AMT Datasouth M1 - Manual (Page 11)

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5. Close the top cover gently and make sure the cover latches securely.
6. Use “Diagnostic Tool” to set the media sensor type and calibrate the selected sensor. (Start the
“Diagnostic tool” Select the “Printer Configuration” tab Click the “Calibrate Sensor”
button)
Note: Please calibrate the gap/black mark sensor when changing media.