Intermec EASYCODER 7421 - Manual (Page 39)

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Adjusting the Label Gap Sensor
The label gap sensor detects the gap between labels while they
are being printed. The gap sensor automatically calibrates itself
when you first turn on power to the printer. This adjustment
compensates for manufacturing differences in label stock that
may make it difficult for the gap sensor to detect the gap
between labels.
To adjust the label gap sensor
1. Turn the printer power off.
2. Turn the printer power on.
The printer Power light flashes yellow and the printer advances
to the next label. When the label gap sensor adjustment is
complete, the Power light stops flashing and turns green.