The 2SK601 is the only information in the name of this 33.2 KB PDF, which is filed under schematics yet most likely contains a datasheet, as 2SK numbers designate N-channel FETs in the Japanese JIS system. Look for package outline, pinout and rating tables. Technicians use it to identify terminals, measure the device for shorts or leakage, and evaluate a substitute with equal or higher voltage and current ratings. Confirm the component marking matches before relying on the data.
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.