Indexed as a schematic, this 68.4 KB PDF takes its name from the diode number 1SS372 and gives no device, board or brand information. Under JIS rules a 1SS part is a small-signal silicon diode, and the document should list its electrical characteristics, pin connection and package dimensions. Technicians use it when testing or replacing a diode that reads shorted in diode mode. Any PDF viewer will open it; check that the marking on the board component corresponds to this part before substituting.
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.