Plain 2SC5111 is the whole name of this 245 KB PDF, filed in the schematic section yet most likely the transistor datasheet. In the JIS scheme 2SC identifies an NPN bipolar transistor, frequently stamped C5111 without the 2S. A separate FT-suffixed variant also exists in the index, so check which version is actually fitted before relying on the pinout. The sheet gives package drawings, maximum ratings and electrical characteristics needed to test the part and choose a correct equivalent.
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.