Canon IMAGEFORMULA DR-2020U - Manual (Page 69)

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3
If the jammed document does not appear wrinkled or
otherwise damaged, close the feeder cover, and press the
STOP button.
The jammed document is ejected, and the error message is
cleared on the display.
4
If the document is jammed at an angle or wrinkled,
carefully remove the document without tearing it.
IMPORTANT
Remove the document carefully, and do not pull with excessive
force. Should the document tear, always be sure to remove any
pieces of paper remaining in the scanner.
5
Close the feeder cover gently.
CAUTION
When closing the feeder cover, be careful not to get your fingers
caught, as this may result in personal injury.
6
Press the STOP button to clear the error message on the
display.
Hint
After clearing the paper jam, confirm whether the last document
was scanned before you continue scanning.