Canon DR-9080C - Manual (Page 73)

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6
6.2 Clearing Paper Jams
5
Carefully close the upper scanner.
Do not force the upper scanner down. Doing so might damage the
scanner.
6
Press the upper scanner down firmly on both sides to close it.
If you press the upper scanner down only on one side, the opposite side
will not be fully closed. Make sure that you hear it click into place.