MINOLTA - Minolta HiMatic AF2 AF Adjustment

This comprehensive technical guide documents the complete autofocus mechanism of the Minolta HiMatic AF2 camera. The manual begins with a detailed description of Minolta's active near-infrared rangefinding system, capable of performing range measurements in both daylight and darkness conditions. An explanatory diagram illustrates the full optical architecture, featuring the range finder LED, projection and receiver lenses, SPD light sensor, and signal processing circuits. The document provides thorough explanations of the system's operating principles, including infrared light detection, signal processing through the zone discriminating circuit, and lens motor control. A theoretical section describes the triangulation principle employed to calculate object distance. The adjustment procedures form the core of this guide, featuring a comprehensive verification table across multiple distances (from 0.9 m to 2.35 m) with corresponding lens stop positions. Detailed illustrations demonstrate the corrective positioning of the rangefinder adjustment bush and include flash distance limit verification checks. The technical documentation is further enhanced by circuit block diagrams and photographs of the main circuit board assembly, providing technicians with the essential information needed for precise autofocus calibration and troubleshooting.