Small PDF of 47.2 KB titled only with the part number 2SC5414, filed under schematics although the name points to a component document. Under the Japanese JIS/JEITA scheme the 2SC prefix marks an NPN bipolar transistor, so expect a datasheet with ratings, pinout and package drawing rather than a board diagram. Technicians use such sheets to identify a marked part, confirm the emitter, base and collector order before testing with a meter, and pick a substitute with equal or better voltage, current and frequency 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.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.