Catalogued as a schematic, this 86 KB PDF is named only after the part number 2SK2273, so it is almost certainly a component datasheet, not a board diagram. Under the Japanese JIS/EIAJ numbering system the 2SK prefix marks an N-channel field-effect transistor. The name does not say who made it or what package it uses. Technicians use such sheets to read the pinout, voltage and current ratings and on-resistance before choosing a replacement. Check the marking on the failed part before you order 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.