The back side of the paper is dirty
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Check 1 Was the previous print job borderless, or printed on small paper?
Open the top cover and clean the platen.
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Check 2 Is Detect paper width in the touch screen menu set to Disable?
Printing with Detect paper width set to Disable may cause the platen to be dirtied.
Set Detect paper width in the touch screen menu to Enable, and then open the top cover and clean the platen.
To continue printing with Detect paper width set to Disable, first open the top cover and clean the platen, and then manually feed roll paper over the platen when printing.
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Check 3 Paper may be gripped weakly over the platen.
Set a higher Transport unit vacuum strength in the touch screen menu.
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Check 4 Is the setting of Extension for borderless printing in the touch screen menu large?
The platen may become dirtied by setting a large amount of extension.
Reduce the setting of Extension for borderless printing in the touch screen menu to less than the current setting.
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Check 5 If using plain paper, is the media type set to Plain papers?
Set the media type to PlainP(Quick-dry) or PlainP(Instant-dry) for improved quick-drying.
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Check 6 Does this paper take longer to dry?
Increase the length of the Pause between pages and Pause between scans settings from the touch screen menu.
Note-
When printing on paper that takes longer to dry, the paper may curl during printing and come in contact with the output tray.
In such situations, set an Ink drying wait time and an Ink drying target area for Pause between scans in the touch screen menu.
However, note that printing will now take longer.
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Note
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If the platen is dirty, open the top cover and clean the platen.
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In a hot and humid environment, rolling paper printed with images containing areas of saturated color may transfer ink to the contact surface, affecting print quality.
Move the printer to a different environment, or let the paper dry before rolling it.
