2. When the electric eye falls on the label, the current value of red is 4.

3. Adjust the "set value", which is about 1/2 of the sum of the value of the electric eye falling on the backing paper (between the detected object and the detected object) and the value of the electric eye falling on the label (on the detected object), and the "set value" is (144+4)/2=74. Adjust the "manual button" to set the "set value"

4. Move the label or the gap position (on the detected object) back and forth at the detection place of the electric eye, and whether the red "signal light/indicator light" can be displayed normally at this time.