The 185NQ015 named here is a Schottky rectifier part code, and the 015 suffix typically signals a very low 15 V reverse rating suited to low-voltage, high-current outputs. The 97.5 KB PDF should hold ratings, curves and an outline drawing rather than a board schematic. It is handy when checking whether a replacement diode can handle the current and leakage of the original in a power supply. Confirm the marking and package of the removed part before relying on any 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.