Part code 1N758A is all the name provides; it matches JEDEC diode numbering with an A suffix, pointing to a component datasheet of 50.3 KB rather than a board schematic. Neighbouring files cover 1N756A, 1N757A and 1N759A at the identical size. Datasheets like this are consulted to confirm a part value, its tolerance grade and outline before swapping it on a board. View it in any PDF reader, and compare against the actual body marking, since one digit separates several different types.
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.