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Leslie
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 11, 2005 - 05:22 am: | 
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After cleaning, the Synchro-Compur on a Perkeo II works fine, except when tensioning the shutter. When the lever is tensioned about halfway, if I remove my finger the lever stops and the shutter blades partially open. They close again when the lever is fully tensioned and the shutter cocks normally. The fault is intermittent; most of the time the blades stay closed. I should be grateful for any advice. |
Dan Mitchell
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 11, 2005 - 10:45 am: |
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I'm not sure this is a problem as normally you don't stop partway through tensioning a shutter. 
However, this type of problem is usually a broken or displaced blade closing spring. The spring holds the blades shut during cocking and also helps force them to close quickly.
Look at this picture:
http://daniel.mitchell.name/cameras/compur/actlever.jpg
The spring in question is at the top of the shutter. |
Leslie
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, February 12, 2005 - 09:08 am: |
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Dan, Many thanks for the illustration. The problem seems to be a little moving attachment on the underside of the cocking ring, the end of which looks rather like a bird's head, although I'm sure it has a more sensible name. If tension on the cocking lever is relaxed before the cocking action is complete, the cocking lever moves back a fraction and the "bird's head" catches on the lever that opens the blades and partially opens them. Am I right in thinking that it should move freely past the blade opening lever, allowing the cocking lever to return to rest if the cocking action is not completed? Sometimes it just rests on the lever without opening the blades, allowing the cocking lever to remain in a half cocked position. |
Dan Mitchell
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, February 12, 2005 - 02:24 pm: |
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The "bird's head" thing has a spring on it also. Make sure that spring hasn't come loose or broken and the part is not sticking.
Also check the latch lever and see if it is sticky. Maybe the latch is not swinging into position fast enough to hold the cocking ring or the place on the cocking ring where the latch catches has been worn?
Beyond that, it may just be that something has gotten bent or worn. Those Compur shutters are "finicky." It is difficult to get that cocking ring reseated. If it is slightly out of position things don't work right. |
