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Black stripes appear on the print.
Basic image
[Cause]
The print head periphery
is smeared.
Cause
[Symptom A]
The print head periphery is
l
smeared.
[Symptom B]
At bidirectional printing, the
l
ejected ink's color order in
rightward print is different from
in leftward print.
[Symptom C]
The media advance
l
compensation is not proper.
[Symptom C]
The media advance accuracy is
l
poor, or is not stable.
60
IP-7900-20/21/7700-20/21 Advanced Operation Guide
[Symptom A]
[Symptom B]
[Cause]
At bidirectional printing,
the ejected ink's color
order in rightward print
is di erent from in
leftward print.
(1) Check the obstructions such as media lint or ink clot in the nozzle surface path
including the platen surface, and remove them.
(2) If the ink is accumulated or the net tears on the spittoon case surface, replace
them.
(3) If the media is curled or wrinkled, solve the problem by referring to the
description on the problem, "The media is curled or wrinkled."
(4) Perform the daily maintenance.
* Do not forget to clean the head guard and edge guards.
* Be sure to perform the print head cleaning.
(5) Perform the CHARGE CAP CL.
(6) With the print sheet mount cleaning ( Basic Operation Guide
clean the print head surface.
(1) Set smart pass to a higher setting.
(2) Change the print mode to be slower.
(3) Print in unidirectional mode.
(4) Use the proven media.
Adjust the media advance compensation.
* The media advance compensation differs depending on the winding mode, LOOSE or
TENSION.
(1) Check that the media was installed properly with the conditions below.
- The installed media is properly parallel to the Printer and the flange.
- The operation panel shows the media type correctly.
- The supply-side tension bar length is proper and it is placed on the center of the
media.
- The media winding mode is optimal to the installed media.
- If the media is curled or wrinkled, see the description on the problem, "The media is
curled or wrinkled. "
(2) Adjust the pressure on the media with the pressure control knob.
(3) Set smart pass to a higher setting.
(4) Change the print mode to be slower.
[Symptom C]
[Symptom D]
* Black stripes appear over the print.
* Black stripes appear partly on the
print.
[Cause]
[Cause]
The media advance
The ink dries too slowly.
compensation is not
proper.
Solution
*1*2
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page 96 ),
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