DURST - Durst Elite2000 AF2000 Service V2

Comprehensive service manual for DURST Elite 2000 and AF 2000 autofocus systems designed for Durst M 805 and L 1200 enlargers. This technical documentation covers three main variants in detail: Elite 2000 TIM (with timer), Elite 2000 (autofocus only), and Elite 2000 MOT (with motorized head movement control). The manual provides complete technical specifications including operating ranges, electronic component ratings, and precision characteristics. It details critical components: Z 80 microprocessor, EPROM and RAM memory modules, control circuits and interfaces. A substantial section describes the autofocus system operation utilizing a feedback potentiometer and binary counters for analog-to-digital conversion. Documentation includes detailed factor potentiometer calibration procedures, comprehensive test programs with operational entry procedures, and diagnostic flowcharts for processor, keyboard, display and power supply circuits. Specialized troubleshooting charts address specific failures: lamp relay, timer (TIM), head movement (MOT), and motor control. Each section incorporates precise voltage measurements, logic component truth tables, and component replacement recommendations. The manual also covers lens motor operation, interface PCB functionality, and includes solid state device specifications with electrical characteristics for all integrated circuits used throughout the system.