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Determining the Media Step Correction Factor
Introduction
When you print on roll media, there can be discrepancies in the amount the media advanced
during each print swath. This is referred to as media stepping. It can cause banding to occur, in
the form of either dark lines or white gaps. The figure below illustrates this banding.
[54] Media Advance Banding
• A) Understep can result in dark lines, where the media has not advanced enough and the
placement of a swath overlaps the prior swath. This requires a higher correction factor.
• B) Overstep can result in white gaps, where the placement of a swath is displaced a significant
distance away from the prior swath. This requires a lower correction factor.
• C) Perfect Step, where media advances correctly. This requires no change.
Purpose
The Media Step Correction Factor allows the operator to fine-tune media stepping and to
optimize print quality.
When to do
This is only required when this particular banding occurs. If you don't see any banding in your
images, there is no need to change the value from its default setting of 50.
Before you begin
It is critical to load the media so that the media edge on the feed and take-up rolls are aligned
within 1mm.
Using the Media Step Correction Factor: In the 'Roll Media Manager' menu you can select the
field Step Correction and enter a value from 0 to 100. The default value is 50. You can enter a
lower value to correct for white gaps or raise the value to correct for dark lines.
Procedure
1.
Put several instances of the Media Step Correction print in the print queue.
2.
Print with a default Step Correction of 50 (adjusted in Roll Media Manager).
3.
If white lines appear, the media is overstepping. Gradually decrease the Media Step Correction
Factor until the white lines start to disappear. Make a note of the Media Step Correction value.
Continue to decrease the value until dark lines just start to appear, and note the value. Typically,
the average of these two is the ideal Media Step Correction Factor for this media.
4.
Similarly, if dark lines appear lines appear, the media is under-stepping. Gradually increase the
value until the dark lines start to disappear. Make a note of the Step Correction value. Continue to
increase the Step Correction until white lines just start to appear, and note the value. Typically,
the average of these two is the ideal Media Step Correction for this media.
Determining the Media Step Correction Factor
102 Chapter 6 - How to Operate the Roll Media Option