2. Remove the Reader Unit Lower Cover [1].• 1 Screw [2]• 4 Claws [3]• 3 Harnesses [4]• 2 Flat Cables [5]• 2 Grounding Wires [6][1][2][3][3]1x7x[3][3][6][5][5][4]3. Remove the harness [1] and the grounding [2].• 6 harness guides [3][3][1][2][3][3]6x4. Raise the ADF Unit [1] to separate from the ReaderUnit [2] in the direction of the arrow.[1][2]NOTE:Be sure to open the ADF Unit [1] to the degree indicatedwith the direction of the arrow [A]; otherwise, the ADF Unitcannot be separated from the Reader Unit [3] because ofthe 2 claws [2].[A][1][2][2][3]■ After Replacing the ADF Units1. Adjust the white level in the following service mode,and write the final setting values on the service label.1. Enter the values in the following service modeitems respectively.• In COPIER > ADJUST > CCD > DFTAR-R, set"299".• In COPIER > ADJUST > CCD > DFTAR-G, set"309".• In COPIER > ADJUST > CCD > DFTAR-B, set"307" .• In COPIER > ADJUST > CCD > DFTAR-BW,set "315".2. Place a sheet of A4 or LTR blank paper (paperrecommended by Canon) on the Platen Glass ofthe reader, and execute• COPIER > FUNCTION > CCD > DF-WLVL1(White level adj in book mode (color))3. Place the same blank paper on the ADF, andexecute• COPIER > FUNCTION > CCD > DF-WLVL2(White level adj in ADF mode (color))4. Disassembly/Assembly132
