Canon imageRUNNER ADVANCE 4551i Service Manual page 707

COPIER > FUNCTION > CCD
DF-WLVL2 1
Detail
Use Case
Adj/Set/Operate Method
Caution
Display/Adj/Set Range
Related Service Mode
Supplement/Memo
DF-LNR 1
Detail
Use Case
Adj/Set/Operate Method
Caution
Display/Adj/Set Range
Related Service Mode
MTF-CLC 1
Detail
Use Case
Adj/Set/Operate Method
Caution
Display/Adj/Set Range
Related Service Mode
Supplement/Memo
White level adj: stream reading, color
To adjust the white level for stream reading by setting the paper which is usually used by the user
on the DADF.
- When replacing the Copyboard Glass
- When replacing the Scanner Unit
- When replacing the Reader Controller PCB/clearing RAM data
1) Set paper on the DADF.
2) Select the item, and then press OK key.
Be sure to execute this item after DF-WLVL1.
During operation: ACTIVE, When operation finished normally: OK!
COPIER> FUNCTION> CCD> DF-WLVL1
- In the case of DADF (reverse model)
The Scanner Unit (for front side) calculates the white level correction coefficient based on the
luminance at copyboard reading detected with DF-WLVL1 and the luminance at stream reading
detected with DF-WLVL2.
- In the case of DADF (1-path model)
The Scanner Unit (for front side) calculates the white level correction coefficient based on the
luminance at copyboard reading detected with DF-WLVL1, the luminance at stream reading
detected with DF-WLVL2, and the luminance at stream reading that the Scanner Unit (for back
side) detected with DF-WLVL2.
Deriving of DADF front/back linearity
To derive the front/back side linearity characteristics when using the DADF (1-path model) based
on the scanned data that has been backed up at factory.
The setting of this item is enabled only when the DADF (1-path model) is installed.
When replacing the Reader Controller PCB/clearing RAM data
1) Enter the value of the reader's service label.
COPIER> ADJUST> CCD> DFCH-R2, DFCH-G2, DFCH-B2, DFCH-K2, DFCH-R10, DFCH-G10,
DFCH-B10, DFCH-K10, DFCH2R2, DFCH2G2, DFCH2B2, DFCH2K2, DFCH2R10, DFCH2G10,
DFCH2B10, DFCH2K10
2) Select the item, and then press OK key.
When the Copyboard or DADF (reverse model) is installed, the setting of this item is disabled.
During operation: ACTIVE, When operation finished normally: OK!
COPIER> ADJUST> CCD> DFCH-R2, DFCH-G2, DFCH-B2, DFCH-K2, DFCH-R10, DFCH-G10,
DFCH-B10, DFCH-K10, DFCH2R2, DFCH2G2, DFCH2B2, DFCH2K2, DFCH2R10, DFCH2G10,
DFCH2B10, DFCH2K10
Deriving of MTF filter coefficient
To derive the MTF filter coefficient to be set for ASIC based on the MTF value which has been
backed up.
When replacing the Reader Controller PCB/clearing RAM data
Select the item, and then press OK key.
Be sure to enter the MTF values for the Scanner Units (for front side/back side) in MTF-M1 to 12/
S1 to 12 and MTF2-M1 to 12/S1 to 12 in advance.
During operation: ACTIVE, When operation finished normally: OK!
COPIER> ADJUST> CCD> MTF-M1 - M12, MTF-S1 - S12, MTF2-M1 - M12, MTF2-S1 - S12
MTF values are written on the labels of the Scanner Units.
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8. Service Mode