The 2SA1022 transistor is described in this 38.2 KB PDF, whose name includes an _E suffix; it is filed in the schematic category. The 2SA prefix designates a PNP bipolar transistor under Japan's JIS system. Only the part number appears in the name, so consult the document for package and manufacturer. It serves to confirm polarity and pin layout before installing a part, and to check that any substitute offers comparable breakdown voltage and current capability.
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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