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Message: <blockquote data-quote="SkvLTD" data-source="post: 497899" data-attributes="member: 12855">D lenses just have a pre-programmed chip that doesn't connect to anything, similar to the chinese kit ones you can get for D conversions, right? Might just be a busted chip piece and if its build into the housing you'd have to figure a way to replace the innards and then re-program it. Looking at the service manual for 1.8D, it connects to either a plastic harness or some kind of ribbon, in which case one of the trace contacts may have gone bad with age/moisture damage and you'd have to re-connect it with a thin wire and solder.Get a multimeter and test for resistance to find the contact points and see if one of them doesn't "ring" through.</blockquote>