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Image Quality Issues
4
4.
Troubleshooting
Symptom
Cause
Remedy
Reference
Page
Horizontal lines
and spots appear
periodically.
If the interval of lines or spots
is about 94 mm (4 inches), the
image drum (the green tube) is
damaged or dirty.
Lightly wipe the image drum with
soft tissue paper.
Replace the image drum if it is
damaged.
If the interval of lines or spots is
about 37 mm (1.5 inches), foreign
materials may be present on the
image drum.
Open and close the top cover, and
print again.
–
If the interval of lines or spots is
about 143 mm, there is damage to
the fuser unit.
Replace the fuser unit.
The print cartridge has been
exposed to light.
Place the print cartridge back
into the printer and leave it for a
few hours. If that does not solve
the problem, replace the print
cartridge.
The paper feed path is dirty.
Print a few test pages.
–
White area of paper is
lightly stained.
The paper contains static
electricity.
Use paper stored in proper
temperature and humidity
conditions.
The paper is too thick.
Use thinner paper.
–
The toner is low.
For the models B721/B731:
Replace the print cartridge.
For the models ES7131/MPS4900b
/MPS5501b: Replace the toner
cartridge.
Periphery of letters is
smudged.
The LED heads are dirty.
Wipe the LED heads with soft
tissue paper.
The paper is unsuitable.
Use supported paper.
The paper is moist.
Replace it with new paper.
The entire paper area
is lightly stained when
printing on envelopes or
coated paper.
The toner may be sticking to the
whole area of the envelope or
coated paper.
This is not a malfunction of the
printer.
Coated paper is not
recommended.
–
Toner comes off when it
is rubbed.
The settings of media type and
weight are incorrect.
Press the button and select
[
Menus
] > [
Tray Configuration
]
> the paper tray configuration
you are using, and then select the
proper values for [
Media Type
]
and [
Media Weight
]. Or, select a
larger value for [
Media Weight
].
–
Recycled paper is used.
The media weight setting is
unsuitable.
Press the button and select
[
Menus
] > [
Tray Configuration
]
> the paper tray configuration you
are using, and then select a larger
value for [
Media Weight
].
–
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