Reference document for the 2SA1730 transistor in PDF form, 97.6 KB in size. Only the part number appears in the name, so no specific equipment can be tied to it. Japanese JIS naming assigns the 2SA prefix to PNP bipolar transistors, and a file like this is generally the manufacturer's specification sheet with pin assignment, limits and characteristic curves. It helps when identifying a component on a board, testing it out of circuit, or evaluating whether an equivalent PNP part with similar voltage, current and gain can be fitted safely.
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.