PDF documentation for the 2SA683 PNP transistor, sized 51.4 KB, with an _E suffix in the name that is not defined. JIS numbering assigns the 2SA prefix to PNP transistors designed for high-frequency operation. A repair technician uses such a sheet to identify collector, base and emitter, read the maximum collector-emitter voltage and current, and see the available gain grades. That information supports out-of-circuit junction testing and selection of a replacement that matches or exceeds the original ratings.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.