Larger 225 KB PDF for the 2SK436, indexed as a schematic yet most likely a full datasheet with graphs and package dimensions, since 2SK numbers denote N-channel FETs under Japanese JIS rules. The file name states only the part number. Technicians use such a sheet to confirm gate, drain and source pins, read maximum voltage, current and dissipation, test a suspect device out of circuit, and pick a cross-reference replacement. Verify the component marking and package match before trusting the data.
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.