The paper moves through the printer, but nothing appears on the paper.
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Make sure you are using thermal paper.
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The print surface must face the back, when looking from the front of the printer.
1 Print surface
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Check the print density setting in the printer driver’s dialog box, or in the Printer Setting Tool (see Using the Printer Setting Tool). You can change [Print Density] (available settings: 0-10) in the Printer Setting Tool.