Short 41.2 KB PDF for the 2SA838, with an _E suffix that may indicate an English edition of the datasheet, although the name alone cannot confirm this. The JIS prefix 2SA designates a PNP bipolar transistor; no equipment model or board number is attached. Expect a single page or two of ratings, characteristics and an outline. Technicians use it to identify leads, check limits before substitution and confirm that a replacement PNP part with a similar gain and frequency range will behave correctly in the original circuit.
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.