Recalibrating Zebra ZD420/421 Media Sensor

The Media Sensor detects the length of a label and the gap between labels and may need to be cleaned or calibrated from time to time or when changing to a different brand/ type of label. To clean, gently wipe the top of the sensor with a damp cloth. Ensure the sensor is positioned left to right in a position that the center of the labels will pass over it. If this does not resolve the problem, follow the steps below to recalibrate the sensor.

Calibrating The Media Sensor

1. Your media must be loaded and the printer power on.
2. Press Pause button for 2 seconds to enter advanced mode.
3. The status indicator will show solid yellow when ready.
4. Press Pause button to start the manual media calibration process.
5. The media indicator will flash yellow then the pause indicator will flash.
6. Open the printer and remove a few labels from the liner & place the liner where the labels were removed directly above the movable sensor.
7. Close the printer and press pause once.
8. The media indicator will flash as the media liner is measured.
9. When complete the pause indicator will begin flashing.
10. Open the printer and reposition the media so a label is directly positioned above the movable sensor.
11. Close the printer and press pause once.
12. The printer will feed and measure several labels.
13. The printer will return to a ready state when complete with a green status indicator.