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HP Designjet 400 Series Printers - Ready + Cartridges + Data Lights are On Steady

Issue:
A mark encoder error has occurred and is displayed on the printer's front panel by the Ready + Cartridges + Data lights being on steady.
Solution
Follow the steps below:
  1. Ensure that the printer is turned on, and that initialization has been completed.
  2. Remove any media that may currently be loaded in the printer.
  3. Open the center cover.
  4. Locate the cover sensor assembly.
      note:
    The cover sensor assembly is located inside a vertical rectangular cutout on the right-hand edge of the front panel display assembly.
  5. Use a pen, pencil, or folded piece of scrap paper to depress the cover sensor that is located in inside the cover sensor cutout.
      caution:
    When manually tripping the cover assembly, the carriage assembly may move with little to no warning. Please keep all objects (hands, hair, clothing, etc) out of the carriage path while working with the cover sensor tripped.
  6. Look for the Mark Encoder tab (small white tab) on the left end of the paper drive roller. If you do not currently see the Mark Encoder tab, or if it is visible but not accessible (it is on the bottom side), press the Form Feed button on the front panel of the printer to make the drive roller turn. Continue pressing the Form Feed button until you can verify that the Mark Encoder is present, and it is accessible.
  7. Once the Mark Encoder tab is easily accessible, turn the printer off and then remove the item used to trip the cover sensor.
  8. Using a lint-free cloth (paper coffee filter) moistened with warm water, clean the Mark Encoder tab, as well as the left end of the drive roller.
  9. Locate the encoder strip (not to be confused with the mark encoder). The encoder strip is a thin plastic strip that extends the width of the printer, and it is backed by another thin strip of metal. The encoder strip should be located slightly above and behind the carriage slider rod.
      warning:
    The edges of the encoder strip are sharp. When working on or around the encoder strip, please exercise caution. If you do not feel comfortable working with this item, you may omit the steps related to cleaning the encoder strip.
  10. Using a lint-free cloth (paper coffee filter) moistened with warm water, clean the encoder strip. When cleaning the encoder strip, please pay particular attention to the plastic portion of the strip, as this is the section that is referenced for carriage movement. Make sure to clean both sides of the strip, and the entire length of the strip.
      note:
    The carriage assembly can be moved by hand to access the section of strip that is hidden by the carriage assembly.
  11. Using a dry lint-free cloth (paper coffee filter), dry off the entire width of the encoder strip.
      note:
    Make sure to dry both sides of the strip, and to move the carriage out of the way to dry the portion that is hidden by the carriage.
  12. Visually inspect the entire carriage path (including the sections in behind the end covers) for any signs of obstructions. If any obstructions are found (foreign objects or paper scraps), attempt to remove.
  13. Close the center cover.
  14. Turn the printer on, and attempt to verify functionality.
  15. If the problem persists, contact HP.
Click here for information on contacting HP support at http://h20000.www2.hp.com/bizsupport/TechSupport/CallHP.jsp?locale=en_US&docIndexId=179680&taskId=101&prodTypeId=18972&prodSeriesId=25301.

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