Canon Ipf8400 paper jams

[Thenolands]

Just started getting a paper jam error message when attempting to print on cut sheets. However, paper does not appear to be wrinkled or bent. Any ideas of what to try to fix this? Very frustrating as there appears to be nothing wrong with printer.

[deanwork]

Torn off piece of paper back there somewhere. Or dirt on the paper sensor.

Just started getting a paper jam error message when attempting to print on cut sheets. However, paper does not appear to be wrinkled or bent. Any ideas of what to try to fix this? Very frustrating as there appears to be nothing wrong with printer.