Component documentation for the 2SK1904, provided as a 95.2 KB PDF and filed as a schematic. A 2SK number is the Japanese designation for an N-channel FET, so expect specifications for one discrete transistor. It is handy when a FET in a power supply or driver stage measures shorted and you need its pinout, ratings and package outline to choose a correct substitute. Nothing beyond the part number is in the name, so check the device marking before relying on 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.