Datasheet for the 2SA1801 transistor in PDF format, roughly 123 KB. JIS part numbering uses the 2SA prefix for PNP bipolar transistors, so the sheet should contain collector and emitter voltage limits, current and dissipation ratings, gain ranges and a package drawing. It assists when diagnosing a shorted or open junction, tracing which lead goes where on the PCB, or sourcing a substitute part. Confirm that the package and marking on the board correspond to this datasheet first.
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.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.