The 2SK2963 is covered by this 323 KB PDF, named only by part number. That 2SK prefix follows the JIS convention for N-channel field-effect transistors, pointing to a datasheet with ratings, characteristic graphs and outline drawings. When replacing a blown MOSFET, a technician checks these values against candidate substitutes and confirms which pin is gate, drain and source. Make sure the physical component on the board carries this same code 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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)