Component reference for 2SA2037, provided as a 37.8 KB PDF. The JIS 2SA designation identifies a PNP bipolar transistor, so the content is expected to be a datasheet rather than a device schematic, though the name alone cannot confirm that. No package or manufacturer is stated. Before replacing the part, compare the package drawing and pin order with the PCB footprint, and make sure the voltage, current and dissipation limits of any alternative are at least equal to those listed.
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.