White Stripes Appear On The Print - Oki IP-7900-21 Advanced Operation Manual

White stripes appear on the print.

Basic image
Cause
[Symptom A]
Media feed is not adjusted
l
properly.
[Symptom A]
The media advance accuracy is
l
poor, or is not stable.
[Symptom B]
Print head nozzles are clogged.
l
58
IP-7900-20/21/7700-20/21 Advanced Operation Guide
[Symptom A]
[Cause]
Media advance compensation is
not proper.
[Check]
White stripes appear in all
colors when a color stripe
bar is printed.
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.
(1) Perform a nozzle print, and set nozzle map for the clogged nozzles.
( Basic Operation Guide
(2) Check the obstructions such as media lint or ink clot in the nozzle surface path
including the platen surface, and remove them.
(3) If the ink is accumulated or the net tears on the spittoon case surface, replace
them.
(4) If the media is curled or wrinkled, solve the problem by referring to the
description on the problem, "The media is curled or wrinkled."
(5) Perform the daily maintenance.
* Do not forget to clean the head guard and edge guards.
* Be sure to perform the print head cleaning.
(6) Perform the CHARGE CAP CL.
(7) With the print sheet mount cleaning ( Basic Operation Guide
clean the print head surface.
- Printing with a color stripe bar is effective to prevent missing dots. (
[Symptom B]
[Cause]
The print head nozzles are
clogged.
[Check]
White stripes appear in some
colors when a color stripe bar
is printed.
Solution
*1*2
*1*2
page 92 )
[Symptom C]
[Cause]
The ink does not match well with
the media.
*1
page 96 ),
page 29 )