Citizen CL-S400DT User Manual page 23

Chapter 2 Printer Operation
Setting the Media
Adjusting the Reflective sensor
(p.47)
2 Then, regulate the position of the upper sensor so that the
upper sensor marker scale indicates the same value as the
scale of the bottom sensor scale.
<In case the position of the bottom sensor scale is 3.5>
When using media that is 4 inches wide, position the upper
sensor and the bottom sensor all the way to the right (cover
open lever side).
 When using a reflective sensor
Adjust the position of the sensor so that the reflective sensor
marker of the bottom sensor is at the center of the black mark
of the media as shown below.
Black mark
Bottom sensor
23
Set it to the same value as
the bottom sensor scale.
Align at the center
of the black mark
Black mark
Media
Front Re ective sensor marker