Listed as a schematic, this 315 KB PDF carries the code 20CLQ045 and nothing else: no device, board number or revision. The structure resembles a semiconductor part number with a numeric suffix that may encode a rating. Open it in a standard PDF reader. Technicians use this kind of sheet to look up forward and reverse limits, pin layout and package size when checking a suspected short or choosing a replacement. Verify the exact code on the part before you rely on the 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.