The name 2SK1446LS marks this 32 KB PDF as covering an LS-suffixed version of the 2SK1446. The name does not explain the suffix, which may denote a package or grade variant. It is filed as a schematic, but a JIS 2SK number identifies an N-channel FET, so a brief data sheet is the likely content. It helps when verifying lead order and key limits on a board. Read the full marking on the component and compare it with the standard 2SK1446 document before choosing a replacement.
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.