The 2SK2530 is covered by this 42.5 KB PDF document, catalogued under schematics. According to Japanese JIS numbering, 2SK marks an N-channel field-effect transistor, and the name states nothing further about manufacturer or package. Open it in any PDF viewer to get pin assignments, maximum drain-source voltage and current, and characteristic curves. These figures help decide whether an alternative part is safe to fit. Confirm the original body marking matches before working from this sheet.
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.