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HP Designjet 4020 and 4520 Printer Series - Printheads are limiting performance message

This message appears on the front panel during printing when the printer has detected that one or more printheads are not performing optimally, and so it needs to make extra passes to maintain print quality. To eliminate this message, choose one of the following:
  • Select a higher print quality.
  • Clean the printheads.
  • Use the Image Diagnostics Print to identify which printhead is causing the problem.