Canon imageRUNNER ADVANCE 6075 Series Service Manual page 149

2
Technology > Image Formation System > Servicing > Troubleshooting
● Uneven density
[Cause]
Uneven density occurs on the image because of uneven developing performance or change
in drum characteristics due to wear.
[Field Remedy]
Start the field remedy
Is it straight uneven density?
NO
Adjust developing bias
COPIER > ADJUST > VCONT > DE-OFST
YES
Is it fixed?
NO
Enable 2D shading
COPIER > OPTION > IMG-LSR > 2D-SHADE; ON
YES
Is it fixed?
NO
Execute 2D shading individual correction
Field remedy is complete
2 Technology > Image Formation System > Servicing > Troubleshooting
YES
Adjust height of the Primary Charging Wire
(Set the dark area apart)
Feed Direction
In the case of dark/light image at either the left or right side on the image in horizontal
direction, adjust height of the Primary Charging Wire and check the output result. When
making adjustment, execute the work while keeping the wire at dark area apart.
Feed Direction
If it is not a straight uneven density, change the value of the following service mode in
decrement of -10 and check the output result.
COPIER > ADJUST > VCONT > DE-OFST
(Setting value: default 0, -10, -20, ...-50)
CAUTION :
Executing the above setting can generate smeared image or foggy image.
After switching the mode to enable 2D shading in the following service mode, turn OFF/ON
the main power and check the output result.
(For detailed procedure, see "Troubleshooting > Uneven density correction by 2D shading >
Step 1) to 3) (Refer to page 6-7)
COPIER > OPTION > IMG-LSR > 2D-SHADE Setting value: 1 (ON)
Output the test pattern for 2D shading and adjust the uneven density area individually.
(For detailed procedure, see "Troubleshooting > Uneven density correction by 2D shading >
Step 4) to 5) (Refer to page 6-7)
F-2-120
2-95
OR
F-2-121
OR
F-2-122
2-95