PDF for the 2SK1053 transistor, 107 KB, filed as a schematic but by its name a single-part datasheet. Devices numbered 2SK are N-channel field-effect transistors under the JIS scheme. The document should give absolute maximum ratings, electrical characteristics and the package outline, which help locate gate, drain and source and check whether a suspect device has failed. Readable in any PDF viewer. Match ratings and footprint precisely when choosing an equivalent, and test the surrounding gate driver too.
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.