Canon imageRUNNER ADVANCE C255 Series Service Manual page 705

COPIER (Service mode for copier) > FUNCTION (Operation / inspection mode) > CCD
DF-WLVL2 1
Detail
Use Case
Adj/Set/Operate Method
Caution
Display/Adj/Set Range
Related Service Mode
DF-LNR 1
Detail
Use Case
Adj/Set/Operate Method
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
CL-AGC 1
Detail
Use Case
Adj/Set/Operate Method
Display/Adj/Set Range
Related Service Mode
White level adj in DADF mode: color
To adjust the white level for DADF scanning automatically by setting the paper which is usually
used by the user on the DADF.
- When replacing the Copyboard Glass
- When replacing the Scanner Unit (Back)
- 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
Deriving of DADF front/back linearity
To derive the front/back side linearity in DADF mode based on the scanning data which has been
backed up at factory.
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.
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 Unit (Front/Back) 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 label of the Scanner Unit (Front/Back).
Adj Scan Unit white/black ref level: AGC
To adjust the black/white reference level of the Scanner Unit automatically (automatic gain control).
To make the adjustment with both resolutions 300 dpi and 600 dpi.
- When replacing the Copyboard Glass
- When replacing the Scanner Unit
1) Select the item, and then press OK key.
2) After "OK!" is displayed, turn OFF/ON the main power switch.
During operation: ACTIVE, When operation finished normally: OK!
COPIER> ADJUST> CCD> OFST-CL0 - OFST-CL5, OFST2CL0 - OFST2CL5, GAIN-CL0,
GAIN2CL0, LED-CL-R/G/B, LED2CL-R/G/B, LED-CLR2, LED-CLG2, LED-CLB2, LED2CLR2,
LED2CLG2, LED2CLB2
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8. Service Mode