Datasheet-style PDF for the 3SK264, roughly 82.2 KB, indexed as a schematic. The name contains only the type number. Under the Japanese JIS scheme, a 3SK part is a four-terminal N-channel FET, commonly a dual-gate MOSFET in RF front-end circuits. Technicians use such a document to read pin assignment, absolute maximum ratings, gain and noise characteristics, and package dimensions. Compare the marking printed on the component with the sheet before deciding on a replacement part.
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.