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HP Designjet 8000s Printer Series - Calibrations and adjustments

Overview

Mechanical and electrical settings of the printer can be adjusted based on a series of printed patterns. These patterns allow to calibrate the printer settings for the media being used. Based on the results of these patterns, printer performance can be optimized.

Calibrate media advance

The printer was calibrated at the factory to ensure that it advances the media accurately when using supported media types in normal environmental conditions. However, you may find it useful to recalibrate in certain circumstances:
  • Unsupported media: Different media manufacturers provide media types with a wide range of properties such as media thickness or stiffness, which may benefit from calibration. You can expect the best print quality when using HP's recommended media types.
  • Abnormal but stable environmental conditions: If you are printing in unusual conditions of temperature or humidity, and those conditions are expected to remain stable, recalibration may be worthwhile.
However, media advance calibration assumes that you have an image quality problem and that you have already followed the appropriate troubleshooting procedure for that problem. If you have no particular problem, there is no need to perform the calibration.
note:
This procedure describes media advance calibration for all media loaded in the printer. If you need to calibrate media advance for a specific media only, then define advance using the MEDIA REG option.
Follow the steps given below:
  1. Load media widths larger than A1 size and longer than 1 meter.
    note:
    If you intend to use TENSION winding on the take-up reel, set media advance in tension winding mode.
    A longer print length is required in the tension winding mode.
  2. Press the ONLINE key.
    Figure : Front panel menu
  3. Select M_ADV using the (Right arrow) key.
    Figure : Front panel menu
    Select MEDIA ADV PRINT and press OK.
    Select the print mode you usually use for the media you are calibrating.
    Selectable print modes are:
    • NORMAL - Standard and high speed print modes (720 x 720 dots per inch (dpi) - 8 passes).
    • H-QUAl - High quality print mode (720 x 720 dpi - 16 passes).
    • H-DENS - High density print mode (720 x 720 dpi - 16 passes).
    • DRAFT - Draft print mode (360 x 720 dpi - 4 passes).
    • FINE DRAFT - Fine draft print mode (540 x 720 dpi - 6 passes).
    • 3 TIMES - High quality, high density print mode (720 x 720 dpi - 24 passes).
  4. Press the (Up arrow) and (Down arrow) keys to select the ROUGH print mode, and press the OK key.
    Figure : Front panel menu
  5. Press the OK key to print the pattern.
    Figure : Front panel menu
    In this example, the color is black.
    Figure : Printing the pattern
    Five patterns are printed in 0.5% percent steps in a range of 99.00% percent to 101.00% percent.
    1. Dark lines are visible, the value is too low.
    2. No lines are visible, the value is correct.
    3. Light lines are visible, the value is too high.
    note:
    Select a mean value if the media advance value is different in every color. If you have an image that uses one particular color, then set the value based on that color.
    Different values between the left and right sides of the media may be caused by skew.
  6. From the printed result, select the best media advance calibration value.
  7. Press the (Down arrow) key, and then the OK key to display the current media advance calibration value.
    Figure : Front panel menu
  8. Enter the media advance calibration value, and press the OK key.
    Select the number you want to change by using the (Left arrow) and (Right arrow) keys and change the numeric value using the (Up arrow) and (Down arrow) keys.
    If you need more precise media advance calibration, then you will need to print the DETAIL pattern as follows:
  9. Press the (Down arrow) key, and then the OK.
    Figure : Front panel menu
  10. Press the (Up arrow) and (Down arrow) keys to select the DETAIL pattern.
    Figure : Front panel menu
    Select the same print mode as for the ROUGH pattern you printed previously.
  11. Press the OK key twice to print the DETAIL pattern.
    Figure : Front panel menu
  12. From the printed result, select the best media advance calibration value.
    Five patterns are printed in 0.10% percent steps in a range of -0.20% percent to +0.20% percent .
  13. Press the (Down arrow) key, and then the OK key to display the media advance calibration value.
    Figure : Front panel menu
  14. Enter the media advance adjustment value, and press the OK key.
    Set a numeric value with (Up arrow) and (Down arrow) keys.
    note:
    Select a mean value if the media advance value is different in every color. If you have an image that uses one particular color, then set the value based on that color.
    Set a mean value if the media advance value differs between the left and right sides of the media.
    Different values between the left and right sides of the media may be caused by skew.
  15. Press the OK key to confirm.

