Filed under schematics, this 138 KB PDF is named after the 2SK2463, a JIS-style part number, so it is most likely a component datasheet rather than a board drawing. The 2SK prefix is the Japanese designation for N-channel field-effect transistors. The name gives no manufacturer, package or ratings, so check those inside. Technicians use such sheets for pinout, drain-source voltage, current and on-resistance when choosing a substitute for a failed power stage. Any PDF viewer opens 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.