Step 1: Load the printer with the labels for your application. 

Step 2: Power OFF and ON the printer.

Step 3: Press and hold the Feed Button until it flashes quickly two times, then release the Feed Button (it is a flash sequence, you can see one flash, then two quick flashes, after that, release the Feed Button).

Step 4: Allow the printer to complete feeding labels and print sensor profiles.

Now the printer is calibrated.

Step 4: Press the Feed Button and one label should be issued each time.