Datasheet PDF of 125 KB for the 2SC4854, placed under schematics in the index. Only the part number is given in the name. A 2SC designation under the JIS/JEITA system means an NPN bipolar transistor, so the content concerns one discrete device. It should list maximum ratings, hFE, characteristic curves and the case drawing. Check the package and pin numbering against the component on the board, then use the ratings to confirm any replacement can handle the circuit 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.