At 98.9 KB, this PDF is named after the device 1SS364, indexed under schematics but most probably a diode data sheet. JIS numbering uses 1SS for small-signal silicon diodes, and such a sheet normally includes characteristic curves, ratings, pin connection and package dimensions. In repair it serves for confirming polarity and choosing a suitable replacement after a diode tests open or shorted. Open it with any PDF viewer, and compare the outline and marking with the original part on the PCB.
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.