Named 2SC5360, this 117 KB PDF concerns a Japanese JIS-registered NPN transistor, the 2SC prefix denoting a high-frequency type. It is categorised as a schematic but almost certainly holds the part datasheet rather than a circuit drawing for any particular device. Use it to look up pinout, package dimensions, maximum collector voltage and current, and gain grouping when diagnosing a failed stage or cross-referencing an alternative. Confirm the marking and package of the fitted part before substituting.
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.