Filed under schematics, this 98 KB PDF is named after the part number 2SC4671, which follows the Japanese JIS designation for an NPN bipolar transistor. A document named this way is most likely the manufacturer datasheet rather than a device circuit diagram, though the name alone does not confirm it. Technicians use such a sheet to check pinout, package, voltage and current ratings, gain and switching figures before choosing a substitute. Open it in any PDF reader and compare the marking on the failed part with the sheet.
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.