NIKON - nikon finder photomic tn

Comprehensive service manual for the Nikon Photomic TN finder (Work No. 20FD5) and Photomic FTN finder (Work No. 20FD9) accessories designed for Nikon F camera systems. This workshop manual delivers complete repair and maintenance procedures for these precision optical and mechanical assemblies, essential for anyone restoring or servicing classic Nikon rangefinder equipment. Detailed exploded diagrams show the internal architecture of shutter speed and ASA dials, focusing mechanisms, and the brightness measurement circuits that define these finders' performance. Step-by-step instructions guide you through replacing worn or damaged components including ASA film speed scale plates, selection knobs, mechanical couplings, gear assemblies, mirror elements, CdS photocell units, resistor networks, and pentaprism sections. The manual covers practical maintenance work such as cleaning delicate optical and mechanical assemblies, repositioning meter needle windows for accuracy, fine-tuning functional resistor circuits, and methodical troubleshooting when problems arise. An electrical schematic diagram and systematic fault-finding chart speed up diagnosis of electrical and mechanical failures. You'll also find main parts specifications, brightness measurement standards, and the specialized tools needed for competent repair work. Invaluable for professional camera service technicians, restoration specialists, and Nikon F system enthusiasts seeking reliable repair documentation.