Filed as a schematic, this 168 KB PDF is identified only by 20L15T. It gives no brand, model, board number or revision, so its exact subject is unclear from the name alone. The code style suggests a single part rather than a full board. It opens in a standard PDF viewer. After checking the contents, use it to confirm pin assignments and limits during in-circuit tests or when fitting a substitute. Always compare the identifier against the marking on the physical component first.
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.