Indexed as a schematic, this 73.7 KB PDF carries nothing but the part number 1SS349 in its name, with no device or board stated. The 1SS prefix is the JIS code for small-signal diodes, widely used by Toshiba, which suggests a single-component datasheet. It is useful when a diode near a power rail or signal line reads shorted and you need its ratings, package outline and marking to source a compatible replacement. Any PDF reader opens it, and the marking code should be compared with the chip on the board.
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.