Oki C831n User Manual page 107

Symptom
Printed images are
partially faded. Spots
and lines appear.
Horizontal lines
and spots appear
periodically.
Paper feed direction
White area of paper is
lightly stained.
Periphery of letters is
smudged.
The entire paper area
is lightly stained when
printing on envelopes or
coated paper.
Point to check
The paper is too moist or dry.
[Paper Black Setting] or
[Paper Color Setting] is
improperly configured.
[Trans. Black Setting] or
[Trans. Color Setting] is
improperly configured.
If the interval of lines or spots
is about 94 mm (4 inches), the
image drum (the green tube) is
damaged or dirty.
If the interval of lines or spots is
about 30 mm (1.5 inches), foreign
materials may be present on the
image drum.
If the interval of lines or spots is
about 143 mm, there is damage to
the fuser unit.
The image drum has been exposed
to light.
The paper feed path is dirty.
The paper contains static
electricity.
The paper is too thick.
The toner is low.
The LED heads are dirty.
The paper is unsuitable.
The paper is moist.
The toner may be sticking to the
whole area of the envelope or
coated paper.
Remedy
Use paper stored in proper
temperature and humidity
conditions.
Press the <ENTER> button
and select [Menus] > [System
Adjust], and then change the
value for [Paper Black Setting]
or [Paper Color Setting].
Press the <ENTER> button and
select [Menus] > [System
Adjust], and then change the
value for [Trans. Black Setting]
or [Trans. Color Setting].
Lightly wipe the image drum with
soft tissue paper.
Replace the image drum if it is
damaged.
Open and close the top cover, and
print again.
Change the fuser unit.
Place the image drum back into
the printer and leave it for a few
hours. If that does not solve the
problem, replace the image drum.
Print a few test copies.
Use paper stored in proper
temperature and humidity
conditions.
Use thinner paper.
Replace the toner cartridge.
Wipe the LED heads with soft
tissue paper.
Use recommended paper.
Replace it with new paper.
This is not a malfunction of the
printer.
Coated paper is not recommended.
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Other Issues
Reference
page 59
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3
page 119
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page 124
page 119
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page 59
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page 114
page 129
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page 59
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