Transistor number 2SC4824 is all the name of this 141 KB PDF reveals; the index places it among schematics. The 2SC prefix follows Japanese JIS naming for NPN bipolar transistors, pointing to a datasheet rather than a circuit diagram, with manufacturer and package unstated. Use it to confirm base, collector and emitter positions, read voltage and current ceilings and assess substitutes when the original fails. Check the marking on the physical part before relying on the document for a replacement.
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.