Reference PDF, 88.0 KB, for the 2SA1582 transistor. The file name states only the part number and nothing about the maker, package or application. In the JIS system, 2SA denotes a PNP bipolar transistor of the high-frequency class. A technician would consult it for absolute maximum ratings, gain values and lead arrangement when testing or replacing the part. Packages with the same body can have different pin orders, so check the drawing against the board footprint and the marking on the original device.
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.