Konica Minolta PKG-675i PKG-675i User Manual - Page 113

Print Quality, PQ Defects, Solution, Cross, Contamination, Vertical Bands of, Incorrect Color

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Print Quality (PQ) Defects Nozzle Area Puddle This defect is characterized by a smooth, parabolic area of non-printing (missing jets) followed by a column of printed image exhibiting ink mixing / cross-contamination. This is caused by a small puddle or drop of ink in the nozzle region of the printhead that prevents ejection of drops. The mass of ink eventually absorbs into adjacent nozzles causing color mixing. Solution As can be observed in the accompanying illustration, the missing jets portion of this defect is self-correcting. With regards to its evolution into the defect Cross Contamination - Vertical Bands of Incorrect Color, many times Cross Contamination will be eliminated during the printing of the next plot. Print Quality (PQ) Defects Dripping Ink Missing jets followed by a dark spot. This defect occurs when a droplet of ink has built up on the nozzle area of the Printhead, blocking the ejection of jetted drops. In some cases, ejected drops can be adding to the mass of the offending droplet. After a while, the droplet falls off of the face of the Printhead and lands on the media, creating an abnormally large spot. The build-up of enough ink in the nozzle area of to create this defect can be caused by a number of reasons including inadequate Printhead maintenance by the Service Station, or the presence of paper fibers that block nozzles. Solution The area of a printhead that is exhibiting this behaviour should be adequately cleaned after returning to the "Capped" state. This occurs 20 seconds after the completion of a print job. If the problem is a persistent one, then perform a "level 2 recovery". DOCUMENT I 18.40V02 - Update: 04.09.2019 OPERATIONAL MANUAL Page 113

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DOCUMENT
I 18.40V02 -
Update: 04.09.2019
Page 113
OPERATIONAL MANUAL
Print Quality
(PQ) Defects
Nozzle Area
Puddle
This defect is characterized by a
smooth, parabolic area of non-printing
(missing jets) followed by a column of
printed image exhibiting ink mixing /
cross-contamination. This is caused
by a small puddle or drop of ink in the
nozzle region of the printhead that
prevents ejection of drops. The mass
of
ink
eventually
absorbs
into
adjacent
nozzles
causing
color
mixing.
Solution
As
can
be
observed
in
the
accompanying
illustration,
the
missing jets portion of this defect is
self-correcting. With regards to its
evolution into the defect
Cross
Contamination
–
Vertical Bands of
Incorrect Color
, many times Cross
Contamination
will
be
eliminated
during the printing of the next plot.
Print Quality
(PQ) Defects
Dripping Ink
Missing jets followed by a dark spot.
This defect occurs when a droplet of
ink has built up on the nozzle area of
the Printhead, blocking the ejection of
jetted drops. In some cases, ejected
drops can be adding to the mass of
the offending droplet. After a while,
the droplet falls off of the face of the
Printhead and lands on the media,
creating an abnormally large spot.
The build-up of enough ink in the
nozzle area of to create this defect
can be caused by a number of
reasons
including
inadequate
Printhead
maintenance
by
the
Service Station, or the presence of
paper fibers that block nozzles.
Solution
The area of a printhead that is
exhibiting this behaviour should be
adequately cleaned after returning to
the “Capped” state. This occurs 20
seconds after the completion of a print
job. If the problem is a persistent one,
then perform a “level 2 recovery”.