Citizen CL-S6621 Technical Manual page 23

Operation of Each Mechanism
Detecting continuous media: (Media Sensor menu: "None")
For detecting continuous media, only the reflective sensor is used. In this case, only media end is
detected by the reflective sensor.
LED light amount control:
According to the media selected by the Media Sensor menu ("See Through", "Reflect", or "None"),
the amount of light is well controlled to detect the label/U-shaped notch, black mark, or continuous
media. The amount of light is as follows (the largest amount is for "See Through):
• Continuous media (None) < Black mark (Reflect) < Label/U-shaped notch (See Through)
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CL-S6621