NIKON - Nikon PhotomicTn Finder Service

Complete service manual for the Nikon Photomic-TN Finder (Work No. 20FD5), the professional metering viewfinder assembly designed for the Nikon F camera system and published by Nippon Kogaku K.K. in Tokyo. This workshop manual serves as the definitive technical reference for maintenance, repair, and precision adjustment of this sophisticated optical instrument. Covers full disassembly and reassembly sequences for all major subassemblies, including the film speed (ASA) scale plate, T-dial knobs, coupling mechanisms, dial gears, top cover components, mirror base assemblies, CdS light-sensitive cells, pentaprism and eyepiece units, and the resistor gear mechanism. Dedicated troubleshooting sections address switch malfunctions, pentaprism and eyepiece cleaning, and meter needle window maintenance. The repair guide includes detailed exploded-view technical drawings (Figures 1–3 shown), component specifications, step-by-step adjustment procedures, electronic circuit schematics, comprehensive diagnostic charts, and calibration requirements for brightness measurement. Documents the specialized tools and test equipment necessary for proper professional service. Establishes compatibility parameters with Nikon F camera bodies and alignment conditions essential for accurate exposure metering performance.