242 Chapter 5 Print Quality
Print Quality
The test plot consists of six horizontal color bands with a black pattern mask on top of them. Each band
is split in to two horizontal areas corresponding to the die 0 and die 1 for the specific color. The plot is
printed in unidirectional mode at 40ips.
Corrective action
If an fault is found with the encoder strip, replace the Encoder Strip⇒ page 399.
Force Drop Detection
If the Printhead Health test plot (
⇒
page 231) has persistent white point banding in only one color that
cannot be fixed with a recovery, you can use this option to resolve the problem by resetting the nozzle
health data base so that all nozzles are assumed to be correct. After the nozzle health data base has been
reset, the drop detection procedure is started
⇒
page 192.
The normal cause of this white point banding in a single color is the failure of the drop detector to correctly
detect nozzles pot on the printhead.
This tool is also helpful to diagnose a potential failure of the drop detector. The ’force drop detector tool’
displays the number of nozzles out per printhead. If you print the diagnostic plot image, afterwards you
will be able to compare this number detected by the drop detector with the real number of nozzles out
that you see on the printout.
If there is a mismatch on all the colors, this would probably indicate that the drop detector is not working
correctly or is mispositioned. Before replacing the drop detector, perform a 'drop detector calibration'
⇒
(
page 216) to correctly position it. If the failure (miss-match) is still there after the calibration, replace the
drop detector.
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