Part 2SC5095 gives this 296 KB PDF its name, and that is the only detail available: no board, revision or manufacturer is stated. Following the Japanese JEITA scheme, 2SC identifies an NPN bipolar transistor, so the document is most likely its datasheet with electrical limits and package drawings. Repair work benefits from such a sheet when confirming base, collector and emitter positions, interpreting meter readings on a suspected failed device, or checking that an equivalent part has adequate ratings.
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.