Canon imageRUNNER ADVANCE 4551i Service Manual page 332

8. Press the White Plate upward as shown in the figure below.
CAUTION:
If the White Plate is pressed downward, it is placed on the Index Sheet, so be sure to press it upward.
9. With the DADF closed, check that the White Plate is not placed on the Index Sheet as shown in the figures.
CAUTION:
Be sure that there is no gap between the White Plate and the Index Sheet. As a guide, it should be 0.3 mm or less.
● Adjusting the Reading Position
1. Execute the following item in the service mode.
(LV.1) COPIER > FUNCTION > INSTALL > STRD-POS
2. Press [OK].
The scanner to start a scan; in several seconds, the DADF will end auto adjustment of the read position and indicate [OK!].
White Plate Index Sheet
Reader Unit
White Plate Index Sheet
Reader Unit
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White Plate Index Sheet
Reader Unit
White Plate Index Sheet
Reader Unit
5. Adjustment