Small 81.5 KB PDF named after the 2SA1724 part number and filed under schematics. Nothing else in the name identifies a product or circuit board. In the JIS system the 2SA code means a PNP bipolar transistor, so this is almost certainly a datasheet rather than a full diagram. Use it to look up the pinout, voltage and current limits and package style when diagnosing a stage built around this transistor, and confirm polarity and ratings before installing an alternative part taken from a substitution guide.
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.