The code 240U060D in the name of this 193 KB PDF looks like a power semiconductor part number, so the document is most likely a datasheet rather than the schematic its category suggests. No manufacturer is named. Datasheets of this type list voltage class, current rating, recovery characteristics where relevant and case outline, all needed when replacing a high power diode. Open it in any PDF reader, and compare the exact marking on the original part, including letter suffixes, before relying on it.
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.