A 107 KB PDF titled with the lowercase part number 2sd1565, catalogued as a schematic yet almost certainly a transistor datasheet. The JIS 2SD prefix signifies an NPN transistor for low-frequency applications. Open it with any PDF viewer to check pinout, outline dimensions, breakdown voltages and current capability, which helps when measuring junctions with a multimeter or picking an alternative part. Expect the physical device to carry the shortened marking D1565 rather than the full designation.
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.