Short 23.7 KB PDF for the 2SK2014, a part number from the JIS 2SK series used for N-channel FETs. Listed as a schematic, it is really a single-component datasheet with ratings and pin information. Repair technicians use such a document to identify the gate, drain and source legs, check breakdown voltage and current capacity, and evaluate equivalents when the original is unavailable. The name gives only the part number, so make sure the marking and package on the board agree before ordering a replacement.
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.