PDF schematic for the Gigabyte GA-P55M-UD2 desktop board, labelled revision 1.0 in the name. It sits alongside the 1.0B and 1.1B documents for the same micro-ATX Intel P55 platform. Technicians rely on such drawings to trace the VRM phases, the DDR3 and chipset supplies, the USB and SATA power, and the signals that control the power-on sequence. Any standard PDF reader displays the pages. Compare this file with the other revisions if your board's marking is unclear, since small circuit changes between them are common.
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 @afsschematicfree. 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.