Canon imageRUNNER ADVANCE 4551i Service Manual page 684

COPIER > ADJUST > LASER
LDADJ6-K 1
Detail
Use Case
Adj/Set/Operate Method
Caution
Display/Adj/Set Range
Default Value
■ DEVELOP
COPIER > ADJUST > DEVELOP
DE-OFST 1
Detail
Use Case
Adj/Set/Operate Method
Caution
Display/Adj/Set Range
Default Value
Amount of Change per
Unit
■ DENS
COPIER > ADJUST > DENS
DENS-ADJ 1
Detail
Use Case
Adj/Set/Operate Method
Caution
Display/Adj/Set Range
Default Value
Supplement/Memo
Phase difference between A-D laser (K)
When replacing the laser scanner unit, enter the value of service label stuck on the laser scanner
unit.
- When replacing the CCD unit (CCD PCB)/clearing RAM data
- When replacing the laser scanner unit
Enter the setting value, and then press OK key.
After the setting value is changed, write the changed value in the service label.
-512 to 511
0
Enter offset value for develop DC bias
To set the Vdc offset auto adjustment value for potential control of copy image manually.
As the value is changed by 1, the offset value is increased or decreased by 0.3%.
+: Increase
-: Decrease
As the value is increased, copy image gets darker.
When the abnormal image appears (high or low density)
Enter the setting value, and then press OK key.
After the setting value is changed, write the changed value in the service label.
-128 to 127
0
0.3
Density correction of copy image
To correct the density of copy image by changing the F-value table.
When replacing the DC Controller PCB/clearing RAM data, enter the value of service label.
Blurring is alleviated when the value is increased, and fogging is alleviated when the value is
decreased.
When fogging or blurring at high density area occurs with a copy image
Enter the setting value, and then press OK key.
Density of printer output image cannot be corrected.
1 to 9
5
F-value table: shows the relationship between original density and image density.
671
8. Service Mode