This is a long shot, I know, but my hopes are growing dim.
My EF-511 has died, and I am in need of any schematics or repair information anyone might be able to provide. Neither Kyoritsu, Arrowyn, or C.R.I.S. in Arizona (their agent in the U.S.) are able to provide any service or assistance in this regard.
Did you get any responses or find any information on the EF511N tester? I've just bought one cheap on the off chance that it still works. However, there is no camera sensor, so I'll need to fabricate one. Any information would be gratefully received.