3. Holds the Carriage Line Sensor
The Carriage Line Sensor (also known as the ZIM Sensor) is located on the right of the printer and
is used to detect the edges of the paper to determine the paper dimensions and start position. This
sensor is also the tool used to detect the position of printed lines to perform calibrations (Paper
Advance calibration and printhead alignment).
The Line Sensor is a reflective tool that generates a beam of LED light, whose reflection is detected
by a luminance sensor. The signal from this sensor is used to determine the position of lines or
paper edge according to the position of the Carriage.
NOTE: Both LED emitter and receiver sensor inside the line sensor are protected by a
transparent plastic cover. If this cover becomes dirty, the signal to detect edges or lines will be
affected, which could cause intermittent issues during the paper load.
It can also detect printed lines from short signals when the sensor crosses the lines:
26 Chapter 1 Printer fundamentals ENWW
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