Citizen CL-E720DT, Technical Manual

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Chapter 2 Operating Principles
2-1.
Operation of Each Mechanism
CL-E720DT
2-6
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2-1-3. Label/Tag Detection Mechanism
The major components of the label/tag detection mechanism are:
(a) SA Ref Sensor PCB (Bottom sensor, Reflective sensor)
(b) SA TRA Sen PCB (Upper sensor, Transparent sensor)
There are two sensors, the reflective sensor (bottom sensor) and the transparent sensor (upper
sensor). As shown in the figure blow, the reflective sensor has two LEDs and one phototransistor.
The reflective sensor is used to detect black marks on the back of tag. On the other hand, the
transparent sensor is a phototransistor that receives the transparent light from the reflective
sensor’s LEDs through the media. The transparent sensor is used to detect labels on liner or
U-shaped notches of tag. Both reflective and transparent sensors are used to detect the media
end.
Aligning the sensors for label paper, and tag with U-shaped notches:
For label paper, align both reflective and transparent sensors at the center of the label. For tags
with U-shaped notches, align both sensors with the U-shaped notch. In both cases, align the arrow
mark of the transparent sensor with the right side mark of the reflective sensor as shown below.
Aligning the reflective sensor for tag with black marks:
For tag with black marks, align the reflective sensor alone with the black mark. In this case, align
the left side mark of the reflective sensor with the black mark as shown below.