Covering the 2SK1459LS, this 31.9 KB PDF relates to an N-channel FET under JIS numbering, with an LS suffix setting it apart from the standard 2SK1459 sheet. Variants with suffixes can differ in package or characteristics, so do not assume they are interchangeable without comparing data. Indexed as a schematic, it is realistically a short datasheet. Use it to check pin layout and ratings before replacing the part, and read the complete marking on the component first.
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.