Brief 41.4 KB PDF for the 2SC3117, which JIS numbering identifies as an NPN bipolar transistor. Indexed as a schematic, it most likely holds a concise data sheet with ratings and a pin diagram. The device on the board will generally read C3117. The name gives no package or manufacturer. Before swapping a suspect part, check the terminal layout here, test the junctions in diode mode, and confirm any alternative meets the voltage and current ratings and fits the same footprint.
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.