So I finally find an affordable Aria that was said ti be fully working, but once it's in hand, it turns out that the metering system and shutter don't always get the correct physical position of the f-stop ring. More often than not, it's a full 'click' off, no matter where in the range it's set. If I jiggle and twist the ring a bit, I can sometimes get it to read correctly, but this is a huge annoyance to monitor it and try to (re)set it if it's wrong. Is this a known issue, and/or is there a fix available to either work around the issue or fix it permanently?
This is day one with this and I'll have to decide whether I need to pursue a refund or try to get it fixed via a depot repair, IF it's affordable. Ideas?
It's not a known problem to me but the aperture info is transferred in the same way as many other models and there are a few reasons why it can be wrong. The maximum aperture of the lens is transferred along with the number of stops the lens has been stopped down. The two together are used to display the aperture in use. The fact you say it can work if you jiggle the aperture ring suggests the problem is with the Aperture Linkage. If it was a problem with the maximum aperture coupling (Aperture Scale Coupling in the picture below) then moving the aperture ring shouldn't affect it.
I would check the condition of the Aperture Coupling lug in the camera. It's plastic and can get worn or even partly broken. It's the most common reason I see for this type of problem. Also try moving the ring that the lug is part of with your finger to see if it's sticking or in anyway stiff or tight.
Thanks for the details and image, @peterr ... I've not seen any mechanical problems or nicks on the adjustment ring or found anything that looks missing or is loose. The ring moves easily and doesn't appear to be obstructed in some way, so I'm assuming it's an adjustment issue and would require something beyond my capabilities to be able to affect a repair on my own.
After the initial test with a known to be good and working Zeiss 35-70mm Vario Sonnar... it might have been worn at the mount flange edge just enough to cause the readings to bounce around at their tipping point, so it seems to be the only one that I can 'jiggle into' getting a correct reading from time to time. It is certainly not consistent enough in happening to be able to rely on it to stay corrected. A twist in the opposite direction resets it into an incorrect state again. Additionally I've tried more than a half dozen Zeiss lenses in both AE and MM types, as well as an equal number of Yashica ML's to verify that the same basic issue occurs with every lens. Every one of their readings are off by the same relative amount, and no jiggling will correct them.
Sadly, I just can't rely on anything as a workaround in trying to fool the system in any of the auto modes to be able to trust the results, so I've asked the seller for a return/refund.