2SC4579 datasheet candidate in PDF form, 102 KB, categorised as a schematic. The name follows the JIS convention in which 2SC denotes an NPN bipolar transistor for high-frequency service, and it states no maker, package or revision. Look inside for pinout, absolute maximum ratings, electrical characteristics and package dimensions. Such references help when a transistor reads shorted in diode mode and you need to confirm orientation and find a replacement with comparable voltage, current and gain.
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.