PDF of 137 KB for the 2SK2713, carrying a 1-5 suffix of unstated meaning, likely an edition or page marker rather than a different device. Although listed as a schematic, the 2SK prefix, the Japanese JIS code for N-channel FETs, shows it is a component datasheet. It provides the figures needed to check pinout, breakdown voltage, drain current and on-resistance when diagnosing a shorted switching stage or choosing a replacement. Confirm the part marking on the board 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.