Documentation for the 2SC4730 transistor, supplied as a 142 KB PDF file. It sits in the schematic category, yet the 2SC designation under Japanese JIS numbering marks an NPN bipolar part, so the document should be its datasheet. Nothing else is stated in the name. Use it to look up the package outline, pin layout and electrical limits, which helps when a failed device must be swapped for an equivalent. Always confirm the body marking on the PCB matches before relying on these figures.
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.