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Corigami
Tinkerer
Username: Corigami
Post Number: 1
Registered: 10-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, October 07, 2011 - 11:35 pm: | 
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I just bought a Yashica 12 that appeared to be in fantastic condition. However, after winding and firing the shutter it opens, but doesn't close back up at all until the crank is wound again. If the aperture is set to something smaller than the max it will also stay closed until the crank is wound. Is my shutter just in need of some cleaning or is it broken? Can I repair it myself?
Thanks! |
Dirbel
Tinkerer
Username: Dirbel
Post Number: 51
Registered: 04-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 08, 2011 - 09:42 am: |
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It might just need some cleaning - oil on the shutter blades has the effect you describe.
I am not familiar with the Yashica 12, but a search here might bring some info,
Dirk |
Mareklew
Tinkerer
Username: Mareklew
Post Number: 240
Registered: 03-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 08, 2011 - 10:07 am: |
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1) Aperture in TLR is always at the preset value, so this is not a malfunction.
2) If the shutter opens and never closes, then it means the retarder (the part that's actually counting the exposure time) is jammed or broken.
Try GENTLY changing the shutter speeds. There should be some sound of gears whirring when you switch the slowest speeds (1s, 1/2s etc). If you can't hear anything or can't effortlessly change speeds, then you nailed it. However, even if you can do it, it still could be jammed (it's a true negative, but not always true positive test)...
True problem will arise if it is/was jammed and somebody forced the speed selector over the jam. Then it's broken...
Whichever way, there's no hope for help without at least partial disassembly. You will find a lot of suggestions of flushing the whole shutter with lighter fluid, I recommend against. Even if you get parts to move by this treatment, you just shufled the junk inside around and the shutter will neither work reliably, nor long, and once it fails the camera will be permanently junk.
I have participated in a few discussions about servicing this shutter on this board, use search.
Don't restrict it to Yashica 12, look for 124 124G, Mat etc.
Marek |
Corigami
Tinkerer
Username: Corigami
Post Number: 2
Registered: 10-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 08, 2011 - 10:07 am: |
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Ok, thanks for the help. I searched around the forum a bit and couldn't find anything about this specific problem, sorry about that. |
Corigami
Tinkerer
Username: Corigami
Post Number: 3
Registered: 10-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 09, 2011 - 08:14 pm: |
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While waiting over the weekend for the repair shop to open, I played with the camera a bit more and noticed that after firing the shutter the blades were peeking out just the tiniest bit when they were supposed to close. I wasn't sure if they were closing more than they had been or if I just hadn't noticed, but I kept winding the shutter and firing it over and over again. After a few more times I noticed the blades were definitely closing together more. I wound and fired the shutter a dozen or so more times and finally they snapped back together completely in perfect time! After a couple misfires, it looks like the camera is in perfect working order now. Hopefully they'll stay working just fine! |
Mareklew
Tinkerer
Username: Mareklew
Post Number: 242
Registered: 03-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, October 10, 2011 - 03:17 am: |
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pity for the camera. |
Br1078lum
Tinkerer
Username: Br1078lum
Post Number: 151
Registered: 11-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, October 10, 2011 - 10:46 am: |
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Corigami, the shutter was probably stuck due to old lubricant and dust gumming up the works. I had a similar problem on a Retina that finally went away with many actuations of the winding and release. Your camera still could use a good cleaning though, as you never know when the problem will return.
PF |
