SM-300 Service Manual
37
4.2 Adjustment
4.2.1 Location Of Label Gap Sensor And Thermal Head
4.2.2 Label Gap Sensor
Adjust this variable resistor for sensor
level sensitivity.
The label sensor is to detect the gap between the labels
so as to identify the starting position of the label. If the
gap is not detected properly, the scale will issue two or
more labels. Also different material of label and back
paper will have different sensitivity level; the variable
resistor beside the label sensor is to adjust the
sensitivity to suitable level.
Gap Sensor Voltage
a) When the sensor detects a gap (back paper), the Gap Sensor Voltage is between 1.0 to 2.5, depending on the
material of the back paper.
b) When the sensor detects a label, the Gap Sensor Voltage is between 3.0 to 5.0, depending on the material of the
back paper.
Threshold Voltage
Threshold Voltage or Gap Reference Voltage enables the senor to determine whether it is a label or gap. It is computed
as follow:
Threshold Voltage = (highest detected value + lowest detected value) / 2
Portion on the label with Gap Sensor Voltage above Threshold Voltage is considered as label. And portion below the
Threshold Voltage is considered as gap. Threshold Voltage is computed automatically when [FEED] key is pressed. It can
also manually adjust using P7 and P8 preset key.
Label Gap
Sensor
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