Labelled 2SK1451, this 111 KB PDF sits in the schematic section but by name looks like a transistor data sheet. The JIS 2SK code belongs to N-channel FETs. The name gives nothing on package, maker or revision, so any such detail has to come from the document itself. Practical uses include identifying pins before testing with a multimeter, reading on-resistance and gate threshold, and matching ratings when cross-referencing a substitute. Confirm the board part carries the same code.
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.