Datasheet PDF for the base 2SC5417, 45.9 KB, filed in the schematic section; a separate LS-suffixed variant exists in the same set. The JIS prefix 2SC indicates an NPN transistor, most often a high-frequency type. The document should give pin assignment, ratings, electrical characteristics and package dimensions. Technicians check it to confirm lead order, compare limits against a substitute and identify the package. Because variants may differ in outline, confirm the full part marking before relying on the pinout.
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.