The 2SD592 NPN transistor is documented in this 50.3 KB PDF, which the catalogue lists as a schematic. The _E part of the name refers to a document edition rather than a different component. By JIS convention 2SD denotes a bipolar NPN device for low-frequency applications, and the printed marking may be shortened to D592. Any PDF reader opens it; use the electrical characteristics and lead diagram to pick a safe equivalent and avoid installing the part reversed.
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.