Fujitsu 3091DC Operation Manual page 37

2.4 Setting up the Stacker, Paper Stop and Document
Support
Extend the paper stacker and raise paper stop according to the document
size as follows:
1) Hold the tab of the stacker and pull.
Tab
2) Insert a finger into the indentation at the back of the stacker, then lift
the paper stop and swing forward.
M3091DC Image Scanner Operation Guide