Canon imageRUNNER ADVANCE 4551i Service Manual page 315

Checking the Height of the Height Adjustment Boss on the Front Side
1. Put a sheet of paper [2] on the place where the protrusions touch the Stream Reading Glass [1], and check whether
there is any resistance of the paper when closing the ADF.
[1]
[2]
2. If there is no resistance, perform the height adjustment.
Checking the Height of the Height Adjustment Boss on the Rear Side
1. Put a sheet of paper [2] on the place where the protrusions touch the Stream Reading Glass [1], and check whether
there is any resistance of the paper when closing the ADF.
[2]
2. If there is no resistance, perform the height adjustment.
● Adjustment procedure
1. Make adjustment by turning the Fixation Screw on the upper side of the Left Hinge.
If the front side is not installed properly: Turn the screw clockwise (black arrow).
If the rear side or both sides are not installed properly: Turn the screw counterclockwise (white arrow).
2. Check the height again and see if it is at an appropriate height.
[1]
[1]
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5. Adjustment