Datasheet-style PDF for the 2SK1734, filed in the index under schematics though the name points to a single discrete part. The 2SK prefix comes from the Japanese JIS/JEITA numbering system and marks an N-channel field-effect transistor. The name gives no maker, package or ratings, so read those from the document. Use it to confirm the pinout and maximum voltage and current before replacing a shorted or open MOSFET, and compare the marking on the original part with the PDF before ordering 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.