VIVITAR - Vivitar 285 service manual

Comprehensive service manual for the Vivitar Electronic Flash Unit Model 285 (Vivitar Part Number 3000008). This workshop manual is the technical reference for professional service technicians and equipped repair specialists working on this flash system. The manual opens with complete specifications covering flash duration across both operating modes—automatic range from 1/1000 to 1/30000 of a second and 1/1000 second in manual mode—along with illumination coverage patterns at Super Wide, Wide, Normal, and Tele settings. Color temperature is rated at 6000°K, with synchronization via standard hot shoe or shutter cord connection. Power options are thoroughly documented: four AA alkaline batteries yield approximately 75 flashes, the optional NC-3 NiCad pack provides around 45 flashes, and the SB-6 AC adapter enables continuous operation. The guide includes automatic f-stop calculation tables paired with working distance ranges across film speeds from ASA 25 through 400 and DIN 15 to 27. Exploded assembly drawings and detailed parts lists break down the body assembly, sensor assembly, individual PC board assemblies (A, B, C, and D), and all related subcomponents. Complete electrical schematics and PC board foil diagrams provide the circuit topology and layer artwork necessary for diagnostics and component-level repair work.

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