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PX4i and PX6i High Performance Printer User Guide 97
Adjusting the Label Stop Sensor
The label stop/black mark sensor (LSS) is a photoelectric sensor that controls the
printer’s media feed by detecting gaps between labels, or slots or black marks in
continuous stock, depending on the printer’s media type setup. The LSS must be
aligned with the gaps, slots, or black marks. If you are using irregularly shaped
labels, align the LSS with the front tips of the labels.
The LSS can be moved laterally from the inner edge of the media path to 50 mm
(1.96 in) outward, which corresponds to the center line of full width media. One
part of the sensor is on the upper media guide and the other part of the sensor is
under the lower guide.
To adjust the LSS
1. Use a slotted screwdriver to turn the adjustment screw.
• Rotate the screw clockwise to move the sensor toward the center section.
• Rotate the screw counterclockwise to move the sensor outward, away from the
center section.
2. Look at the print mechanism from the front with the printhead lifted to make
sure that the point of detection on the upper sensor is aligned with the center of
the slots or marks in the media.
Note: You can also use the markings, spaced at 1 cm (0.39 in) intervals, on the lower guide
plate. This method can be especially useful for black marks. Be sure to measure the
lateral position of the black marks with a ruler before loading the media.
Upper part of LSS
Detection slots
Adjustment
screw