Small 42 KB PDF for the 2SC3077, filed as a schematic. The trailing _E in the name is not explained by the file name itself. The 2SC prefix follows the JIS system for NPN bipolar transistors intended for high-frequency use. A datasheet like this is handy for confirming emitter, base and collector pins and for checking voltage and current ceilings. It also helps when comparing gain classes against a candidate substitute. Verify the printed code on the component before relying on these figures.
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.