This 46.4 KB PDF named 16SYQ045C is filed as a schematic, but it refers to a component code rather than a board, with no model, board number or revision stated. The code follows the International Rectifier style for Schottky rectifiers, so the document is most likely a datasheet showing electrical limits, characteristic curves and the case outline. Use it when sourcing an equivalent for a failed diode in a supply circuit, and match the marking, pinout and package on the original part first.
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.