Xerox Versant 4100 Press Manual page 18

CORRECTIVE ACTION: Lower the feeder discharge such that the feed head is slightly lower than the
MSI reg wall. This can be done by turning the fluorescent "Do Not Adjust" knob on the INBOARD side
of the feeder counterclockwise. It is recommended that you make this change in small increments.
Lowering the feeder discharge correct feeder head setting
3-8 Xerox Customized Envelope Feeder – Problem Solving Guide