Datasheet-style PDF for the 2SC4105, 92.7 KB, catalogued as a schematic. Following the Japanese JIS designation system, 2SC marks an NPN bipolar transistor, and this lower number belongs to an older part generation. The name offers nothing else, so contents are inferred from the type. Expect maximum ratings, hFE ranges and package outline information useful for diode-mode testing and finding equivalents. Before substituting, check that voltage, current and pinout of the replacement match what this document specifies.
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.