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Check if supply is loaded
correctly.
Reload the supply.
Ribbon and media are
incompatible.
Change the ribbon or label
combination.
Check if dust or adhesives are
accumulated on the print head.
Clean the print head.
Check if print density is set
properly.
Adjust the print density and print
speed.
Check print head test pattern if
head element is damaged.
Run printer self-test and check
the print head test pattern if
there is dot missing in the
pattern.