Troubleshooting; White Fine Line / Banding / Missing Dot / Scratchy Printing / Blurred Printing - Roland VersaUV LEJ-640 Service Notes

6 Troubleshooting

6-1 WHITE FINE LINE / BANDING / MISSING DOT / SCRATCHY PRINTING / BLURRED PRINTING

Missing dot or
deflected-fired dot
appears on the test
pattern.
No
Refer to 1 to 13
NO CHECKING POINT
The printer is not
1 installed in an
appropriate location
The media is not set
2
up correctly
Warped media (rigid
3
media)
Wrong value of the
4 media thickness (rigid
media)
Static electricity of the
5
media
Bi-directional
6 adjustment is not
correct
FEED CALIBRATION
7
is not correct
Scanning distance of
8
the Head Carriage
[PERIODIC CL.]
9
setting
Head Rank is not
10
correct
11 Head is not adjusted
12 Ink mist on UV lamp
13 Broken UV lamp
14 Broken UV lamp motor
Yes
ACTION
Install in a location
that is level and stable
offering good
operating conditions
Load and set up the
media correctly at the User's Manual
correct position
Print with uni-direction
or, change the media
Re-measure and re-
enter the value of the
media thickness
Remove the static
electricity with
utralization apparatus
Correct setting for
User's Manual
Bidirectional Printing
Apply Calibration User's Manual
Set the [FULL WIDTH
User's Manual
S] to [FULL]
Set [PERIODIC CL.] to
User's Manual
[NONE] or [Page]
[3-1 HEAD
Set Head Rank
REPLACEMENT]
[4-4 HEAD
Head Alignment
ALIGNMENT]
Manual Cleaning User's Manual
[3-14 UV LAMP
UV lamp Replacement
REPLACEMENT]
UV lamp motor [3-15 UV LAMP
Replacement REPLACEMENT]
Perform Normal
Cleaning
Not Improved
*Several Normal Cleanings and a Powerful Cleaning
do not improve the printing result.
Refer to 14 to 27
REFERENCE
Never install the printer in a location where it is tilted or
where it may wobble or experience vibration.
Feed is not smooth when media is tilted or tensioned
unevenly on the left and right. Reload and set up the
media correctly.
Ink landing position is different from at going and returning
when the media is warped. Print with uni-direction, or
change the media when the media is warped more than
0.5mm.
Ink does not land on the proper position when the right
media thickness is not entered, because the clearance
between the media and head becomes too big.
If the media has static electricity, ink does not land on a
proper position and it causes uneven printing.
If the calibration is not correct, white fine lines caused by
gaps or dark lines caused by overlaps appear.
Set [FULL WIDTH S] to [FULL] to uniform the heating time
on each pass. This may improve printing quality.
When this is set to [5 min] to [990 min], self cleaning is
performed while a printing is paused. It may cause uneven
printing at the part before and after cleaning.
Head Rank setting affects the amount of the fired Ink. If it
is not set properly, the ink dots are not fired in appropriate
sizes.
Check whether each [BIAS/VERTICAL], [HORIZONTAL]
and [BI-DIR.DEFAULT] settings are correct.
If the UV lamp is contaminated with ink mist, it cannot cure
the ink enough.
If the broken UV lamp motor affects the UV lamp
movement and the UV lamp irradiates the ink correctly.
6-1
Improved
Completed
OUTLINE