HP Designjet T620 Printer series - Manual (Page 122)

Recalibrate the paper advance
Accurate paper advance is important to image quality because it is part of controlling the proper
placement of dots on the paper. If the paper is not advanced the proper distance between printhead
passes, light or dark bands appear in the print and image grain may increase.
The printer is calibrated to advance correctly with all the papers appearing in the front panel. When you
select the type of loaded paper, the printer adjusts the rate at which to advance the paper while printing.
However, if you are not satisfied with the default calibration of your paper, you may need to recalibrate
the rate at which the paper advances. See
Troubleshooting print-quality issues on page 121 for steps
to determine if paper advance calibration will solve your issue.
You can check the paper advance calibration status of the currently loaded paper at any time by pressing
the
View loaded paper key on the front panel. The status may be one of the following.
● DEFAULT: This status appears when loading any paper that has not been calibrated. HP papers
in the Front Panel have been optimized by default and unless you experience image quality
problems in your printed image such as banding or graininess it is not recommended to recalibrate
the paper advance.
● OK: This status indicates that the loaded paper has been calibrated before. However you may need
to repeat the calibration if you experience image quality problems such as banding or graininess
in your printed image.
NOTE: Whenever you update the printer’s firmware, the paper advance calibration values are
reset to factory default, see Update the firmware on page 101 .
CAUTION: Transparent papers and films must be calibrated using Image Quality Maintenance menu
icon , then Paper advance calibration > Adjust paper advance, from step four in the Recalibrating
the paper advance procedure.
Recalibrating the paper advance procedure
1. Press the Menu key to return to the main menu and select the Image Quality Maintenance menu
icon , then Paper advance calibration > Calibrate paper advance. The printer automatically
recalibrates the paper advance and prints a paper advance calibration image.
2. Wait until the front panel displays the status screen and re-print your print.
NOTE: The recalibration procedure takes approximately three minutes. Do not worry about the
paper advance calibration image. The front-panel display shows any errors in the process.
If you are satisfied with your print continue using this calibration for your paper type. If you see
improvement in your print, continue with step three. If you are dissatisfied with the recalibration,
return to the default calibration, see
Return to default calibration on page 120 .
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