Canon 3245 Troubleshooting Manual page 192

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Clearing Paper Jams
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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.
Return the lower delivery guide to its original position.
Lower Delivery Guide