PDF datasheet covering the 2SB1651 PNP transistor, 40 KB. The _E suffix most likely denotes an English edition of the manufacturer document, though the file name does not state the maker. The 2SB prefix comes from the JIS scheme and identifies a PNP low-frequency bipolar part. In repair work the sheet is used to read off the pin assignment, absolute maximum ratings, hFE classes and the top marking, so a failed device can be identified and an equivalent with matching package and ratings chosen.
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.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.