Identified by part number 2SC5065 alone, this 467 KB PDF is catalogued as a schematic. The 2SC prefix marks an NPN transistor in the Japanese JIS system, so the file is effectively a component datasheet. Its size equals the 2SC5066 file, hinting at a common document for a family, though the name does not say so. Read the pinout, breakdown voltages, current rating and gain before replacing the device, and verify the marking on the original part matches.
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)