NIKON - nikon F Photomic FTN service

Comprehensive service manual for the Nikon F Photomic FTN, covering complete maintenance and repair of the integrated light meter system. The guide explains the electrical operation of the light measurement circuit with an annotated schematic showing circuit configuration in both test and meter modes. You'll find detailed coverage of CdS photocell function, adjustment potentiometers, and all critical electrical components that enable metering operation. The troubleshooting section addresses common failures—weak battery performance, poor electrical contacts, main potentiometer defects, and sensitivity drift—with each symptom correlated to probable causes and proven solutions. For calibration and adjustment, the manual provides step-by-step procedures using an 18% gray card and measurement against calibrated light sources, covering sensitivity adjustment and meter test calibration. The disassembly section gives precise instructions for safely accessing internal components, including cover removal, trimmer potentiometer access, cable disconnection, and case separation. Cleaning guidance recommends gentle solutions and lint-free swabs, with specific cautions against spray cleaners and abrasive methods. Annotated photographs show exact screw locations, electrical contact points, and critical assemblies, making the repair process clear and methodical.