PDF for the 2SD2618, 46.6 KB, with a lowercase name and filed as a schematic. In practice, it should be a datasheet for this JIS-numbered NPN bipolar transistor, as the 2SD prefix denotes low-frequency NPN types. Use the ratings tables and outline drawing to confirm base, collector and emitter positions, to interpret diode-test readings and to select a substitute with sufficient margins. Cross-check the package against the board pads.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)