Citizen CT-S801 Type II Mode D'emploi page 21

 Paper damper
Assists paper feed.
The components in the figure below are used in label-printing models and black
mark models.
Paper damper stopper
 Paper damper stopper
Used to lock the paper damper.
 Black mark sensor
Detects black marks on black mark paper.
The sensor position is either M1 or M2, depending on the model
classification.
 Label sensor
Measures the length of label paper.
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Label sensor
V10 CONSUMIBLES S.L.
Black mark sensor (M1)
Label sensor
Black mark sensor (M2)
Refer to 1.3 Model Classification
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