The name 2SA2025 on this 38.7 KB PDF is a JIS transistor number; the 2SA prefix means a PNP bipolar device. Although tagged as a schematic, the file is most likely a short datasheet with ratings and a package outline, and the name tells nothing about maker or variant. In repair work it serves to identify emitter, base and collector for diode-mode testing, to read hFE and saturation figures, and to judge whether a cross-referenced part can stand in safely.
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.
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