BELL & HOWELL - bh projector 256

Comprehensive service and maintenance manual for the Bell & Howell Design 256 8-mm autoload projector, covering models 256-A, 256-B, 256-AS, 256-EX, and 256-EXL. This technical reference provides complete procedures for servicing, repairing, and adjusting these projection devices to ensure reliable operation. The manual begins with an introduction to the auto-threading principles, explaining the self-loading mechanism and the film path through the projector. Disassembly and reassembly procedures are extensively documented with step-by-step instructions accompanied by numbered technical diagrams and cross-references. A comprehensive lubrication table identifies appropriate products and application methods for all mechanical components. An extensive troubleshooting section addresses common issues including picture flicker, film scratching, soft focus, jumpy projection, auto-threading failures, and abnormal noise generation. Additional technical sections cover final testing procedures, reel arm torque adjustment, shuttle tooth protrusion gauging, picture frame adjustment, and optical axis alignment. A detailed parts catalog with exploded-view illustrations helps technicians identify and order replacement components specific to each projector model, making this manual an essential resource for service professionals and qualified repair technicians.