A schematic-category PDF of 223 KB named 20CTQ, without any device model, board number or revision in the name. The code looks like a component series designation, so the document likely covers part data rather than a full board circuit. Any PDF program can display it. Use it to check the pin configuration, such as how multiple elements share a common terminal, and the electrical limits before you test or replace a part. Match the full marking, including suffixes, on the original component.
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.