Lowercase-named PDF, 71.1 KB, for the 2SD2212. It is listed as a schematic, but its content should be a component datasheet for this JIS-numbered part. The 2SD prefix marks an NPN low-frequency bipolar transistor. Use it to identify the terminals, check breakdown and saturation figures, and compare power ratings when hunting for a replacement. Confirm the abbreviated marking on the body, often D2212, and the package before soldering a new 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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)