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Check if the USB printer is plugged into an AC outlet.
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Check if the USB printer is firmly connected to your iPad via a USB cable to your iPad's lightning port
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Make sure there’s a roll of thermal receipt paper in the printer.
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Turn your device completely off and then back on.
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Turn your receipt printer off and unplug all cables. Plug all cables back in and turn the receipt printer on.
- Power cycle iPad. Turn it off and on