A compact 32 KB PDF named 2SK1447LS, filed as a schematic. It appears to cover a variant of the 2SK1447 carrying an LS suffix, whose meaning the name does not explain. The 2SK prefix follows the JIS scheme for N-channel FETs, so this is probably a short data sheet or package-variant sheet. Use it to check pinout and ratings against the part on the board. Compare it with the full 2SK1447 sheet, and make sure the suffix printed on the device matches before substituting.
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.