Print Quality
6-25
HP DesignJet 5000 and 5500 Series Printers Service Manual
See the following image:
Cause:
Before going to the root cause, we have to understand two main
concepts of the inkjet technology:
1 The dye ink is made by a liquid and pigments (which, in fact,
delivers the color to the ink).
2 This ink is contained on the printhead nozzles.
3 An internal heating process eject the drops of ink that are delivered
though these nozzles.
Therefore, during the normal printing process, the printer is firing
the drops of ink over the media by heating the ink that is contained
on the nozzles.
The cause of the issues is that, when the nozzles are on the resting
state for some time, the liquid of the ink evaporates. We have two
different cases:
1
If the resting state is not very long, the water of the ink only
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