Datasheet PDF, 413 KB, referencing the 2SK2601, catalogued as a schematic. Per JIS semiconductor naming, the 2SK prefix denotes an N-channel FET; no other details such as package or manufacturer appear in the name. A technician would use it to identify pins, read drain-source voltage and continuous current ratings, and compare on-resistance when hunting for a replacement after a short in a power circuit. Check that the part marking and case outline on the board match the document.
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.