Canon MF720 Series Service Manual page 140

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]
1x
7x
3. Remove the harness [1] and the grounding [2].
• 6 harness guides [3]
6x
[4]
[5]
[5]
[3]
[1]
[3]
[2]
[3]
[3]
[6]
[1]
[3]
[3]
[3]
[2]
132
4. Raise the ADF Unit [1] to separate from the Reader
Unit [2] in the direction of the arrow.
NOTE:
Be sure to open the ADF Unit [1] to the degree indicated
with the direction of the arrow [A]; otherwise, the ADF Unit
cannot be separated from the Reader Unit [3] because of
the 2 claws [2].
[2]
[3]
[1]
■ After Replacing the ADF Units
1. 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 mode
items 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 (paper
recommended by Canon) on the Platen Glass of
the reader, and execute
• COPIER > FUNCTION > CCD > DF-WLVL1
(White level adj in book mode (color))
3. Place the same blank paper on the ADF, and
execute
• COPIER > FUNCTION > CCD > DF-WLVL2
(White level adj in ADF mode (color))
4. Disassembly/Assembly
[1]
[2]
[A]
[2]