Datamax-O'Neil RL3_4 User Guide - Manual (Page 40)

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If print quality declines (symptoms include non-compliant bar codes, print dropouts, and streaks)
the typical cause is debris build-up on the printhead. Furthermore, when the build-up is not
removed it may lead to reduced service life or printhead failure. Streaks in printed labels usually
indicate a dirty or faulty printhead.
To clean the printhead (using Datamax-O’Neil cleaning card):

The following procedure is for “standard configuration” printers. Linerless printers should only be
cleaned with the Datamax-O’Neil Cleaning Pens.
1) Open the printer Cover. Remove any media installed in the printer. Open the External Media Door
located in the bottom of the printer.
 External Media Door
2) Remove the cleaning card from its package. Insert the cleaning card through the External Media
Door and into the printer as shown:
 Cleaning Card