Catalogued as a schematic, this 127 KB PDF carries only the designation 2SC3466 in its name. The 2SC prefix belongs to the Japanese JIS registration scheme and denotes an NPN bipolar transistor, so expect a component datasheet rather than a circuit diagram. On the bench it helps with verifying pin assignment, reading collector-emitter voltage and current limits, and judging whether a cross-reference part is suitable. Bodies usually show just C3466, so match the printed code and any rank letter carefully.
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.