A 110 KB PDF titled 4GBU series, filed under schematics without any board number, revision or device. GBU is a common package designation for single-phase bridge rectifiers, and the 4 prefix typically indicates the current class, so expect a family sheet covering several voltage grades. Open it in any PDF reader. It helps when testing a bridge in a power supply with a meter in diode mode or choosing a replacement; read the full code on the part to select the right voltage grade.
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.