Only 29.3 KB, this PDF named 2SK2380 sits under schematics but is most likely a brief datasheet for an N-channel FET, per the Japanese JIS 2SK prefix. Package, manufacturer and ratings are not given in the name. A short sheet like this usually still lists pin assignment and key limits. Technicians consult it to confirm orientation before fitting a replacement and to compare voltage and current ratings with any alternative transistor they plan to use in the circuit.
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.