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You have to be very thorough when seeking out paper jams. Any fragment of paper less than 1inch X 1inch will cause an error and may be in the most obscure place.
There is now reset option for this device.
For this problem downloading the drivers and reloading them may fix your issue.
If you are sure there is no paper jam:
Other possible problem
The rear spring could have fallen off on the idler gear. You might look to see if a spring came loose on the back side of the bottom frame. If so seek the help of a canon rep to fix it.
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