Canon imageRUNNER ADVANCE 4551i Service Manual page 337

1. Place the white copy paper which the user usually uses on the copyboard glass. Execute the following item in the
service mode.
(LV.1) COPIER > FUNCTION > CCD > DF-WLVL1
2. Press [OK].
Automatic adjustment starts; if it ends successfully, the screen shows [OK!].
3. Remove the paper from the copyboard glass and place it onto the DADF. Execute the following item in the service
mode.
(LV.1) COPIER > FUNCTION > CCD > DF-WLVL2
4. Press [OK].
Automatic adjustment starts (duplex stream reading); if it ends successfully, the screen shows [OK!].
5. If adjustment fails, perform steps 1 to 4 again.
6. Select the following item in the service mode to check the value, and write down the new adjustment value on the
service label.
(LV.1) COPIER > ADJUST > CCD > DFTAR-R/ DFTAR-G/ DFTAR-B
NOTE:
The service label affixed to the back of Reader Front Cover.
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5. Adjustment