SATO CL4NX Operator's Manual page 319

7 Appendix
CAUTION
For the CL4NX RFID model, the position of the I-mark sensor becomes a minimum of 0.3 mm (0.01") when
the position of the gap sensor is adjusted to around 7.3 mm (0.3"). Because of this, the paper end may be
frequently detected when Paper End in the Printing > Advanced menu is set to Using I-mark (the default),
due to the shifting of the media or other causes. When you have adjusted the position of the Gap sensor to
around 7.3 mm (0.3"), change Paper End to Using Gap.
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CL4NX/CL6NX Operator Manual