Short 37.3 KB PDF for the 2SK544, a part number belonging to the JIS 2SK series of N-channel FETs; although indexed as a schematic, it should be a component datasheet. The file name contains nothing else, such as maker or package. Use the pinout and ratings to orient the device correctly, check it for shorts with a meter, and compare voltage and current figures when a replacement is needed. Any PDF viewer displays it, and the printed marking on the part should match.
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.