Follow the instructions below:

1. Turn off the printer.


2. Press and hold the Selection button, and then turn on the printer.


3. For the Black Mark Sensor
   Release the button when Bline Calibration appears on the Touchscreen.
   The LED color will change in the following order:
   Amber > red (5 times) > amber (5 times) > green (5 times) > green/amber (5 times) > red/amber (5 times) > green (lit)
   
   For the Gap Sensor
   Release the button when Gap Calibration appears on the Touchscreen.
   The LED color will change in the following order:
   Amber > red (5 times) > amber (5 times) > green (5 times) > green/amber (5 times) > red/amber (5 times) > green (lit)