How to set the Gap/Black Mark Sensor as Media Sensor and calibrate the Gap/Black Mark Sensor by directly operating the printer
Follow the instructions below:
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Turn off the printer.
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Press and hold the Pause button, and then turn on the printer.
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For the Black Mark Sensor
Release the button when the LED is lit in green/amber (5 times) after the green LED blinks five times alternately.
For the Gap Sensor
Release the button when the LED is lit in red/amber (5 times) after the green/amber LED blinks five times alternately.
You can also calibrate by using the BPM (Brother Printer Management Tool).