A 126 KB PDF for the 2SC4871, given with only the part number and filed in the schematic section. The 2SC code belongs to the Japanese JIS scheme and denotes an NPN transistor, typically high-frequency, so the document is most likely a datasheet with ratings, characteristic graphs and package dimensions. Use it during repair to identify pins, test the junctions in the right orientation, and confirm that a substitute matches the original ratings. Check the component marking on the PCB before using it.
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.