Another 469 KB PDF from the 2SC48xx range, this one labelled 2SC4842. The 2SC prefix in JIS semiconductor numbering denotes an NPN bipolar transistor, so despite the schematic category it should be a datasheet; the name itself reveals nothing more. Engineers consult such documents to confirm lead order, maximum ratings and package outline before replacing a failed device. When the original is unavailable, choose an equivalent whose limits match or exceed those shown, after verifying the marking on the part.
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.