Quanta R23 schematic, a 904 KB PDF. Beyond the project code, the name gives no brand, model, board number or revision, so the board must be identified from its silkscreen before use. Opened in any PDF viewer, the pages let a technician search nets, trace power rails and sequencing, check component values and narrow down a short circuit. Quanta is a contract ODM whose board numbers normally follow a DA-prefixed pattern containing the project code, which is the easiest way to confirm that R23 applies to your board.
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 @pepeelectronica. 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.