You can set the sensor to either reflective or transmissive.
For the printer to maintain a constant print position it uses the transmissive sensor to detect the gap
between labels by measuring the amount of light passing through the media. When the media is preprinted,
the darker (or more dense) inks can interfere with this process causing paper jam errors. To get
around this problem a minimum threshold can be set for the sensor in the following way.
(1) The printer is in stand-by.
(2) Load a media roll in the usual way.
(3) Press the [PAUSE] key.
(4) The printer enters the pause mode.
(5) Press and hold the [PAUSE] key for at least 3
seconds in the pause state.
(6) The sensor type is displayed.
(7) Press the [FEED] key.
(8) The reflective sensor (black mark sensor) is selected.
(9) Press the [FEED] key again.
(10) The transmissive sensor (feed gap sensor) is selected.
(11) Press and hold the [PAUSE] key.
(12) The media is advanced until the [PAUSE] key is
released.
(13) Release the [PAUSE] key when more than 1.5 labels
(tags) are advanced.
(Threshold setting is completed by this operation.)
(14) Press the [RESTART] key.
(15) The printer is in stand-by.
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