The text is a stamp of material safety certification rather than a map of your motherboard's circuitry. By locating the true Dell Part Number (DP/N) or Foxconn motherboard engineering code from the internal barcodes, you can pivot your search toward the exact schematic and boardview files needed to successfully diagnose, trace, and repair your hardware.
The SFF Service Manual is the most common home for the E93839 board. dell e93839 motherboard schematic link
The last 4-5 alphanumeric characters after "E93839" are the actual motherboard variant code you need. For example, "LA0531" in "E93839-LA0531" indicates the schematic path for an OptiPlex 7010 motherboard. The text is a stamp of material safety