This compact 58 KB PDF is tied to the 2SC2480, with an _E suffix in the name whose meaning the file name does not explain. The 2SC prefix is the JIS designation for NPN transistors, so the document is most likely a datasheet even though it is indexed as a schematic. Use it to read the pin order, maximum ratings and gain figures. Confirm the body marking on the original part, often abbreviated to C2480, before substituting another type.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)