Each side of the plot gives a different error. Usually the error on each side is symmetric to zero (Eg: A=- 4, B=
+4). To evaluate the error, compute the difference between B-A.
●
If B-A is less than 7, then no expected IQ defects.
●
If B-A is more than 7, then there could be grain and less line quality at plot sides.
Where |A-B| is the absolute value (without sign) of A-B. An acceptable error should be comprised below (+/- 4
dots)
Force drop detection
If the Printhead health test plot on page 190 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 stated in
1.5.1 Force drop detection on page 168
The normal cause of this white point banding in a single color is the failure of the drop detector to correctly
detect nozzles out 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
4.2.1 Drop-Detector Calibration
on page 182 to correctly position it. If the failure (miss-match) is still there after the calibration, replace the
drop detector.
Troubleshooting non-uniform curing
Typically most of the non-uniform drying/curing can be corrected by applying the correct profile setting. In
those cases that the profile adjustment does not improve the uniformity of the curing perform the following
troubleshooting procedure.
1. Set up the printer with the recommended profile for the type of substrate used, setting up the curing
temperature at 95°C through the RIP.
2. Send the file CuringTestDark_103x150.tif to the printer, which is considered a worst case to analyze
ink-curing uniformity (the TIFF file is attached to this PDF document).
3. Allow the printer to warm up, and start the printing process.
ENWW Force drop detection 199
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