Part number 1SS181 gives this 70.1 KB PDF its name, and the index places it among schematics. Toshiba uses the 1SS prefix for small-signal switching diodes, so the document is best treated as a data sheet for that one component. It lets a technician match the printed marking on a tiny SMD package, see how the pins connect internally and check ratings. Those checks help before measuring the part in circuit or ordering a substitute. The name lists no variant, and any PDF program opens it.
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.