Schematic in PDF format for the Mac mini Mid 2011, model A1347, logic board 820-3059 including the 820-3059-A designation. Apple identifies its boards with 820 part numbers, which should be checked against the PCB before relying on the drawings. The document shows power rails, SMC circuitry, signal paths and part references, useful for tracing no-power faults or finding a short. Combine it with a matching boardview to locate components physically, and open it in any standard PDF reader.
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 @vinafix_bios. 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.