Component documentation for the 2SB745 transistor, supplied as a 55.4 KB PDF; the trailing _E in the name is not explained. In JIS part numbering, 2SB indicates a PNP device designed for low-frequency applications. A sheet of this type normally lists pinout, package dimensions, maximum ratings and characteristic curves. Before replacing a suspected faulty transistor, compare its body marking and package with the drawing, and verify the base, collector and emitter positions so the new part goes in correctly.
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.