| Author |
Message |
Gary
| | Posted on Wednesday, December 28, 2005 - 04:52 pm: | 
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I received a Yashica FX-2 35mm SLR that works fine except for the rewind button function on the bottom cover. The button will not depress to allow rewinding a roll of film. Upon opening the back cover it appears that the 2 small screws in the toothed sprocket have been tampered with and one screw was removed or fell out. Any ideas on how this problem might be corrected short of a major repair? The problem was not solved by replacing the screw. Nice all manual camera but probably only has a $50 value when fully functional. I believe most 35mm SLR cameras use the same rewind button principle so this is probably not a Yashica specific problem. Any ideas? |
Don
| | Posted on Friday, December 30, 2005 - 06:14 am: |
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I'm betting that if the screws were removed from the geared sprocket, the bottom plate was also removed. Take off the bottom plate and see if everything is in place,and they're is nothing obstructing the release button. |
Gary
| | Posted on Friday, December 30, 2005 - 06:08 pm: |
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I had the bottom plate off and compared it with another working FR-2. I could not see anything that might jam the rewind button. My guess is the problem is with the rewind shaft or within the geared sprocket. I did not remove top cover yet to see if the jam may have originated up there (unlikely?). Surely I'm not the first person to have a jammed rewind button. There must be a logical answer or solution. |
Glenn Middleton
| | Posted on Saturday, December 31, 2005 - 01:37 pm: |
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Silly thought; if both small screws were removed, is one longer than the other and in wrong position, ie is one a lock screw and the other a stop screw? Have never worked on the FX-2 so cannot really give any other thoughts on this. |
Andre Emond
| | Posted on Wednesday, January 11, 2006 - 06:46 pm: |
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how does an automatic rewind camera work.
Explain the mechanism of pulling the right length of film each time and what makes it rewind at the end of the film.
pictures of mechanism would be nice
Thank you |
Glenn Middleton
| | Posted on Thursday, January 12, 2006 - 09:02 am: |
|
You will find plenty of articles on modern camera function in both books and on the Web. A simple explanation is that the length of film per frame is measured by gearwheels rotating to a fixed stop. The rewind function is operated by a 'torque mechanism', which can be a sophisticated clutch or just an electronic circuit that senses the higher current demand from a stalled motor at the end of film. Many modern 35mm SLR use IR diodes to count the individual sprocket holes, whilst the T90 uses an electronic counter in its function.
In the maintenance specifications for high end SLRs there is always a certain make and type of film specified to be used when setting up the transport parameters. The only camera that could fall into the Classic field if one is generous is the Canon T90 (well I find working on them in the mechanical department is no different to the A1)and the film type for testing is clearly stated.
If you want a good reference book, look up the 'T90 Performance Book' on www.canonfd.com/choose.htm
there is a very good description and 3D diagrams of the auto film transport.
More modern cameras are outside the scope of this Forum and the information is available from other sources. |
