Covering the 2SC4709, this 99.5 KB PDF is labelled a schematic but named for a single component. JIS numbering assigns the 2SC prefix to NPN bipolar transistors, so the file almost certainly holds the datasheet with electrical characteristics and package drawings. No other information is encoded in the name. Repair work uses it for pin identification, comparing measured junction behaviour with expectations, and checking that a replacement matches the original ratings and footprint.
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.