Printronix Auto ID T400 Administrator's Manual page 19

Note:
* Please calibrate the gap/black mark sensor when changing media.
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4. Place the label leading edge onto the
platen roller. (printing side face up)
5. Close the top cover gently and make
sure the cover latches securely.
6. Use "Configuration Utility" to set the
media sensor type and calibrate the
selected sensor. (Start the
"Configuration Utility"  Select the
"Printer Configuration" tab  Click the
"Calibrate Sensor" button)
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