A 77.2 KB PDF named 1SS357, best read as the specification sheet of one small-signal silicon diode, which is what the JIS 1SS prefix denotes. No device model, board number or brand is given in the name. Technicians rely on such sheets to locate the cathode marking, check forward voltage and reverse rating, and judge whether a substitute part is acceptable. It opens in any PDF viewer. Compare the package outline and marking code with the component on the board before ordering.
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.