Media With No Label Length Indicators; Media With Underside Horizontal Black Marks; Media With Gaps, Notches Or Holes; Media With Gaps - Printronix Auto ID T800 Series Administrator's Manual

Calibrating the Media Sensors

Due to manufacturing differences in media, the media sensors may have difficulty differentiating between
the label and the liner or the label and the black mark. When this occurs, the printer may intermittently skip
a label or display a fault message such as "GAP NOT DETECTED" or "PAPER OUT".
Media sensor sensitivity and reliability can be improved by changing the Sensors > Control > Gap/Mark
Thresh and/or Sensors > Control > Paper Out Thresh values. You can change these values manually or
automatically by performing an Auto Calibrate
Calibrate menu section. (The changes take effect immediately within the current configuration menu.)
Auto or Manual Calibrate is completed successfully when the displayed Sensed Distance value correctly
matches that of the installed media. When Gap is selected, the Sensed Distance should match the length
from the trailing edge of one gap to the trailing edge of the next gap (or one label + one gap). When Mark is
selected, the Sensed Distance should match the length from the leading edge of one black mark to the
leading edge of the next black mark.
When you have completed Auto or Manual Calibrate, you can verify the new values are correct by pressing
the FEED key several times. Each time you press FEED, media advances one label and stops at the
correct Top-of-Form position of the next label.
Once you confirm the correct values, save them to the desired configuration menu before powering off the
printer.
Running Auto Calibrate
You can initiate Auto Calibrate via the Home Screen ICON
Settings section.
NOTE: Verify that the Gap/Mark Sensor option (Gap, Mark, or Disable) matches the installed media.
Check that the media sensors are horizontally positioned to permit sensing of the label length
indicators. See Positioning the Media Sensors.
Make sure the Media > Image > Label Length value matches the physical length of the installed
media. Entering the correct length forces the printer to advance media far enough during
calibrate for long labels (so actual gaps, notches, and marks can be detected) and reduce the
amount of media advanced for short labels.
If you try to do an Auto Calibrate
display "CANNOT CALIBRATE" error. Before you can do an Auto Calibrate, you must select
another media handling mode.
1. Press the PAUSE key to place the printer OFFLINE (Home Screen).
2. Select the Calibrate
3. Media advances until it can accurately detect the label length indicators and then stops at the
Top-of-Form position. The Sensed Distance value will then display for one second.
4. Auto Calibrate is successful when the Sensed Distance value correctly matches that of the installed
media:
Gap/Mark Sensor = Gap: The Sensed Distance value is the physical length of one label plus the
length of one gap, notch, or hole.
Gap/Mark Sensor = Mark: The Sensed Distance value is the physical distance from the leading edge
of one black mark to the leading edge of the next black mark.
Gap/Mark Sensor = Disable: Not applicable. If Gap/Mark Sensor is set to Disable, the Sensed
Distance value will not be updated.
If "GAP NOT DETECTED" displays, run Auto Calibrate again.
when Peel-Off Media Handling is enabled, the LCD will
ICON and press the ENTER key.
or Manual Calibrate procedure from the Sensors >
or via the Sensors menus within the
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