Carrying only the part number 2SC5030, this 212 KB PDF is categorised as a schematic, but the JIS 2SC prefix identifies an NPN transistor and the file is most likely its datasheet. Its size matches the 2SC5029 file, possibly a shared family document, which the name does not confirm. No maker or package is given. Use it for pinout, breakdown voltages, current rating and gain when testing the part or choosing an equivalent; it opens in any PDF viewer.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)