Zebra Technologies T402 - Manual (Page 32)

Auto Calibration
NOTE: If you are using pre-printed labels, pre-printed label
backing, or continuous media, see
“Manual Calibration” on
page 34.
An auto calibration is performed when the printer is turned on (if media is
loaded) or after an error is cleared. When it is auto calibrating, the printer
sets the sensor levels for, and determines the length of, the label you are
using.
If the status LED flashes red, refer to “Manual Calibration” on page 34.
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