Filed as a schematic, this 412 KB document named 2SK2229 most likely contains the datasheet for that Japanese-numbered N-channel FET. In the JIS/EIAJ scheme, 2SK indicates this transistor type; the name does not state manufacturer or package. Open it in a standard PDF reader to check gate, drain and source positions and rated drain-source voltage. Also note the on-resistance figures, which a replacement should equal or beat. Match the printed marking on the board part with the sheet first.
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.