The 42.4 KB PDF is named for the 2SD2345 and carries an _E suffix, whose meaning the name does not explain. Under the Japanese JIS system the 2SD designation belongs to NPN transistors for low-frequency service, so expect a datasheet rather than a board diagram. Use it to read the pinout and the maximum collector voltage and current, and to compare gain grades when picking a replacement. Readable in any PDF viewer. Always cross-check the package outline with the footprint before fitting a substitute part.
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.