Ink Drops On The Media; Vertical Banding - Roland VersaUV LEJ-640 Service Notes

6-3 SHIFTING IN PRINTING / COLOR SHIFTING
NO CHECKING POINT
Encoder Module is
3
dirty/broken
Head is out of
4
adjustment
Bad contact of Flexible
5
Cable

6-4 INK DROPS ON THE MEDIA

1 Foreign substances
2 Media strikes Head
Static electricity of
3
the media
4 Wiper wears out
5 Broken Ink Tube
6 Broken Head

6-5 VERTICAL BANDING

NO CHECKING POINT
1 Encoder Scale is dirty
2 LM Guide is dirty
There is dirt in teeth of
3
the gear
4 Printing direction
5 Kind of media
ACTION
Clean or replace
Encoder Module
[4-4 HEAD
Head Alignment
ALIGNMENT]
Refix / Replace the
Flexible Cable
Manual Cleaning User's Manual
Use the media clamps/
Replace with suitable
media
Perform [PERIODIC
User's Manual
CL]
Wiper Replacement User's Manual
[3-7 INK TUBE
Ink Tube Replacement
REPLACEMENT]
[3-1 HEAD
Head Replacement
REPLACEMENT]
ACTION
[3-12 ENCODER
Clean / Replace
SCALE
Encoder Scale
REPLACEMENT]
Clean LM Guide
Clean the gear
Change Bi-direction to
Uni-direction, or select
a higher resolution
mode
Change the media
REFERENCE
When Encoder Module is not read correctly, printing
position may shift.
If the Heads are not aligned or Horizontal adjustment is
not performed properly, the color shifting occurs.
If the Flexible Cable is not fixed correctly, the Head moves
incorrectly and results in the shifting in printing.
When foreign substances such as fiber dust are stuck on
the surface of the Head, the ink sometimes leaks from it.
Wipe the surface of Head with a cleaning stick.
If media tends to curl or become bumpy due to the ink
absorption and/or the Heater temperature, the Head
sometimes strikes the media and it causes the ink
dropping problem.
If media produces electrostatic easily, the ink tends to
remain on the head surface while printing and results in
ink dropping. When this is set to [5 min] to [990 min],
automatic cleaning is performed while printing and it may
prevent the ink dropping.
Also, connecting to ground or humidifying the room may
reduce the static electricity generated on the media.
Cleaning does not work effectively with worn wiper.
Therefore, foreign substances stuck on the head surface
cannot be removed completely and the ink flows through it
and results in ink dropping.
When the Ink Tube is broken, it is not possible to keep the
ink line air tight and results in ink dropping.
When a head is broken mechanically such as a crack, it is
not possible to keep the ink line air tight and results in the
ink dropping.
REFERENCE
When there is scratch or dirt on the Encoder Scale, the
printing image could be affected and the vertical bandings
could appear at the position where there is scratch or dirt.
When the sliding resistance in the motion of the Head
Carriage increases partly due to some dirt on the LM
Guide, it may affect the printing at the position where there
is dirt and the vertical banding may appear.
When there are foreign substances on the teeth of the
gear, the movement of the Head Carriage changes at the
position where there is dirt. And it results in the periodical
vertical banding.
Depends on the media or the printing color, vertical
banding is more likely to appear. This is the capability of
the machine and cannot be solved completely. The
symptom can be minimized by changing printing direction
to Uni-direction or selecting a higher resolution.
Depends on the media or the printing color, vertical
banding is more likely to appear. This is the capability of
the machine and cannot be solved completely. The
symptom tends to move visible with the media that has
vertical hairline finishing on it.
6-4
OUTLINE
OUTLINE