PDF document of 242 KB covering the 2SK246, a JIS-numbered N-channel field-effect transistor. It is indexed as a schematic, but the name points to a single-device datasheet rather than a product circuit diagram. Expect characteristic graphs, absolute maximum ratings and a package drawing with pin identification. Service technicians consult this when a stage built around the FET misbehaves, and before swapping parts they should verify any rank or grade suffix printed on the original.
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.