Yashica Electro Pro shutter

john neal

fallor ergo sum
Local time
9:50 AM
Joined
Jan 10, 2005
Messages
1,684
I would appreciate any help that you guys can offer on a problem with a very nice condition Pro that I just got from a member here.

I can only get a yellow light with this camera, regardless of light conditions or asa selected.

I have fitted a new battery, replaced the pad and cleaned the sliding contacts. I found the timing capacitor was the original at 3.9 uf, not having this odd value or any means to check its condition, I have tried substituting 3.3 and 4.7, but it does not make any difference - I get a yellow light and, at best, something like a 1/60 shutter, but normally 1/500 as if the capacitor is not charging.

Checking the Cds cell out of circuit shows that it does change resistance from full open to closed, and the range is from 3 to 200 Ohms but I cannot find any reference figures for this - does anyone know if this is correct? If the range should be 3 to 20,000 Ohms, I guess that could be a problem.

Failing this, I think a replacement module will be required.

Anyone got any ideas?
 
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