BELL & HOWELL - BellHowell FilmosoundProjectors Service

Comprehensive service manual for Bell & Howell Filmosound projectors, addressing Design 179, Design 185, and Design 385 models. This technical publication provides detailed disassembly, repair, and reassembly procedures for sound film projection equipment. The manual presents specialized service tools required for maintenance, complete with photographic illustrations and a functional index of 25 maintenance tools. Instructions cover progressive disassembly of all major assemblies: projector and housing, amplifier assembly, gear case, motor and governor assembly, governor cap, lamp house, film reel arms, loudspeaker, and sound head assembly. For each major component, step-by-step procedures are provided with numbered reference figures enabling precise component identification. Reassembly guidance describes proper repositioning of all elements, including critical pressure plate adjustments, sprocket synchronization, and speed regulation. Specialized sections address optical and mechanical component cleaning procedures, film running tests, and comprehensive final inspections. Wiring diagrams and assembly illustrations document electrical configurations across different model variations. The document emphasizes proper lubrication practices using Bell & Howell specified oils and greases, detailed bearing replacement procedures, and critical adjustments necessary for optimal sound reproduction. Special attention is given to safety mechanisms, shutter operation, and film handling parts throughout the service procedures.