The 2SK2854 transistor is documented in this 125 KB PDF, indexed under schematics but almost certainly a datasheet. The name states only the part number. Under JEITA conventions the 2SK prefix denotes an N-channel FET, used in switching supplies, inverters and load switches. The sheet gives the pin arrangement, absolute maximum ratings and electrical characteristics a technician needs for testing and substitution. Open it with any PDF reader, and make sure the code on the actual part matches before relying on the pinout or 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.