BELL & HOWELL - bh camera design 70

Comprehensive service manual for Bell & Howell Design 70 16mm film cameras, covering models DA, DL, H, DR, and HR. This workshop manual delivers detailed technical guidance across two primary sections: a complete service and repair guide, plus an exhaustive replacement parts list with exploded-view diagrams. The service section opens with model identification by code letter and a complete listing of specialized tools required for camera repair and maintenance. Disassembly procedures systematically address each major assembly—winding key mechanism, hand crank, camera cover, front plate, rear mechanism, and camera frame—with specific instructions for cleaning, inspection, and component-level repairs. The reassembly section provides step-by-step reconstruction covering critical procedures: main drive spring tensioning, governor gear adjustment, speed regulation, sprocket synchronization, aperture calibration, and buck tooth gear alignment. The manual includes final test procedures for film transport, light-leak detection, and operational validation. The parts catalog presents every removable component with part numbers, quantities per assembly, and model-specific usability codes, supported by detailed exploded diagrams for precise identification. Special technical notes highlight critical differences in gear pressure angles between camera generations—14½° versus 20°—essential information for correct reassembly and prevention of excessive noise and premature wear.