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HP Designjet L25500 Printer Series - Clean the electrical connections on a printhead

Clean the electrical connections on a printhead
It is possible that the printer will not recognize a printhead after it has been installed. This can happen when ink builds up on the electrical connections between the printhead and the printhead carriage. Under these circumstances, HP recommends that you clean the electrical connections on the printhead. However, routine cleaning of the connections when no problems are apparent is not recommended.
A carriage interconnect wiper is included with your printer in the User Maintenance Kit.
Figure : Carriage interconnect wiper
Use this to clean the electrical interconnects on both the printhead carriage and the printhead if the Reseat or Replace message persists next to the printhead on the front-panel display.
  1. Remove a new pre-moistened replacement sponge from its pouch.
    Figure : Removing the wiper sponge from its pouch
    A supply of sponges is included in the box with the wiper. If all sponges have been used, more can be obtained by calling your service representative.
  2. Open the carriage interconnect wiper.
    Figure : Opening the carriage interconnect wiper
  3. Load the sponge by positioning the sponge on the face of the carriage interconnect wiper with the shorter tab in the locating slot.
    Figure : Loading the sponge into the wiper
  4. Close the carriage interconnect wiper, trapping the sponge in place.
    Figure : Closing the carriage interconnect wiper
  5. Open the printhead carriage latch and extract the printhead that is causing the problem, as indicated on the front panel.
  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 that may have accumulated on the bottom surface of the slot.
      caution:
    If the carriage remains in the central part of the printer for more than 7 minutes, it attempts to return to its home position to the right.
    Figure : Inserting the carriage interconnect wiper
  7. Rub the sponge against the contacts with a light force along the entire depth of the flex connector, inserting the wiper as far as allowed by the mechanical stop on the tool.
    Figure : Cleaning the electrical interconnect
  8. Take special care to clean all contacts thoroughly, including the ones at the lowest point of the connector.
    Figure : Cleaning the bottom of the interconnect
  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 the electrical contacts on the printhead
      caution:
    Do not touch the surface of the printhead that contains the nozzles, because the nozzles are easily damaged.
  10. After waiting a few moments to allow both connectors to dry, replace the printhead into the printhead carriage.
  11. After completing the cleaning process, open the carriage interconnect wiper by pulling on the sponge tab.
    Figure : Opening the carriage interconnect wiper
  12. Remove the soiled sponge from the carriage interconnect wiper.
    Figure : Removed the soiled sponge from the wiper
  13. Dispose of the soiled sponge in a safe place to prevent the transfer of ink onto hands and clothing.
    Figure : Disposing of the soiled wiper sponge
If the front panel continues to show the Reseat or Replace message, replace the printhead or call your service representative.

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