Component documentation for the 2SK1119, a part number in the Japanese 2SK series that designates N-channel field-effect transistors. Although catalogued as a schematic, a 395 KB PDF named after a single transistor is almost certainly a manufacturer datasheet. Technicians use such a sheet to confirm pinout, package, voltage and current ratings, on-resistance and gate threshold before replacing a failed MOSFET. It opens in any PDF reader. Check the marking on the actual part and compare ratings before fitting a substitute.
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.