Zebra Technologies XiIII - Manual (Page 16)

Positioning the Media Sensors
The correct positioning of the media sensors is important. It can make the
difference between a perfect label and a call to Technical Support!
Transmissive Sensor
The web or gap sensor, better known as the “transmissive sensor,” detects
the gap between labels.
The transmissive sensor actually consists of two sections: a light source
(the lower media sensor) and a light sensor (the upper media sensor). The
media passes between the two.
The upper media sensor must be positioned:
n Directly over the hole or notch, or
n Anywhere along the width of the media if there is a gap between labels.
NOTE: If you are using continuous media, position the upper media sensor
over the media so that the printer can detect an out-of-paper
condition.
10 Zebra XiIII-Series User’s Guide