Small 120 KB PDF that, judging by its Persian title, is a saved Wikipedia encyclopedia article about inverters rather than a board-level schematic. It names no device, board number or brand. The page may give useful background on how inverter circuits convert DC to AC, which helps when servicing backlight inverters, power supplies or UPS units. Do not expect component designators, net names or test points. For real fault tracing, use the schematic of the specific board being repaired.
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 @schematic_mobile5. 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.