Listed as a schematic, this 103 KB PDF is titled with the device code 2SC4461. In the JIS semiconductor naming scheme, 2SC stands for an NPN bipolar transistor meant for high-frequency circuits, so expect a datasheet with electrical tables rather than a full circuit. No maker or package is mentioned in the name. Before swapping a failed part, compare the markings on the case, check lead order in the sheet, and confirm the substitute meets the rated collector voltage and current.
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.