Datasheet-style PDF, 38.3 KB, for the 2SC2631 transistor; the _E suffix may point to an English edition, though the name does not confirm it. Per the Japanese JIS standard, 2SC identifies NPN bipolar transistors. No maker or package is stated in the name. A repair technician would use the document to confirm emitter, base and collector pins and voltage and current limits, and to judge equivalents. Check the component marking against the number 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.