The 2SC2073A, an A-suffixed variant of a JIS-numbered part, is covered by this 154 KB PDF listed as a schematic. The 2SC prefix marks an NPN bipolar transistor, so the document should be a datasheet with pinout, outline and electrical limits. Suffix letters often distinguish versions with different ratings, so make sure the part on the board reads 2SC2073A before trusting these figures. Technicians use it for in-circuit diagnosis, junction testing with a meter and selection of suitable equivalents.
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.