Covering the 2SK2459N, this 138 KB PDF sits in the schematic section but by its name is a transistor datasheet; 2SK is the Japanese JIS prefix for N-channel field-effect transistors. No maker or package appears in the file name, so read the document itself for those. A copy with a 1-5 suffix is also indexed. The sheet is useful for verifying pin assignment and ratings before replacing a shorted device, and for measuring a removed part with a meter in diode mode.
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.