Catalogued as a schematic, the 1SR139 document comes as a 117 KB PDF whose name mentions 400 and 600 variants, so it likely covers two grades of one discrete part. Nothing in the title points to a device, board number or revision. It serves best as a lookup sheet when identifying a component, reading its polarity and limits, or choosing an equivalent during a power-circuit repair. Open it with any PDF reader and match the stamped code on the part against the variant listed before use.
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.