Filed under schematics, this 99.9 KB PDF is named for the 2SC3038 transistor and probably contains its datasheet. The JIS prefix 2SC designates an NPN bipolar device for high-frequency applications. When a transistor fails short or open, a document like this supplies the pinout, maximum ratings and gain classes needed to test it properly. The same data helps when picking a suitable replacement. The name lists no manufacturer, so verify the code printed on the component before using it.
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.