In order for the DFR button to work properly, 2 things must be enabled first:
- Detect by Ultrasonic (located in the “Feeding Tab” of the driver
![Make sure you enable "Detect by Ultrasonic".](/library/CANON/CITS_TECH_SUPPORT/BISG/ICS/US1.gif)
- Rapid Recovery System (located in the “Others Tab” of the driver
![Make sure you enable "Rapid Recovery".](/library/CANON/CITS_TECH_SUPPORT/BISG/ICS/RR1.gif)
That's it! The next time your scanner detects a double feed, the DFR light will flash allowing you to clear the error and refeed the original document again.