The 2SK1867 is named in this small 33.9 KB PDF, catalogued under schematics. Because 2SK is the Japanese prefix for N-channel field-effect transistors, expect a brief datasheet rather than a circuit drawing. It is useful for identifying gate, drain and source and for reading maximum ratings when a FET has failed and a replacement must be matched. The file name gives no manufacturer or package, so check the printed code on the component before relying on the values.
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.