Canon MF720 Series Service Manual page 151

1. Remove the 3 screws [1] at the bottom of the Reader
Unit.
3x
2. Remove the Scoopup sheet holder [1].
• 2 claws [2]
2x
[2]
■ After Replacing the Scoopup Sheet
Holder
1. Automatic adjustment of the stream reading
position
1. Entering a provisional value
Set the value of
• COPIER > ADJUST > ADJ-XY > STRD-POS
(Adjustment of reading position at ADF stream
reading)
to "-20".
2. Automatic adjustment of the stream reading
position
Execute
• COPIER > FUNCTION > INSTALL > STRD-
POS (Scan position auto adj in ADF mode)
If the operation was successful, write the value of
STRD-POS on the service label.
[1]
[1]
3. How to judge whether the operation was successful
or failed
Whether the operation was successful or failed is
not shown on the UI, so perform the following
procedure to judge if the operation was successful
or failed.
Check the value of
• COPIER > ADJUST > ADJ-XY > STRD-POS
(Adjustment of reading position at ADF stream
reading)
If it remains "-20", the operation is judged to be
"failed".
If the operation is judged to be "failed", turn OFF
and then ON the power, and execute COPIER >
FUNCTION > INSTALL > STRD-POS again.
2. 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. Place a sheet of A4 or LTR blank paper (paper
recommended by Canon) on the Platen Glass of
the reader again, and execute
• COPIER > FUNCTION > CCD > DF-WLVL3
(White level adj in book mode (B&W))
5. Place the same blank paper on the ADF again, and
execute
• COPIER > FUNCTION > CCD > DF-WLVL4
(White level adj in ADF mode (B&W))
6. If the operation was successful, write the setting
value on the service label.
143
4. Disassembly/Assembly