The 2SK545 is covered by this 80.4 KB PDF, filed as a schematic but most likely a datasheet because 2SK numbers identify N-channel field-effect transistors in the Japanese JIS scheme. Expect package drawings, pin assignment, maximum ratings and characteristic graphs. It serves repair work by confirming terminal layout, guiding out-of-circuit testing and helping choose a cross-reference part with compatible polarity, package and ratings. No further details are given in the name, so verify the component marking first and open it with any PDF reader.
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.