't develop. You should consider a hand held meter.
-Shooting: Are you advancing the film more than it needs to be after you take your shot? Watch the film counter and feel for that click as it hits the next frame. I have advanced past the next shot many times by accident.
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Rewinding but counter not resetting and light meter dead? Prolly bad connector or ic inside camera = repair shop.

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1 Answer

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Hello. 35mm cameras back in the day used to suffer from this irritating problem. There is a small button that is pressed by the door edge when you close the back. Due to age(flexing and slop) that occurs with normal wear, the metal edge becomes ever-so-slightly bent, resulting in a less-than-needed pressure on this button. The button, when held properly by the back, captures a little internal gear mounted on the film counter dial--preventing its spring-loaded return. When you remove the back to re-load film, the counter immediately jumps back to "start". As the film advances, the roll increases in size and pressure against the door, causing the symptom. Go to a camera store with knowledgeable sales people and you might find one who knows how to re-work the back just-so to fix it. To be absolutely sure, however, you'll need to buy another back.
On some medium-format cams, there is a little raised "bump" on the edge of the door that precisely matches up to the position of the button. If this is the case, and you are careful, it can be gently but firmly squeezed to make it stick out more, increasing the pressure on the counter button.---Rick

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F--


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1 Answer

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