A 135 KB PDF filed as a schematic and named 70cru02. Nothing in the name identifies a device, board maker or revision, and the difference from the related 70cru04 file is not stated. The code looks like a semiconductor designation, so the content is most likely a component reference sheet. Technicians use such sheets to check pin functions, package dimensions and maximum ratings during diagnosis. Any PDF viewer will open it. Match the printed code on the physical part before relying on its data.
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.