Transistor reference for the 2SK2543, supplied as a 410 KB PDF and filed under schematics. Its 2SK prefix places it among N-channel field-effect transistors in the JIS designation system, though manufacturer and package are not stated in the name. Use the document to identify gate, drain and source, review absolute maximum ratings and compare characteristics against a candidate substitute. Package outline drawings in such sheets also help confirm that a replacement footprint will fit 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.