This 39.4 KB PDF is labelled 2SC4656 with an E suffix. The E most likely marks an English edition from a Japanese maker, but the name does not say so outright. The part number follows the JIS scheme for NPN transistors, and the file is probably its datasheet rather than a circuit diagram. At this small size it likely covers ratings, characteristics and the outline drawing. Check the pinout and marking against the part on the board before fitting a substitute, and confirm the package matches.
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.