CANON - canon lens 35 350

Complete service manual for the Canon EF 35-350mm 1:3.5-5.6 L USM lens, a premium zoom optic designed for professional photography. This workshop manual delivers authoritative technical information for all repair, maintenance, and calibration work on this complex ultrasonic-motor lens. The document is structured into five major sections covering general information with development rationale and full optical specifications; detailed technical architecture of all mechanical components, electronic circuits, and motorized systems; an extensive repair section with step-by-step disassembly, reassembly, and adjustment procedures; a comprehensive parts catalog with exploded-view illustrations; and complete electrical schematics with circuit board layouts. Core service procedures include front optical unit disassembly, USM motor unit removal and service, EMD motorized diaphragm replacement, and primary lens element work. Extensive adjustment tables address tilt compensation, focus calibration across wide and telephoto ranges, focus compensation for large apertures, motor pulse tuning, and zoom brush position alignment. Full wiring diagrams map the complete control and drive architecture, detailing signal paths, transmission specifications, and the mechanical-electrical integration necessary for accurate focus, aperture, and zoom control. An essential reference for qualified lens technicians and service professionals handling Canon EF mount optics.