Originally posted by MarkJerling I would have thought that, when set on 'A', you should be able to adjust from body. I have a few of that era lenses, and I'm pretty sure you don't need to use the aperture ring.
It should work with the aperture ring set to A. If it doesn't there is probably some contact problem, there may be some play in the pin retraction mechnism or dirt on the pin.
When the aperture ring is turned off the A position, one of the contacts on the mount is retracted, the mechanism for that might be broken.
regards
Jan