PDF of 137 KB for the 2SK2793, with a 1-5 suffix in the name whose meaning is not explained; it may indicate a page range or document version. Filed as a schematic, it is most likely the datasheet for this JIS-named N-channel FET. A technician uses it to confirm terminals, read voltage and current ratings and assess substitutes. A second, similarly sized copy without the suffix exists, so compare both. Check the full marking on the actual part before relying on either.
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.