Named only 1SS301, this 67.0 KB PDF offers no device, board or revision information. The prefix follows the Japanese JIS designation for small-signal diodes, a family Toshiba produces in quantity, pointing to a component datasheet filed as a schematic. Repair technicians use it to check pinout, package dimensions, marking and maximum ratings when a diode reads shorted or open. Any PDF reader opens it; confirm the board part carries the matching marking before swapping in a substitute.
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.