The 2SK2395 is covered in a compact 96.5 KB PDF, classified as a schematic but most likely a component datasheet. In the Japanese JIS system a 2SK prefix denotes an N-channel FET. Neither maker nor package is stated in the name. Any PDF viewer will open it, and the content is useful for confirming lead order, maximum voltage and current, and switching behaviour when diagnosing a failed transistor or selecting a replacement with equal or better ratings for the same circuit.
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.