PDF document of 112 KB for the 2SD2280, an NPN bipolar transistor in the Japanese 2SD numbering, filed as a schematic but in practice a datasheet. It provides the ratings, characteristic graphs and pin layout needed when tracking down a failed transistor in a power or driver circuit and choosing a safe replacement. Compare the original part's markings and package with the drawing, and choose a substitute with equal or higher voltage, current and dissipation 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.