Designjet Z Series — Service Manual 1-36
Reading the Advanced Diagnostic Print Results
For the thetaZ and VLS diagnostics the dark band of the print is the area to
check. In the following example print the lightest segment of the dark band is
positioned on the -1 column.
If any of the printheads are misaligned beyond the ±1 dot row range,
perform a Printhead Alignment.
see Aligning Printheads, Page 1-66
If a Printhead Alignment does not correct the problem, replace the bad
printhead.
Nozzle Health
The print contains three separate parts.
a The Variable Frequency Nozzle health plot with odd/even nozzles
separation. This is used to detect misdirected or weak nozzles, nozzles
not working correctly at all frequencies, or even Gloss Enhancer (GE)
color problems.
This plot might show defects with the printheads that are not visible in the
Service Image Quality Diagnostic Print. Look at the color bars and lines
If the customer is using non-HP media and after the Image
Quality Test you still have the same image quality problems,
change to genuine HP media and repeat the Image Quality
Test. The best alignment calibration is obtained using HP
Photo Paper.
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