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 workshop manual serves as an essential technical reference for servicing, repairing, and adjusting these projection devices to ensure reliable operation. The manual opens with a thorough explanation of the auto-threading mechanism, detailing the self-loading principles and film path through the projector. Disassembly and reassembly procedures are fully documented with step-by-step instructions supported by numbered technical diagrams and cross-references throughout. A comprehensive lubrication table identifies appropriate products and correct application methods for every mechanical component requiring maintenance. The extensive troubleshooting guide addresses common operational issues including picture flicker, film scratching, soft focus, jumpy projection, auto-threading failures, and abnormal noise. Additional sections cover final testing procedures, reel arm torque adjustment, shuttle tooth protrusion gauging, picture frame adjustment, and optical axis alignment. A detailed parts list with exploded-view illustrations helps technicians quickly identify and order replacement components specific to each projector model. This manual is indispensable for service professionals and repair technicians who need to maintain or restore these Bell & Howell projection systems to proper working condition.