PDF of 41.0 KB for the 2SB873, with an _E suffix whose meaning the name does not explain. The 2SB prefix in Japanese JIS numbering marks a PNP transistor intended for low-frequency use. Small files of this kind are usually concise data sheets with ratings, gain classes and a pin diagram. Use it to identify leads before testing, to check whether the fitted part is within its limits, and to choose a substitute with matching package and polarity. Any standard PDF viewer opens it.
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.