Reference PDF for the 2SB789 transistor, 42.5 KB in size. Under JIS naming, the 2SB prefix denotes a PNP transistor aimed at low-frequency use, and a file named only by part number is almost certainly a datasheet even though it is catalogued as a schematic. The _E suffix is not decoded by the name. Open it in any PDF viewer to look up pin order, package, absolute maximum ratings and hFE ranking when testing a suspect part or choosing a substitute.
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)