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HP Designjet 4000 Printer Series - How to Clean the Printheads

Introduction

When experiencing print quality problems, it may be necessary to perform a printhead recovery, which often enables printheads to recover from print quality problems). See the Printhead recovery section below for more information.
In some cases it is possible that the printer will not recognize a printhead after it has been installed. This is due to the build-up of ink deposits on the electrical connections between the printhead and the printhead carriage. Under these circumstances it is recommended to clean the printheads electrical connections. Routine cleaning of the connections when there are no apparent problems is not recommended. See the Printhead cleaning section below for more information.

Printhead recovery

To clean the printheads, do the following:
  1. On the printer's front panel, highlight the Ink system icon, and press the Select key.
  2. Using the Arrow keys, scoll to Printheads and press the Select key.
  3. Scroll to Recover printheads and press the Select key.
    Cleaning takes about two to four minutes.

Printhead cleaning

Included with your printer (in the Maintenance Kit box) is a carriage interconnect wiper.
Figure : Carriage interconnect wiper
This should be used for cleaning the electrical interconnects of both the printhead carriage and the printhead, which should be done if the front panel persistently displays the Reseat or Replace message next to the printhead.
  1. Remove a new pre-moistened replacement sponge from its pouch.
    Figure : Pre-moistened sponge
    A supply of sponges is included in the box with the wiper.
  2. Open the carriage interconnect wiper.
    Figure : Opening interconnect wiper
  3. Load the sponge into the carriage interconnect wiper by positioning the sponge on the face of the carriage interconnect wiper with the shorter tab in the locating slot.
    Figure : Loading sponge
  4. Close the carriage interconnect wiper, trapping the sponge in place.
    Figure : Closing interconnect wiper
  5. Open the printhead carriage latch and extract the printhead that has the problem, as indicated on the front panel.
    1. On the printer's front panel, highlight the Ink system icon, and press the Select key.
    2. Scroll to Printheads and press the Select key.
    3. Scroll to Replace printheads now and press the Select key.
    4. Access the printheads.
  6. Insert the carriage interconnect wiper into the printhead slot at the back. Wipe the electrical contacts by inserting the tool between the electrical connections at the back of the slot and the steel spring with the sponge facing away from you and towards the electrical contacts. Try to avoid picking up any ink deposit which may have accumulated on the bottom surface of the slot.
    Figure : Inserting interconnect wiper
      caution:
    If the carriage is left in the central part of the printer for more than seven minutes, it will try to move back to it's normal position in the right-hand end.
  7. Rub the sponge against the contacts with a light force along the entire depth of the flex connector as allowed by the mechanical stop on the tool.
    Figure : Using interconnect wiper
  8. Take special care to clean all contacts thoroughly, including the ones at the lowest point of the connector.
    Figure : Cleaning lower connectors
  9. Using the same sponge, clean the lower strip of electrical contacts on the printhead (unless the printhead is new), avoid touching the upper set of electrical contacts.
    Figure : Cleaning printhead contacts
      caution:
    Do not touch the surface of the printhead containing the nozzles, as they are easily damaged.
  10. After waiting a few moments to allow both connectors to dry, replace the printhead into the printhead carriage.
  11. On completion of the cleaning process, open the carriage interconnect wiper by pulling on the sponge tab.
  12. Remove the soiled sponge from the carriage interconnect wiper.
  13. Dispose of the soiled sponge in a safe place to prevent the transfer of ink onto hands and clothing.
    If the front panel continues to display the Reseat or Replace message, replace the printhead.

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