Oki MC780fx User Manual page 26

TROUBLESHOOTING FOR COPYING
Problem Description
Copied image has black streaks
in the horizontal direction.
1
2
Copied image has white streaks
or color streaks in the vertical
direction.
3
A color original is copied in black
and white even if [AUTO
4
COLOR] is selected for the color
mode.
A black-and-white original is
copied in color even if [AUTO
COLOR] is selected for the color
mode.
5
6
7
Cause
The scanning area or guides are stained.
The LED print head is stained.
Some color originals may be copied in black
and white:
• Originals with very little colored part
• Overall blackish originals
• Originals in light color
Some black and white originals may be
copied in color:
• Yellowed originals
• Originals with background color
Clean them.
Clean the LED print head.
Set the color mode to [FULL COLOR].
You can change the criterion for determining whether an
original is black and white or color.
For further information, refer to the Advanced Guide.
Set the color mode to [BLACK].
You can change the criterion for determining whether an
original is black and white or color.
For further information, refer to the Advanced Guide.
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Corrective Action