Panasonic UF-4100 - Manual (Page 106)

Troubleshooting
106
If document misfeeding occurs frequently, we suggest you adjust the ADF.
Adjusting the Automatic Document Feeder (ADF)
To adjust the ADF
1 Slide the Pressure Adjusting Lever to the
desired position depending on the condition.
Position Condition
To prevent no feed trouble
Standard position
To prevent multiple feed trouble
1
2
3