At 31.1 KB, this compact PDF for the 2SC4976 is filed as a schematic, though the part-number name indicates a component sheet. Japanese JIS/JEITA numbering uses 2SC for NPN bipolar transistors, so the content should be a short datasheet with ratings, characteristics and a package outline. For repair work it is mainly useful to identify pins, read voltage and current limits, and compare a replacement candidate. Match the marking code and case on the board before relying on the data.
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.