Citizen Systems Line Thermal Printer CT-S601 - Manual (Page 28)

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Set the paper thickness selection lever to the thickness of the paper. (Thick
paper can only be used with the label-printing model)
To get the best print quality, do not change the factory settings unless printing
on thick paper or there is a problem with the print density.
1. Turn off the power.
2. Press the cover open lever.
3. Open the paper cover.
4. Set the paper thickness selection lever to A for thick paper or B for regular paper.
Gently press on the side of the lever with a pointed object, such as a pen, to
move the paper thickness selection lever.
3.8 Setting Paper Thickness
Refer to 1.3 Model Classification
Paper thickness
selection lever
A: Thick paper 85
μm - 150 μm
B: Regular paper 65
μm - 85 μm (Factory setting)