Reference sheet for the 1SS389, a 66.7 KB PDF indexed as a schematic. Nothing in the filename beyond the part number and an underscore identifies a device, brand or board revision. The 1SS designation is the Japanese registration series for small-signal silicon diodes, so expect datasheet content: package outline, marking, ratings and electrical characteristics. It is handy when you need to verify a diode-mode reading or confirm a replacement fits. Check the package and polarity against the PCB before installing.
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.