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Print Quality
HP Designjet 4000/4020 Printer Series Service Manual
3 If the Printer is experiencing bi-directional misalignment problems, the
Alignment Test will show something like this:
Corrective Action
1 Perform a Printhead Alignment, using the same paper type with which you
were experiencing unacceptable image quality, if feasible (some paper
types are not suitable for Printhead Alignment).
Diagnostic Part 2: Printheads & Paper Advance Test
This test is designed to check whether the Printheads and the Paper Advance
Mechanism are working correctly. This part of the Image Quality Test should
not be used to check for color consistency or accuracy.
Banding
If the Printer is experiencing a banding problem, you will see repetitive
horizontal bands within the printed image. Banding can appear as follows:
Light Bands
Gradual
Wave Effect
Dark Bands
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