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Verve Hybrid
Horizontal Calibration
Horizontal Calibration checks the bi-directional, left, and right alignment and corrects it by adding or
subtracting the correction value from the default set value. It has to be performed for each print mode,
whichever is
required. Let’s discuss each type of horizontal test one by one.
Bi-direction Calibration
Bi-
directional calibration is performed to achieve dot placement accuracy between the “Left to Right” and
“Right to Left” print sweeps. If the bi
-direction offset value is correct, the Left to Right test print would align
accurately with the Right to Left test print at
“0”
position. In case of error in the Bi-Direction offset, the Left
to Right and Right to Left print would align at some other point on the scale.
The
Bi-direction Calibration
result is shown in the image below:
Fig 47: The Bi-Direction Calibration Output
Based on the above figure, you can notice that the Bi-direction Calibration is good at
“0”
position. The
correction value is
“0”
which means you need not to correct the bi-direction value. Sometimes, the correction
value can either positive or negative. If the correction value is positive, then you need to add it in the current
bi-direction adjust value or subtract the same, if negative.
Left to Right and Right to Left Calibrations
Left to Right Calibration is performed to achieve dot placement accuracy of all colors (Black, Cyan, and Yellow)
with respect to Magenta during the carriage’s left to right print sweep. Similarly, Right to Left calibration is
used to achieve dot placement accuracy during the carriage’s right
to left sweep.
When the position of the test head is correct, then it would align perfectly with the reference color at
“0”
position, indicating that the error position is
“0”
. If the test Print H
ead’s position saved in the system is
inaccurate then it would not align at
“0”
position, but at some other point on the calibration scale. The
position at which the test head aligns perfectly with the reference head, indicates the error in position.