Canon imageRUNNER ADVANCE 4551i Service Manual page 316

■ Right Angle Adjustment (Slant Adjustment)
NOTE:
There are two adjustment methods: One for reading the front side (Scanner Unit on the Reader side) and another for reading the
back side (Scanner Unit on the DADF side).
● Adjustment of the Paper Front Reading
1. Place a test chart on the ADF and perform 1-sided print.
2. Check the A part of the printed paper for the squareness of the image. Make adjustment if it is not at a right angle.
3. Remove the ADF White Plate [1].
4. Loosen the 4 Knurled Screws [1] at the front part of the Right and Left Hinge Unit.
5. Rotate the screw [2] of the right hinge to move the Fixation Member.
A = Less than 90 degrees: Turn the screw counterclockwise
A = 90 degrees or more: Turn the screw clockwise
6. After adjustment, tighten the 4 Knurled Screws.
7. Print the test chart again, and check that the A part is at a right angle.
8. Install the White Plate removed in step 3. Check that the White Plate is not placed on the Index Sheet.
● Adjustment of the Paper Back Reading
1. Place a test chart facing down on the ADF and perform 2-sided print.
Image on test chart
[1]
Printed image
Feed direction
[1]
303
5. Adjustment
[2]