BELL & HOWELL - bh projector 356 357

Comprehensive service manual for Bell & Howell AUTOLOAD Super 8mm projectors in Design 356 and 357 models. This detailed technical reference guides service technicians through all maintenance, repair, and adjustment procedures for these projectors. The manual begins with a general introduction covering autoload threading principles with theoretical diagrams, followed by complete disassembly procedures organized by major assemblies including film reel systems, film guidance mechanisms, shutter assembly, and optical lens carrier. The reassembly and adjustment section provides step-by-step instructions for component reinstallation with torque specifications, optical and mechanical alignment procedures, and critical adjustments for film transport systems. A dedicated final test section outlines comprehensive operational inspections and verifications. The document incorporates a systematic troubleshooting guide addressing common failures such as projector inoperability, picture flicker, film scratching, jumpy projection, and focus issues, with detailed probable causes and remedies for each condition. Special tools required for service work are illustrated with dimensional specifications. An extensive parts catalog lists replacement components with cross-reference numbers and exploded-view diagrams for all assemblies. Electrical wiring diagrams, lubrication charts, and maintenance specifications complete this comprehensive technical documentation.