The back side of the paper is dirty – Canon imagePROGRAF GP-4000 User Manual
Page 755
The back side of the paper is dirty
Check 1
Was the previous print job borderless, or printed on small paper?
Open the top cover and clean the platen.
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.
Cleaning Inside the Top Cover
Feeding Roll Paper Manually
Check 3
Paper may be gripped weakly over the platen.
Set a higher
Transport unit vacuum strength
in the touch screen menu.
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.
Check 5
If using plain paper, is the media type set to
Plain papers
?
755