A 145 KB PDF filed under schematics and named only after the part number 2SC2814, so it is most likely the component's datasheet rather than a board diagram. Under the Japanese JIS naming system, the 2SC prefix marks an NPN bipolar transistor. The name states no package, ratings or manufacturer. A technician would use such a sheet to confirm the pinout, maximum voltage and current, and gain class before choosing a replacement. Check the marking on the part against the document before relying on it.
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.