PDF schematic of an ATX computer power supply with power factor correction, 243 KB. No manufacturer or model is given in the name, so it serves as a typical reference design rather than a board-specific drawing. It is useful for understanding the PFC boost stage, the main switching converter, standby supply and PWM supervisor that drive the 3.3 V, 5 V and 12 V rails. Discharge the bulk capacitor before probing, and compare part numbers with the unit on the bench since real supplies differ in detail.
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 @nityatechnology2020. 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.