Datasheet-style document for the 1SS402 diode, indexed as a schematic. It is a 76.8 KB PDF whose name carries only the part number plus an underscore, with no device, board or brand information. The 1SS prefix marks a Japanese-registered small-signal diode. Look here for the pin arrangement, package dimensions and absolute maximum ratings when you test or replace a diode during board repair. Confirm the package type printed on the PCB footprint matches before ordering a replacement.
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.