Datasheet PDF for the 2SK2889, 417 KB in size and indexed here under schematics. The name states nothing beyond the part number. According to Japanese semiconductor registration, 2SK parts are N-channel field-effect transistors. When a power supply blows or a rail is shorted, this kind of document lets you confirm the pinout, package dimensions and electrical limits, and pick a replacement with matching or better voltage, current and on-resistance figures. Any PDF reader opens it; match the device marking before use.
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.