NIKON - Nikon Bulletin FM2N Shutter

Nikon technical service bulletin from January 1985 for authorized repair centers. This workshop manual documents the shutter curtain blade replacement procedure for FM2, FE2, and FA cameras, referenced under technical specification FM2-840024. The bulletin details five major engineering improvements introduced to the shutter mechanism between 1982 and 1983, each addressing durability issues where the thin 0.02mm shutter curtains warped during their traverse across the aperture opening. Key modifications include inner aperture frame re-profiling to eliminate mechanical interference, reinforced honeycomb bracing in the closing curtain assembly, substitution of closing curtain arm material from titanium to high-strength carbon steel, enhanced closing curtain brake design with an additional spring mechanism, and improved rivet design to secure blade positioning and prevent dislocation. The manual features detailed technical illustrations of every modification, step-by-step replacement procedures with installation guidance, and performance verification methods to confirm proper shutter function after service. A comprehensive parts reference table provides exact part numbers and FOB pricing across all three camera models, emphasizing careful handling during service and the importance of customer education on correct shutter maintenance to prevent future issues.