Reference PDF for the 2SC5489, 31.3 KB in size and filed as a schematic. In the Japanese JIS convention the 2SC prefix identifies an NPN transistor, so the document is most likely a compact datasheet. It should cover the pinout, case style and the key electrical limits. Technicians use such sheets when a transistor tests shorted or open and a replacement is needed. Match the exact package and marking, then compare breakdown voltage, collector current and gain before choosing a substitute.
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.