HP Designjet 4520 Printer series - Manual (Page 128)

Print the Image Diagnostics Print
The Image Diagnostics Print consists of patterns designed to highlight print quality problems. It helps
you to check whether you have a print quality problem, and if you have, what the cause of the problem
is and how to resolve it.
Before using the Image Diagnostics Print, check that you have been using appropriate print quality
settings (see
Choose print quality settings on page 57 ).
To print the Image Diagnostics Print:
1. Ensure that you have paper of at least A3 size (29.7 × 42 cm = 11.7 × 16.5 in) loaded into the
printer. Use the same paper type that you were using when you detected a problem.
2. Ensure that the front panel has the same print quality settings that you were using when you
detected the problem (see
Change the print quality on page 57 ). In the Image Diagnostics Print,
the only difference between drawings/text and images is that the latter uses more ink in part 2,
so that the colors appear darker.
To print the Image Diagnostics Print will take about two minutes if you choose images; sometimes
less if you choose drawings/text (depending on the paper type).
3. At the printer's front panel, select the icon, then Internal prints > Image diagnostics prints
> Optim. for drawings/text or Optimize for images.
When the print is ready, see Respond to the Image Diagnostics Print on page 118 .
Respond to the Image Diagnostics Print
The Image Diagnostics Print is in three numbered parts.
1. Part 1 tests printhead alignment. See Interpret Image Diagnostics part 1 on page 118 .
2. Part 2 tests printhead performance and the paper advance mechanism. See Interpret Image
Diagnostics part 2 on page 119 .
3. If Part 2 has revealed a printhead problem, Part 3 identifies which of the eight printheads is
responsible for it. See
Interpret Image Diagnostics part 3 on page 121 .
If Part 2 has not revealed any problem, you can and should ignore Part 3.
Interpret Image Diagnostics part 1
The purpose of part 1 is to identify color-to-color alignment and bidirectional alignment problems.
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