3.2.2
Adjusting the Printer Label Gap Sensor
The built-in printer in the DC-300 has a label gap sensor designed to detect the gap between labels on a label roll.
This allows the printer to identify the starting position of each label so that only one label is issued at a time
during a print operation.
Figure 3-5. Label Gap Sensor
A resistor detects a variation in voltage between the label and the backing paper.
Figure 3-6. Label Gap Sensor Resistor Location
Depending on the material of the label and the backing material of the label roll, labels will have a gap sensor
voltage of between 2.5 V and 5.0 V while the backing material will have a gap sensor voltage of between 1.0 V
and 2.5 V. If the printer begins to misfeed labels, the voltage threshold can be reset as described below.
Threshold Voltage
The sensor needs a threshold voltage (also called a gap reference voltage) at which it can distinguish between a
label and a gap between labels. Any portion on the roll with a gap sensor voltage above the threshold voltage will
be considered by the printer to be a label, while portions of the roll below the threshold voltage will be
considered gaps between labels. The threshold voltage is computed according to the following formula:
Threshold Voltage = (highest detected value + lowest detected value) / 2
The threshold voltage is computed automatically by the scale whenever the
FEED
key is pressed. However, it the
printer is misaligning the labels because it does not accurately detect the gap, the threshold voltage can also be
set manually.
1. At the Stand-by screen, hold down the
REZERO
key while entering
516
to enter the Threshold Voltage
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