Covering the 6A05 to 6A10 series, this 198 KB PDF appears to be a datasheet for a family of 6 A rectifier diodes rather than a device schematic. The suffix numbers in such ranges normally step through reverse voltage grades, so the document should tabulate each variant side by side. Technicians use it to confirm surge current, forward drop and lead spacing when swapping a burned diode on a supply board. Open it in a standard PDF reader and compare the printed code on the part before fitting a replacement.
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.