Schematic for the Quanta ZB1 motherboard, a 1.84 MB PDF with no revision given in the name. Quanta is an ODM, and ZB1 is its internal board code rather than a retail laptop name, so the brand of the finished machine may differ. Repair technicians read diagrams like this to check charger and standby circuits, trace rails that are missing or shorted, find pull-ups and test points on key signals, and confirm the reference designators of failed parts. Make sure the code on your PCB matches, and compare its revision if one is printed.
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 @smschematics. 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.