A small 51.5 KB PDF carrying the part number 2sc5147, catalogued as a schematic but almost certainly a component datasheet for that NPN transistor. JIS numbering uses 2SC for NPN bipolar devices aimed at high-frequency work, and the name gives no maker or package. On the bench, a datasheet like this helps you identify the base, collector and emitter leads, check voltage and current limits and pick a suitable equivalent. Confirm the printed marking on the failed part matches before relying on it, since short codes are often reused.
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.