Calibrating The Sensitivity Of The Top-Of-Form Sensor - Printronix T5000 Series Quick Reference Manual

Printing Adjustments
In the Transmissive Mode, position the sensor directly under the
inter-label gap, hole or notch, while in the Reflective mode position
it as close as possible in the middle of the label black stripe. For
media with no gap and no black stripe, the sensor should be set
under the media to detect a paperout condition.
When using Top-of Form sensor, you must use the media specified
in Appendix A of the User's Manual to ensure that the Label Length
value set in the MEDIA CONTROL Main Menu (or Label Length
value sent via software command) matches the physical length of
the label or tag stock installed in the printer. Perform the Top-of-
Form sensor calibration procedure described below whenever a
different type of media sensing will be required (Transmissive or
Reflective), when installing never-before-tried media, or when the
printer is experiencing loss of Top-of-Form position. Loss of Top-of-
Form is usually followed by an error message on the LCD, such as
"GAP NOT DETECTED See Manual" or "PAPER OUT Load
Paper."
Calibrating the Sensitivity of
the Top-of-Form Sensor
Due to manufacturing differences in transmissive and reflective
label stock, the Top-of-Form sensor may have difficulty
distinguishing the difference between the label and the liner (gap)
or the label and the black stripe. When this occurs, the printer will
display an error message on the LCD such as "GAP NOT
DETECTED See Manual" or "PAPER OUT Load Paper." The
printer's sensitivity for detecting the TOF (Top-of-form) position of
the media installed can be optimized by using the Paper Calibrate
features in the MEDIA CONTROL menu.
Top-of-Form sensor sensitivity can be improved by changing the
Gap Threshold and/or Paper Out Threshold. These values can be
changed manually within the MEDIA CONTROL menu, or can be
determined automatically using the Run Calibrate procedure.
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