Part 2SK2162 is the only detail in the name of this 132 KB PDF, which the index files as a schematic though it is most likely a datasheet. JIS/EIAJ numbering gives the 2SK prefix to N-channel field-effect transistors; brand and case style are not stated. A technician consults such a sheet for terminal layout, breakdown voltage, drain current and on-resistance. Those values let a failed FET be replaced with a correctly rated part rather than a guess.
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)