Part number 1SS196 gives this 68.1 KB PDF its name, which marks it as a datasheet for a single semiconductor rather than a full circuit diagram. In JIS numbering, 1SS designates small-signal diodes used for switching and signal duties. The document should give electrical limits, typical curves and a package drawing. During repair it helps verify orientation, decode the SMD marking and compare a meter reading with expected forward voltage. Any PDF viewer works, and the footprint should be checked against the drawing before soldering.
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.