What is the Image Quality Service Diagnostic Print?
The printer contains a series of internal image-quality tests that help you to diagnose image-quality
defects. These tests are available from the Service Utility menu and are come in several categories:
●
Printhead reliability tests: To identify which Printhead is faulty.
●
Printhead alignment tests: To check any color-to-color and bi-directional misalignment the printer
may have.
●
Printheads and paper advance tests: To check whether the Printheads and the paper advance
mechanism are working correctly.
The following diagnostic prints are available:
1. Image Quality Service Best: This plot helps you to diagnose in more detail the possible
source of any image-quality defects.
2. Image Quality Service Normal: This plot is the same as the Image Quality Service Best Plot
but uses the Normal print mode and does not contain the Printhead Alignment test. This plot can
be used to find banding that would be hidden if the Best plot was used.
3. Image Quality Service Fast: This plot is the same as the Image Quality Service Best Plot but
uses the Fast print mode and does not contain the Printhead Alignment test. This plot can be used
to find banding that would be hidden if the Best plot was used.
4. Advanced diagnostic prints. These tests provide more information than the Image Quality
plots:
●
Visual Alignment Print, to check printhead alignment.
●
Visual Media Advance, to check paper advance.
●
Force Drop Detection, to reset the nozzle health historic data base and force new drop
detection.
●
Paper Advance Sensor, which allows the Paper Advance Sensor to be disabled and forces
the advance control to use the analog encoder system. The Paper Advance sensor will
operate again after the printer has been restarted.
5. Print Reference Plot Best
6. Print Reference Plot Normal
7. Print Reference Plot Fast
Considerations for printing the Diagnostic Print
1. You must have paper loaded.
2. Use the same type of paper on which the image-quality problem occurred.
3. If the customer is using non-HP paper and after the Image Quality Test you still have the same
image-quality problem, change to genuine HP paper and repeat the Image Quality Test.
4. If you do not see any problems with the Image Quality Test, then the problem may not be with the
printer itself. The problem may be with the RIP or the driver, for example.
However, if you do see problems with the Image Quality Test, then continue with the Advanced
Diagnostic procedures, which will help you to diagnose the problem.
152 Chapter 7 Print quality ENWW
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