The 2SK2995 is the subject of this 418 KB PDF, filed among schematics but by its name a transistor datasheet. Parts numbered 2SK are N-channel FETs under the Japanese JIS naming convention. Typical use on the bench is checking absolute maximum ratings, thermal limits and the pinout when diagnosing a failed switching stage or hunting for a cross-reference. Always confirm the part printed on the device matches this number, as similar codes may describe very different ratings.
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.