For the 2SK2744 this 177 KB PDF provides component-level reference material, although the index lists it among schematics. Following JIS convention, 2SK marks an N-channel FET, so the pages likely cover ratings, characteristics and the package outline. Technicians open such files to confirm pinout before testing in diode mode, to check maximum drain-source voltage and current, and to pick an equivalent when the original is unavailable. Read it in any PDF viewer and confirm the part marking matches before relying on it.
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.