Compact 30.7 KB PDF for the 2SK2593, filed as a schematic though the lowercase name is simply a semiconductor part number. The 2SK prefix in the JIS system marks an N-channel field-effect transistor. Given the small size, this is likely a brief datasheet of a page or two, focused on pinout and key ratings. Use it to identify gate, drain and source and check voltage and current limits when testing or replacing the part, after confirming the marking on the component matches.
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.