Compact 27.9 KB PDF datasheet for the 2SA1812 transistor, indexed under schematics. In JIS nomenclature, 2SA marks a PNP bipolar transistor, so this sheet should describe its ratings, gain classes and physical package. It helps when tracing a failed stage on a board, testing junctions with a multimeter in diode mode, or picking a replacement with equal or higher voltage and current limits. Make sure the pin order shown matches the footprint before fitting any alternative part.
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.