Nikon AF-S Nikkor 400mm f/2.8D ED-II IF Troubleshooting Manual

Official Nikon repair manual for the AF-S Nikkor ED 400mm/f2.8D II IF telephoto lens. This comprehensive technical document provides detailed specifications for this high-performance optical system, including optical construction (11 elements in 9 groups with ED glass elements), autofocus capabilities, and operational modes. The manual covers main specifications such as the maximum aperture of 1:2.8, minimum focus distance of 3.4 meters, and available aperture values from f2.8 to f22. A dedicated section details the 10 mount contacts and their applications, including power supply, clock signal, data transmission, motor pulse outputs, and teleconverter communication—critical information for circuit diagnostics and repair procedures. The document lists compatible accessories including lens caps, cases, various teleconverter models (TC-14E, TC-20E, TC-14E II, TC-20E II, TC-14BS, TC-301S), and protective hoods. An essential section addresses the optical concept of "design frequency," explaining how refractive index variations between production batches require corresponding changes to lens curvature radius, and emphasizing the importance of matching glass design frequency during repair work. Disassembly, assembly, and adjustment procedures reference detailed exploded diagrams and previous service manuals. Published July 2001, this manual serves as an indispensable reference for specialized lens repair technicians.