Labelled as a schematic, this 111 KB PDF is identified only as 70cru04, without any brand, model or PCB revision. The code resembles a component part number, and a related 70cru02 file exists in the same set, so the two probably cover variants of one part family. Expect reference information such as pin layout and electrical ratings. It opens in a standard PDF reader. Confirm the part marking on the board before using the document to choose a replacement or interpret measurements.
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.