For the 2SC5315, a JIS-coded NPN bipolar transistor, this 126 KB PDF is indexed as a schematic but most probably holds the component datasheet. Look for absolute maximum ratings, gain and frequency figures, typical curves and the package with lead identification. The name does not say who made the part or which equipment it came from, so check the marking first. It opens in any PDF viewer and helps when testing a suspect device out of circuit or sourcing a replacement.
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.