PDF schematic of 972 KB titled PLATINUM with SCH 2.2.11 in its name, most likely a schematic numbered or versioned 2.2.11, although the device type and maker are not given. Circuit diagrams of this kind are read to follow power and signal paths, confirm component values and measure against reference points while troubleshooting. Any PDF viewer opens it. Because the name is vague, compare the model label, the PCB silkscreen and the main IC numbers on your unit with the drawing before using it as a repair reference.
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 @pdf_servicemanual. 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.