Canon iR6570 series Service Manual page 378

Chapter 9
[1]
3) Remove the 2 jam removing levers [1] of the duplexing feed unit;
then, remove the 2 screws [2], and detach the duplexing feed front
cover [3].
[2]
[2]
[1]
Memo:
The work in step 3) is in preparation for step 5), thereby facilitating the
sliding out farther of the fixing feed unit in step 5).
4) While pushing the hook shaft [1] found at the rear of the fixing feed
unit in the direction of the arrow (i.e., toward the machine's front),
turn the fixing feed unit releasing lever [2] clockwise to lock it in
place.
9-24
[2]
F-9-35
[3]
[2]
F-9-36
[2]
5) While pushing the 2 stopper plates [1] and the rail assembly of the
fixing feed unit toward the inside, slide out the fixing feed unit [2] to
the front.
[1]
F-9-37