Canon iR3245 Troubleshooting Manual page 210

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If necessary, make sure to remove all of the paper in the Booklet tray before clearing a staple jam inside the saddle
stitcher unit.
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This procedure is necessary only if the optional Saddle Finisher-AE2 is attached.
1
3
2
3-88 Clearing Staple Jams
Open the front cover of the finisher.
Grip the saddle stitcher unit by its handle, and pull it out of the finisher
until it stops.
Saddle Stitcher Unit