The 2SK2740 transistor is the subject of this 143 KB PDF, filed as a schematic even though the name points to a component datasheet. In JIS numbering 2SK stands for an N-channel FET, so look for maximum ratings, electrical tables and the package drawing. Another copy carrying a 1-5 suffix is indexed as well and may be a different edition. Technicians use this information to confirm gate, drain and source before measuring and to select a replacement with matching or higher ratings.
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.