Canon imageRUNNER ADVANCE 6055 Series, Service Manual

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Troubleshooting > Image Faults > Smeared image
Troubleshooting > Image Faults > Smeared image
Feed Direction
OR
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
OR
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-6-37
F-6-38
Smeared image
[Cause]
Excess toner is transferred on the paper that causes toner collapse at the time of fixing, which
can generate smeared image on the image. The following are assumed causes of smeared
image:
• When the paper type is changed
• Toner deterioration
• Rapid change in environment (High temperature <- -> Low temperature)
< Smeared Image >
Feed Direction
Side Line
Smeared image may also occur exclusively in the area 5 to 10 mm from the leading edge of
the paper when there is burr on the leading edge of the paper (jagged edge formed when the
paper was cut by a cutter).
It is caused by toner being pushed backward by the power of the ETB, which is pushed down
by the burr when it passes through the transfer nips, to go back to the original position.
Transfer Roller
Photosensitive Drum
ETB
Paper
Toner
Burr
Smeared image
F-6-39