Small 42.4 KB PDF for the 2SC2634, carrying an _E suffix that may mean an English edition, though the name does not state it. The 2SC code under JIS identifies an NPN transistor. It is catalogued as a schematic, but the expected content is a brief datasheet covering ratings and pinout. Technicians rely on such pages to confirm orientation and voltage and current limits and to pick replacement parts. Confirm that the marking on the component corresponds to this number.
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.