PDF for the 2SK2463 carrying a _1-5 suffix, 136 KB in size; the name does not explain the suffix, which may refer to pages or an edition of the document. The 2SK prefix marks an N-channel FET under the JIS naming scheme, with maker and package unstated. Use the sheet to identify leads, review drain-source voltage and current limits and check whether a substitute part is adequate. Verify the code printed on the original transistor before relying on these figures.
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.