Named 2SK2398, this 410 KB PDF appears in the schematic category yet reads as a transistor datasheet by its number; JIS codes beginning 2SK cover N-channel field-effect transistors. The name contains nothing further, so package and ratings must be confirmed inside. It is handy for verifying pinout before installation, reading drain-source voltage, drain current and on-resistance, and for cross-referencing an equivalent part. Make sure the marking on the component matches before trusting the data.
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.