Part documentation for the 2SA1683, supplied as a 138 KB PDF and filed in the schematic category, though its naming follows the datasheet pattern. The JIS prefix 2SA marks a PNP transistor for high-frequency applications. Nothing beyond the part number is stated. Expect absolute maximum ratings, electrical characteristics and a package outline; use them to identify pins, test the device in circuit, and assess a replacement, always confirming the body marking on the board 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.