The 2SA1145 PNP transistor is documented in this 169 KB PDF. Its 2SA prefix follows the JIS standard for PNP bipolar semiconductors. That makes the file a datasheet in practice, even though it is catalogued as a schematic. Technicians use such sheets to locate base, collector and emitter leads, check case dimensions and compare absolute maximum ratings and hFE ranges with a candidate substitute. Before replacing, confirm the fault with diode-mode measurements across both junctions, observing PNP polarity.
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.