A 32.0 KB PDF covering the 2SK3415LS transistor, catalogued as a schematic though it reads as a part datasheet. Under JEITA naming, 2SK marks an N-channel FET. The LS suffix is part of the part number and usually denotes a package or lead variant, so check it against the document rather than assuming it matches the plain type. Use the sheet to identify gate, drain and source pins, check maximum ratings and choose an equivalent when the original has failed short.
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.