Datalogic Magellan 8500Xt Product Reference Manual page 137

Product Reference Guide
If the scanner/scale passes all these tests:
1. Remove the weigh platter, install the calibration switch cover and
install a seal (if required).
2. Reinstall the weigh platter.
If the scale fails any of these tests, turn to
follow the troubleshooting 
procedures for Scale Failures.
Section 4, Problem Isolation
and
6-19