Indexed as a schematic, this 195 KB PDF carries just the type number 2SC3803. In JIS semiconductor naming, 2SC stands for an NPN transistor, so the content is most likely the device datasheet rather than a circuit diagram, and the name says nothing about the maker or case style. Such sheets help when measuring a suspect transistor, confirming lead order on a board or selecting a substitute with equal or higher voltage, current and power ratings. Confirm the printed marking on the component matches before swapping.
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.