For the 2SK3114, a 94.1 KB PDF supplies the component data, filed among the schematics. The 2SK prefix follows Japanese JEITA naming for N-channel field-effect transistors. Technicians use the sheet to read pinout and package outline, find voltage and current limits, and assess possible substitutes when the original is unavailable or has failed. No maker, package or revision is given in the name, so take those details directly from the document and compare with the board.
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.