The 2SK2152 is covered by this 93 KB PDF, listed as a schematic but named only by its part number, so it is most likely the transistor's datasheet. The 2SK prefix is the Japanese registration for N-channel FETs. The name does not say who made it or what package it uses. Technicians use such sheets to check voltage and current limits, gate threshold and pin assignment, and to judge whether a substitute MOSFET will fit the circuit without overheating.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)