PDF of 41.0 KB for the 2SD1821, with an E suffix in the name whose meaning is not stated. Although filed as a schematic, the part number indicates a datasheet for a JIS-coded transistor; 2SD denotes NPN low-frequency bipolar. Expect absolute maximum ratings, electrical characteristics and a package outline. Use these to verify lead order and to make sure any substitute meets the voltage, current and dissipation limits of the original.
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)