Compact PDF of 48.2 KB named after the 2SC3315 part number, catalogued as a schematic but most likely a datasheet for that discrete transistor. Under the Japanese JIS scheme a 2SC prefix marks an NPN transistor. The _E suffix often marks an English-language edition, though the name does not confirm it. Use it to check pinout, package outline and maximum ratings before fitting a replacement, and compare the marking on the part with the number printed in the document.
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.