Datasheet PDF for the 2SK1472 N-channel field-effect transistor, inferred from the Japanese 2SK designation, though the catalogue files it under schematics. At 119 KB it likely covers maximum ratings, electrical characteristics and the package outline. On the bench this is the reference for locating gate, drain and source, checking whether measured behaviour is within spec and comparing alternatives when the original is unavailable. Match the code on the actual component body before relying on these values for a repair.
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.