Indexed under schematics, this 106 KB PDF is named only 30BQ060, a code that looks like a discrete component part number, so expect datasheet-style pages rather than a full board diagram. No device, brand or revision is given in the name. On a repair bench a document like this helps identify a suspect part found on a power circuit, confirm its pin orientation and package, and pick a suitable replacement. Read the body marking on the PCB carefully and match it to the document before ordering a substitute.
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.