Covering the 1N5396 diode, this 42.7 KB PDF is a manufacturer datasheet rather than a board schematic, despite its category. It shares its size with the other 1N539x files here, pointing to a common series document. A technician would use it to confirm reverse voltage, average forward current, surge limits and package dimensions when a rectifier in a power section needs replacing. Open it with any PDF viewer, and before fitting a substitute make sure every rating is equal or better than the original part.
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.