PDF of 49.6 KB named 2SC5565, catalogued with the schematics although it refers to a single semiconductor. The 2SC prefix in the Japanese JIS/JEITA scheme designates an NPN high-frequency transistor, so this is most likely a datasheet listing ratings, characteristics and package outline. Repair work uses it to identify leads, judge in-circuit measurements and select an equivalent with adequate voltage and current margins. Check the SMD marking on the board before treating the part as a match.
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.