VIVITAR - Vivitar 285 SPT
Technical adjustment guide for the Vivitar model 285 electronic flash unit. This document outlines the procedures for calibrating three critical parameters: flash output in automatic mode (potentiometer A), green LED activation threshold (potentiometer B), and main capacitor voltage setting (potentiometer C). It provides a complete adjustment sequence with reference voltage values—260V for red LED activation, 295V for green LED engagement, and 330V at full power—along with specific measurement procedures using a voltmeter. A diagram displays the location of adjustment points on the rear housing of the unit. The guide includes a section on frequently encountered repair issues, addressing common problems such as improper green LED activation threshold and erratic flash operation caused by cold solder joints at the mounting shoe contact. Essential for service technicians and enthusiasts performing calibration or troubleshooting on this professional-grade flash model.
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