LED board schematic from the Stanford (ZHXS) project, RAMP release, in a 342 KB PDF. The name gives no brand or model, only the project codename. A small sheet like this usually documents an indicator or lighting daughterboard, letting you trace its supply, check the cable connection to the mainboard and find failed resistors or LEDs. Use it together with the main and USB board schematics of the same project. Any PDF reader opens it, but compare the board label and revision with your hardware first.
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.