DURST - Durst Elite2000 AF2000 Service V2

Comprehensive service manual for the DURST Elite 2000 and AF 2000 autofocus systems, engineered for the Durst M 805 and L 1200 enlargers. This workshop manual provides detailed technical coverage of three primary variants: the Elite 2000 TIM with integrated timer, the Elite 2000 autofocus-only configuration, and the Elite 2000 MOT featuring motorized head movement control. Complete technical specifications include operating ranges, electronic component ratings, and precision tolerances essential for accurate servicing. The manual documents the core processing architecture: Z 80 microprocessor, EPROM and RAM memory modules, and all associated control circuits and interface boards. A substantial section explains autofocus system operation, detailing the feedback potentiometer and binary counter stages used for analog-to-digital conversion. Calibration procedures for the factor potentiometer are presented step-by-step, alongside comprehensive test programs with full operational entry sequences and diagnostic flowcharts covering processor, keyboard, display, and power supply circuits. Specialized troubleshooting sections address common failure modes in the lamp relay, timer module, motorized head movement, and motor control stages. Throughout the manual, precise voltage measurements, logic truth tables, and component specifications support rapid diagnosis and replacement. Additional coverage includes lens motor operation, interface PCB schematic information, and complete solid state device specifications with detailed electrical characteristics for all integrated circuits used in the system.