The MP72 includes an LED display inside the scanner vertical window that provides status and troubleshooting information, as well as scale legal parameters during calibration (for configurations with a scale).
The LED display scrolls letter(s) and number(s) one character at a time to indicate status, warning, and error information. When a message completes, the display pauses for two seconds and repeats the sequence continuously.
See
Scale Calibration (for scale configurations) for detailed calibration information, including errors and warnings.