A compact 21.2 KB PDF titled after the 2SC4080, stored as a schematic but best treated as a transistor datasheet. JIS numbering uses 2SC for NPN bipolar transistors. The file name offers nothing beyond the part number, so ratings, package and manufacturer have to be read from the pages. In repair work this kind of sheet answers practical questions: which leg is which, how much voltage the part tolerates and what gain to expect. Make sure the component on your board matches this exact number before substituting.
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.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.