Schematic PDF for PS-5161-1D1S, a code in the style of a power supply model, 1.15 MB in size. The name gives no brand, so check the label on the unit to confirm it matches. A power supply schematic helps trace the primary and secondary stages, the PWM controller, feedback optocoupler and standby circuit when the unit is dead or a fuse has blown. Opens in any PDF reader. Discharge the primary capacitors before probing a mains-powered supply.
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.