This 72.3 KB PDF is named 1SS361F, a JIS-style small-signal silicon diode number with an added F suffix; the name does not explain the suffix, so check the document for how it differs from the plain 1SS361 part. Expect ratings, pinout and package outline rather than a device schematic. Technicians use it to confirm polarity and pick an exact replacement. Open it in any PDF reader and match the suffix, marking and package on the board before substituting a variant.
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.