Component documentation for the 2SK2920, a 409 KB PDF filed under schematics in this index but almost certainly a part datasheet. Under the Japanese JIS/JEITA registration system the 2SK prefix marks an N-channel field-effect transistor, and the name gives no other detail. A technician opens it in any PDF reader to check the pinout, package outline, voltage and current ratings and on-resistance before testing or replacing a suspect MOSFET. Compare the marking on the 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.