Canon Color ImageRunner C3380 Reference Manual page 470

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Clearing Paper Jams
While pushing in the larger knob on the left, turn it in the
direction of the arrow (clockwise).
Remove any jammed paper protruding from the saddle
stitcher unit.
Tilt the lower delivery guide to the right, and remove any
jammed paper.
Turn the lever on the lower delivery guide to the right until it stops, and then tilt
the lower delivery guide to the right.
Lower Delivery Guide