Datasheet in PDF format for the 2SK615, filed as a schematic and sized at 34.3 KB. The 2SK prefix follows the Japanese JIS convention for N-channel FETs, so the content concerns one discrete transistor. Expect a pin diagram, ratings table and electrical characteristics. Repair use includes confirming gate, drain and source positions, checking whether a failed device exceeded its limits, and matching a replacement by polarity, package and ratings. Make sure the marking on the actual component corresponds to this number.
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.