BELL & HOWELL - bh projector 566

Complete service manual for the Bell & Howell Filmosound Design 566A (60 cycles) and 566X (50 cycles) projectors. This comprehensive technical reference covers operation, maintenance, and repair of these 16mm high-intensity arc projectors featuring automatic threading capability. The manual provides detailed feature descriptions, an extensive parts list with exploded-view illustrations, and systematic lubrication and cleaning procedures. A comprehensive troubleshooting guide addresses mechanical, electrical, and acoustic issues, including film transport problems (loss of loops, film slippage, sprocket malfunction), projection defects (film jump, double image, focus errors), and sound system failures (distortion, low volume, crackling, frequency issues). Detailed disassembly and reassembly procedures are included for the complete mechanism, along with precise adjustment instructions for optical alignment, shuttle stroke, loop restorer clearance, soundhead positioning, and exciter lamp cover clearance. The document features complete wiring diagrams, electrical test point locations, amplifier schematic diagrams, and component specifications. A section on specialized service tools supports technical interventions. The publication, originally issued in November 1966, is enhanced by a December 1970 supplement addressing models 566T and 566EXT, which incorporate integrated circuit amplification systems for both 60-cycle and 50-cycle electrical standards.