Canon Finisher-AB1 Service Manual page 326

Chapter 4
4) Release the stopper [1] of the rail, and pull it out
about 5 cm.
F-4-121
5) Disconnect the 3 connectors [1], and remove the
screw [2]; then, slide out the saddle unit in the
direction of the arrow.
[1]
[3]
F-4-122
4-32
[1]
[2]
6) Move the saddle unit in the direction of the arrow
until the screw [1] is visible through the hole [2];
then, remove the screws [1] [3].
[1]
[1]
F-4-123
7) Push in the rail [1] inside the machine.
F-4-124
[2]
[3]
[1]