Question about Nikon FM3A 35mm SLR Camera

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Mirror lock up when firing in A mode.

Hi everyone. So I have this issue with my FM3A, the mirror locks up when the dial is in 'A' settings and the cranker seems to be stuck. It is working fine in other modes though. Hope someone can give some information/tips on how to fix this. Thank you!

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  • Nikon Master
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Posted on Jul 18, 2016

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Posted on Jan 02, 2017

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SOURCE: Mirror Locked in Up Position

When you say you put in a new roll of film, did the camera advance the film with the mirror locked up? Have you tried triggering the shutter few times to release the mirror? If that doesn't work, open the back of the camera. Turn the film take up spool in one direction...that should release the mirror down. Turn it also in the opposite direction. If that doesn't work, reach inside the lens mount opening and pull the mirror (very very gently) down. Don't force it down if it doesn't want to go. Sometimes that releases the mechanism that freezes from sitting idle for too long. It is always a good idea to take the camera out and triger few frames every couple of months to keep things lubricated. Let me know if that fixes it. AJ.

Posted on Sep 21, 2007

  • 302 Answers

SOURCE: Nikon F100 does not advance film to start of roll,

Jim, it really sounds like one of threethings. Either will require a repair shop.
1. the film sensor is not recognizing film in the film chamber, or film across the back, therefore not telling the advance motor to advance film...
2. The film advance motor itself needs replaced.
3. The rear door latch switch needs replaced.
Since everything else seems to do OK, I doubt the main computer board is bad.

Posted on Feb 03, 2010

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SOURCE: mirror locked up on Nikon F75

Try pressing and releasing the shutter button. If that doesn't do anything, then turn the camera off and on and press and release the shutter button. If that still doesn't do anything, then turn the camera off, remove and reinsert the batteries (or a fresh set, if readily available), turn the camera on, and press and release the shutter button.

I ran across a Nikon N80 last week which hadn't been used for many moons. I tried the shutter and the mirror promptly locked up. It took about half a dozen tries, but the mirror eventually shook loose or whatever, and the camera now works perfectly.

If the above procedure doesn't do it, then you may have to take it in to a good camera shop for a CLA (clean-lubricate-adjust), the camera equivalent of an automobile tune-up.

Posted on Feb 05, 2010

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