Canon DADF-P1 Service Manual page 25

This operation is performed for all double-sided documents irrespective of whether document widths are the same or different.
Document
Pickup
Formation of loop
Waiting for reading
Reading
to next page
F-2-4
Reverse side reading
Feed
Reversal
Feed
F-2-5
Feed
Reversal
Formation of loop
Waiting for reading
Feed
Idle feed
Delivery
End of job
Chapter 2
2-3