A 111 KB PDF for the 2SK1453, placed among schematics, although the part-number naming points to a component data sheet. In the JIS standard, 2SK identifies N-channel FETs, typically switching or amplifier transistors. Use the document to confirm pinout, voltage rating, current capability and gate drive requirements during fault finding or replacement. No maker or package is given in the name. Verify that the code printed on the device matches before relying on the published limits.
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.