Covering the 2SA1407, this 108 KB PDF is a part reference stored in the schematic category. In JIS numbering the 2SA series identifies PNP transistors designed for high-frequency circuits. The name provides nothing beyond the part number. Before replacing the device, check the sheet for lead configuration and package outline, read the maximum collector voltage and current, and compare against any proposed equivalent, since second-source parts may differ in pinout or gain grading.
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.