Datasheet

44895L Rev. 3 3/15/04 S400/S600 Maintenance Manual Page 4-7
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Inconsistent print quality such as voids in the bar codes or graphics may indicate a dirty
printhead. For optimum performance, the printhead should be cleaned regularly with a
swab soaked in 90% isopropyl alcohol and 10% distilled water. This cleaning procedure is
the best thing you can do to maintain consistent, high quality printing.
Zebra recommends performing the cleaning procedure when installing a new roll of
ribbon, when installing a new roll of direct thermal media, or after having printed 500 feet
(150 m) of continuous or fanfold media.
It is not necessary to turn the power off prior to cleaning. If the power is turned off, all label
formats, images, and parameter settings stored in RAM will be lost. Permanent parameter
settings stored in Flash memory will be retained. When power is turned back on, it may
be necessary to reload some information items into the printer’s memory.