Bronica SQ-A finder going bad

[revdocjim]

The AE finder on my SQ-A has started to give inaccurate readings, leading to photos that are 1-2 stops underexposed. It was working fine as recently as this past summer. I have cleaned all the contact points on the finder and body and lenses, and confirmed that it does this with multiple lenses. Is there anything else I can do myself before giving up and shopping for a new finder or sending it in for repairs? What causes these meters to go bad?

 

[CGW]

No clues on causation. I know competent repair options are scarce for Bronica but Koh's can usually fix sick SQ gear:

http://kohscamera.com/

Otherwise, you may be ahead shopping for a new AE finder. Sorry

 

[NJS]

have you checked if the problem is not actually with the back instead of the prism?

 

[revdocjim]

Oh, I forgot to mention that. I have 3 backs and I get identical readings with all three...
I've also checked the battery.