（1） Ensure the printer is powered off during daily
maintenance;
（2）Do not touch the surface of the print head with
your hands or with metal objects, and do not scratch
the surface of the print head, roller or sensor with
tweezers;
（3）Do not wipe the print head and roller with gasoline,
propanol or other organic solvents;
（4） After the alcohol has evaporated completely, turn
on the power and continue printing.
Print head
21
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