When enter the [Continuous] option, you will see following message.
Insert label ...
Then hit Enter
V
Insert media between the gap sensor and press the 
button under “V” icon to
start sensor calibration
Calibrate 50
+ - V
Press the 
button under “+” and
Stock AD value, and press the 
under “V” icon to detect sensor sensitivity.
Calibrating ...
Stock AD = 256
SUCCESSFUL
Stock AD = 50
Press the 
button under “” icon to return to the next higher menu.
If “FAILED” is shown on the LCD display, please check if the media is placed between the see through type gap sensor.
FAILED
Stock AD = 50
If yes, please follow the following steps to calibrate sensor sensitivity agian.
1.Press the button 
under “” icon to return to “Sensor” menu.
2.Press the button 
under “]” icon to enter “Continuous” menu.
3.After insert label between the see through type gap sensor, press
the button 
under “V” icon to continue.
4.Press the button 
under “+” icon to increase Stock AD value by
50 levels. Press the button 
under “V” icon to calibrate the sensor
32