BELL & HOWELL - bh projector 566

Complete service manual for the Bell & Howell Filmosound Design 566A (60 cycles) and 566X (50 cycles) projectors. This comprehensive workshop manual covers operation, maintenance, and repair of these 16mm high-intensity arc projectors equipped with automatic threading capability. The technical reference includes detailed feature descriptions, an extensive parts list with exploded-view illustrations, and systematic lubrication and cleaning procedures essential for long-term reliability. The troubleshooting guide addresses mechanical, electrical, and acoustic issues with practical solutions: film transport problems such as loss of loops, film slippage, and sprocket malfunction; projection defects including film jump, double image, and focus errors; and sound system failures encompassing distortion, low volume, crackling, and frequency anomalies. Full disassembly and reassembly procedures cover the complete mechanism with precise adjustment instructions for optical alignment, shuttle stroke, loop restorer clearance, soundhead positioning, and exciter lamp cover clearance. Complete wiring diagrams and electrical test point locations are provided alongside amplifier schematic diagrams and component specifications for systematic diagnostics. A dedicated section on specialized service tools supports efficient technical intervention. Originally published November 1966, the manual is supplemented by a December 1970 update covering models 566T and 566EXT, which incorporate integrated circuit amplification systems for both 60-cycle and 50-cycle electrical standards.