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HP Designjet T790 and T1300 ePrinter Series - Align the printheads

Precise alignment between printheads is essential for accurate colors, smooth color transitions and sharp edges in graphical elements. Your printer has an automatic printhead alignment process which runs whenever a printhead has been accessed or replaced.
In cases where the paper has jammed or you are experiencing problems with color accuracy, see Color managementColor management; you may need to align the printheads.
  note:
If the paper has jammed, it is recommended that you reinsert the printheads and initiate the realignment procedure by pressing , then , then Image Quality Maintenance > Align printheads.
  caution:
Do not use transparent or semi-transparent paper to align the printheads.
Reinsert printheads procedure
  1. If the realignment process is running and the wrong paper is loaded, press on the front panel.
      caution:
    Do not print if the realignment process has been canceled. You can restart the alignment by pressing , then , then Image Quality Maintenance > Align printheads.
  2. Load the paper you wish to use, see Paper handlingPaper handling. You can use a roll that is at least 610 mm wide or a cut sheet that is A2 landscape or larger.
      caution:
    Do not use transparent or semi-transparent paper to align the printheads.
  3. Remove and re-insert all the printheads, see Remove a printheadRemove a printhead and Insert a printheadInsert a printhead. This starts the printhead alignment procedure.
  4. Ensure the window is closed, as a strong light source near the printer during printhead realignment can affect alignment.
    Figure : Closing the window
  5. The process takes about six minutes. Wait until the front-panel display shows the process complete before using the printer.
      note:
    The printer prints a calibration image. Do not worry about the image. The front-panel display shows any errors in the process.
Image Quality Maintenance menu procedure
  1. Load the paper you wish to use, see Paper handlingPaper handling. You can use a roll or cut sheet, however, it must be A3 landscape or larger (420 by 297 mm).
      caution:
    Do not use transparent or semi-transparent paper to align the printheads.
  2. From the front panel, press , then , then Image Quality Maintenance > Align printheads. The printer checks to see if it has enough paper to run the realignment.
  3. If the loaded paper is satisfactory, the printer runs the realignment and prints a realignment pattern. Ensure the window is closed, as a strong light source near the printer during printhead realignment can affect alignment.
    Figure : Closing the window
  4. The process takes about five minutes. Wait until the front-panel display shows the process complete before using the printer.
Scanning errors during alignment
If the alignment process fails, a Scanning problems message appears on the front panel. This means that the alignment has not completed successfully. Therefore the printer is not aligned and the alignment should be repeated before printing with good image quality. The problem may be due to:
  • The paper used was not valid, repeat the alignment with valid paper
  • Printhead health problems, clean printheads, see Clean the printheadsClean the printheads
  • The alignment was done with the window open, repeat the alignment with the window closed
If the problem persists after using valid paper, cleaning the printheads and keeping the window closed, there may be a failure in the scanning system needing repair; or the printheads, although clean, may not work and need to be replaced.

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