The printed label contains blank horizontal lines.
There may be some dust on the print head. Clean the print head as follows:
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Turn off the machine's power.
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Open the back cover.
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Remove the tape cassette and the batteries.
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Gently wipe the print head with a dry cotton swab.
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Use the cotton swab to wipe up and down along each roller while rotating them with your finger.
1 Black streak to be cleaned