A 136 KB PDF for the 2SC4616, listed among schematics though the name only carries a component part number, implying a transistor datasheet. Japanese JIS designations starting with 2SC refer to NPN transistors intended for high-frequency use. The document should give pin layout, ratings, characteristic curves and package dimensions. Rely on it to identify leads before diode-mode checks and to judge whether a replacement can handle the same voltage, current and power, after confirming the marking on the board.
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.