Canon Inner Finisher-L1 Service Manual page 114

4. Contact a sheet of paper with the rear alignment plate to check the gaps between the alignment plate and a sheet
of paper at [A] and [B] portion. In the case the gap is large, adjust the right-angle adjustment of alignment plate
again.
5. Widen the front alignment palte approx. 10mm.
[A]
Paper
107
Rear Alignment Plate
[B]
5. Adjustment