Zebra GX420d feed blink sequence

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1. Print Configuration Status
2. Auto Media Calibration
3. Reset Serial Port Configuration
4. Reset to Factory Defaults (release and within 2 seconds hold for 1 blink to Reset Network).
5. Set the printer print width
6. Set the printer darkness
7. Perform Manual Calibration and print Sensor profile

Zebra ZD620 – Media calibration

press and hold the PAUSE and CANCEL button for 2 seconds and release.