Printhead position adjustment

Use the printhead print position test patterns to calibrate the following printhead positions:
  • Printhead to printhead position - adjusts the printhead position for the scan axis using the black printhead as a reference.
  • Bidirectional printing position.
Do the following to print the printhead to printhead position pattern:
  1. In the TEST PRINTS menu scroll to the PH TO PH option and press the OK key.
    Figure : Front panel menu
  2. Press the OK key to start printing.
    Figure : Printhead position pattern
Do the following to set the printhead to printhead adjustment value:
  1. Select ADJUST and press the OK key.
  2. Select YY PH TO PH VAL and press the OK key.
  3. Select the printhead color to be adjusted, and press the OK key.
  4. In the printhead adjustment pattern, identify the value where the vertical black line and the color printhead lines are perfectly aligned. In the image below, the correct value for Lc is +2.
    Figure : Printhead adjustment pattern
  5. Insert the value and press OK key.
    Select the number you want to change by using the (Left arrow) and (Right arrow) keys and change the numeric value using the (Up arrow) and (Down arrow) keys.
  6. Use the same procedure to adjust the other colors.
Do the following to print the bidirectional printing position pattern:
  1. In the TEST PRINTS menu scroll to the BIDIRECTION DEF option and press the OK key.
    Figure : Front panel menu
  2. Press the OK key to start printing.
    Figure : Bidirectional printing
Follow the steps given below to set the bidirectional printing adjustment:
  1. Select ADJUST and press the OK key.
  2. Select BIDIRECTION DEF and press the OK key.
  3. Select the printhead color to be adjusted, and press the OK key.
  4. In the printhead adjustment pattern, identify the value where two vertical lines for the same printhead are aligned. In the image below, the correct value for M is -8.
    Figure : Setting the bidirectional printing adjustment
  5. Insert the value and press OK key.
    Select the number you want to change by using the (Left arrow) and (Right arrow) keys and change the numeric value using the (Up arrow) and (Down arrow) keys.

Printhead nozzle position adjustment

Use the printhead nozzle position test patterns to calibrate the printhead nozzle positions.
Do the following to print the printhead nozzle position pattern:
  1. In the TEST PRINTS menu scroll to the NOZZLE POS ADJ option and press the OK key.
    Figure : Front panel menu
  2. Press the OK key to start printing.
      Figure : Printhead nozzle position pattern
    1. Use this section to identify the printhead nozzle to be used as the reference.
    2. Use this section to determine the correction value for the other printheads.
  3. Identify the line of the printhead nozzle closest to the print platen (indicated as 1 in the image below). In this example, the printhead nozzle (that is closest to the print Platen) to be used as the reference is indicated as 2 in the image below.
      Figure : Printhead nozzle position adjustment
    1. Line of the printhead nozzle
    2. Printhead nozzle closest to the print Platen
  4. For each printhead line, identify the value where the reference printhead is aligned. In this example image, for the Magenta line the correction value is 1 (indicated as 1 in the image below).
      Figure : Printhead lines
    1. Printhead line
Follow these steps to set printhead nozzle position adjustment values:
  1. Select ADJUST and press the OK key.
  2. Select NOZZLE POS VAL and press the OK key.
  3. Select the printhead color to be adjusted, and press the OK key.
  4. Insert the value and press OK key.
    Select the number you want to change by using the (Left arrow) and (Right arrow) keys and change the numeric value using the (Up arrow) and (Down arrow) keys.

Line sensor position adjustment

This test pattern is used only for HP Support purposes to calibrate the line sensor.

Back feed adjustment print

This option prints a pattern so that you can adjust how much back feed is applied to a media type that you are loading.
  1. Press the ONLINE key.
    Figure : Front panel menu
  2. Press the (Right arrow) key, and select BACK ADJ PRINT and the OK key.
    Figure : Front panel menu
    Select the print mode you usually use for the media that you are calibrating.
    Select the NORMAL media feed adjustment print if adjusting the high speed mode.
Select a parameter based on the print mode.
Parameters:
  • NORMAL - Standard and high speed print modes (720 x 720 dpi - 8 passes).
  • H-QUAL - High quality print mode (720 x 720 dpi - 16 passes).
  • H-DENS - High density print mode (720 x 720 dpi - 16 passes).
  • DRAFT - Draft print mode (360 x 720 dpi - 4 passes).
  • FINE DRAFT - Fine draft print mode (540 x 720 dpi - 6 passes).
  • 3 TIMES - High quality, high density print mode (720 x 720 dpi - 24 passes).

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