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Heradel
Tinkerer
Username: Heradel
Post Number: 1
Registered: 02-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, February 15, 2009 - 02:49 pm: | 
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I got pointed here from the I Shoot Film group on flickr, and didn't find anything similar when searching through the archives.
I just put my first roll through a new-to-me-yet-older-than-me well used FM2n and found that the film advance lever/winder doesn't always move the film as far as it needs to (from about 7.5mm short to spot-on). I think the rate at which I'm pushing the lever might be a factor, but haven't really seen a difference when I looked at how far the spool moved when I tried a few times with the back open.
It came with an MD-12 that advances it correctly, so it's not a huge issue as I can just use that, but I would like to try to repair it.
I'm a student so I'd rather try to do it myself rather than take it somewhere unless it's a cheap repair (I'm in NYC if that helps). I've got some tools, and am fairly dextrous.
I searched online but couldn't find the repair manual except behind a paywall, so if anyone has that It would be much appreciated. |
Rick_oleson
Tinkerer
Username: Rick_oleson
Post Number: 802
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, February 15, 2009 - 04:12 pm: |
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The fact that the winder doesn't have the same problem puzzles me a bit. The film is advanced by the toothed sprocket shaft that's between the shutter opening and the takeup spool, and winding on, either with your thumb or the MD12, should turn this shaft through 8 sprocket holes worth of rotation. What happens sometimes with a lot of wear is that the inner shaft inside the sprockets rotates without rotating the outer part with it. These 2 parts disengage to allow you to rewind the film, and with a lot of use the tab/slot where they come together can wear out and let the outer shaft slip. But it should behave more or less the same with or without the power winder.
I have never taken the sprocket shaft out of an FM2; in most cameras it requires more disassembly than you'd think it would. There are a couple of little set screws down at the bottom end of the shaft that MIGHT give you a clue, but then again they might get you in trouble. Right now I'm not feeling adventurous enough to pull them out of my FM2 to find out. |
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