Canon MF720 Series Service Manual page 158

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.
3. 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.
7. Whether the operation was successful or failed is
not shown on the UI, so perform the following
procedure to judge if the operation is successful or
not.
• COPIER > ADJUST > CCD > DFTAR-R
(Adjustment of shading target value (R) at ADF
reading)
• COPIER > ADJUST > CCD > DFTAR-G
(Adjustment of shading target value (G) at
ADF reading)
• COPIER > ADJUST > CCD > DFTAR-B
(Adjustment of shading target value (B) at ADF
reading)
Check the foregoing values, and if all the values
remain the same with those you entered, the
operation result is judged to be "failed".
8. If the operation result is "failed", turn OFF and then
ON the power, execute
• COPIER > FUNCTION > CCD > DF-WLVL1
(White level adj in book mode: color)
and then execute
• COPIER > FUNCTION > CCD > DF-WLVL2
(White level adj in ADF mode: color)
again.
9. Checking the value of DFTAR-BW
Check the value of
• COPIER > ADJUST > CCD > DFTAR-BW
(Adjustment of shading target value (B&W) at
ADF reading)
If the value remains the same as the value you
entered, the operation result is judged to be
"failed".
10. If the operation result is "failed", turn OFF and then
ON the power, execute
• COPIER > FUNCTION > CCD > DF-WLVL3
(White level adj in book mode (B&W))
and then execute
• COPIER > FUNCTION > CCD > DF-WLVL4
(White level adj in ADF mode (B&W))
again.
4. Copyboard geometric adjustment
Enter the values shown on the label that comes with the
part in the following service mode items.
• COPIER > ADJUST > ADJ-XY > ADJ-X (Adj of img
pstn in book mode: vert scan)
• COPIER > ADJUST > ADJ-XY > ADJ-Y (Adj of img
pstn in book mode: (horizontal scanning direction)
• COPIER > ADJUST > ADJ-XY > ADJ-X-MG (Fine
adj image ratio: vertical scanning)
Enter the values in the foregoing service mode.
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4. Disassembly/Assembly