Fujitsu FP-510II - 8-3. Cleaning the Thermal Head

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(5) After completing cleaning, reposition the roll paper, and close
the top cover.
Caution: Take care not to dent or otherwise damage the platen roller.
A dent on the platen roller may result in incomplete printing or
line feed errors.
Caution: Each time that the FEED switch is pressed, the platen roller is
rotated by 1/12 of a turn.