Component datasheet for the 1N4936, filed under schematics and stored as a 45.5 KB PDF. The part belongs to the 1N4933 to 1N4937 fast recovery axial rectifier series and sits in the middle of the voltage range of the family. When a diode in a switch-mode supply or flyback stage fails short, this sheet confirms the ratings a substitute must meet, especially reverse recovery time, since a standard 1N400x is too slow there. Open it in any PDF reader and check the package dimensions against the board.
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.