Datasheet-type PDF for the 2SC4787, a JIS-numbered NPN transistor, filed in the schematic category. The _E suffix most likely denotes the English edition, and the 44.8 KB size points to a short specification sheet. Open it in any PDF viewer to read the absolute maximum ratings, electrical characteristics and package outline. When a transistor of this number fails, the sheet lets you confirm pin order and pick an equivalent with equal or higher ratings. Confirm the marking on the original part first.
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.