Compact 36.0 KB PDF covering the 2SC5244, listed as a schematic though the file name matches a single semiconductor part number. In Japanese JIS numbering, 2SC denotes an NPN bipolar transistor. The name gives no package, maker or revision details, so the document itself must be checked for those. Typical use is verifying absolute maximum ratings, hFE classes and the pin assignment when swapping a damaged transistor. It also helps you choose an equivalent with equal or better voltage and power margins.
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.