Indexed as a schematic, this 86.4 KB PDF is named after the 2SC3069 and most likely contains its datasheet. The JIS prefix 2SC identifies an NPN bipolar transistor in the high-frequency class. A technician would use the pinout diagram, package outline and maximum rating tables when testing the part or picking a cross-reference replacement. Gain classification data helps too where matching matters. Because the name gives no maker, compare the case marking carefully before substituting.
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.