The 2SC4867 is documented in this 127 KB PDF, which sits in the schematic category. No board, model or revision appears in the name. A 2SC number in the Japanese JIS/JEITA system indicates an NPN bipolar transistor, so the content should be a part datasheet. Open it with any PDF reader to check the pinout, limits on voltage, current and dissipation, and typical gain. Compare the marking and package with the part fitted on the board before trusting the data for a repair.
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.