Datasheet-type PDF for the 2SK2103, about 128 KB, listed under schematics. Under the JIS scheme the 2SK prefix denotes an N-channel field-effect transistor. The name gives no maker or package. A separate variant carrying a 1-5 suffix is catalogued at almost the same size and may be another copy or revision. The document helps identify gate, drain and source, check voltage and current limits, and assess possible replacements when the original MOSFET has failed.
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.