John,

        I recently had reason to contact Vision/JPI and spoke with one of the tech support gentleman still familiar with the vision system. With their assisstance I opened the DPU figured out the bad resistor and replaced it, works good. I think I had to leave a message but had a return call within 24 hours or less. Overall it was a very satisfactory experience.   Just my 2 cents.       Kai Ogston