For the 2SC4489 NPN bipolar transistor, as indicated by the JIS 2SC prefix, this 154 KB PDF serves as the component datasheet even though it is catalogued under schematics. Manufacturer and package are not stated in the name. Expect maximum ratings, characteristics and outline data. A technician uses it to identify leads, check suspected shorts, and choose an equivalent with equal or better voltage, current and dissipation limits. Verify the case fits the PCB pads before soldering.
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.