zenpert 4T520 Series User Manual page 17

Use "Diagnostic Tool" to set the media sensor type and calibrate the selected
9.
sensor. (Start the "Diagnostic tool"  Select the "Printer Configuration" tab  Click
the "Calibrate Sensor" button ) Please refer to section 5.3.
2
Note:
* Please calibrate the gap/ black mark sensor when changing media.
6. Feed the paper, printing side faces
up, through the media sensor and
place the label leading edge onto
the platen roller.
7. Move the media guides to fit the
label width.
8. Close the print head mechanism
with both hands and make sure the
latches are engaged securely.
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