Datasheet-style PDF of 414 KB for the 2SK2916, catalogued here as a schematic. The name gives nothing but the part number; 2SK designates an N-channel field-effect transistor under the Japanese JIS/JEITA naming convention. Technicians consult this kind of document when measuring a suspect transistor in circuit, confirming which leg is the gate, and finding a substitute with equal or higher voltage and current ratings and a compatible package. Make sure the printed code on the component matches before relying on the pinout shown.
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.