Named for the 2SK1445, this 108 KB PDF falls under the schematic category but most likely contains the full transistor data sheet. In JIS numbering, 2SK marks an N-channel field-effect transistor. Ratings tables, characteristic curves and outline drawings are the usual contents. They are handy for in-circuit diagnosis of a suspected short and for selecting a replacement with matching or higher limits. An LS-suffixed variant also exists, so check the exact code printed on the fitted part.
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.