2SC5720 component documentation in PDF form, 156 KB, indexed as a schematic. The 2SC prefix in Japanese semiconductor numbering identifies an NPN transistor of the high-frequency class, which suggests this is the manufacturer datasheet. Open it with any PDF viewer to check pinout, electrical limits and typical curves before soldering in a replacement or cross-referencing an alternative. Since the name states no package or supplier, verify the marking code on the original device against the tables inside before swapping parts.
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.