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HP Designjet Z2600ps

Diagnostic Part 1: Printhead Reliability

The Nozzle Print Test is designed to check if the Printhead nozzles print correctly.

The nozzles (bottom of the plot) are printed in a one-pass full swath mode. The diagnostics test prints out every single nozzle of each Printhead without applying an error hiding or alignment algorithm.

For each Printhead, you can see both the adjacent and the consecutive nozzles.

If any nozzles are not printing correctly they will be shown on the right of each Printhead Nozzle test. There is a series of numbered stepped diagonal lines. If one or more of the nozzles are clogged, malfunctioning or mispositioned, you will see that the stepped lines are broken or misdirected in one or more places.

Below, the stepped lines highlighted in yellow are broken. When the line is completely broken, this means the nozzle is out.

Below, the stepped lines highlighted in yellow are misdirected. When the line is misdirected, this means the nozzle is malfunctioning or out of position.

On the left of each Printhead Nozzle test, there is a series of horizontal straight lines. If one or more nozzles are misdirected there will be unequal spaces between the corresponding lines.

Corrective Action

If the printer has nozzle defects, you can still get perfect print quality results. The printer can automatically compensate for nozzle defects, so there is no need to replace the Printhead.

The method of improving Nozzle Defects is to:

  1. Recover the Printheads, using the Front Panel. Press "arrow down", then "wrench" and then select Image Quality Maintenance/ Clean Printheads.
  2. Reprint the Printhead Nozzles Test Plot to verify that the defective nozzles have been corrected.
  3. If the problem continues, replace the defective Printhead.
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