The baud rate of the printer must match that of the host device Read More>

Ensure the printhead is properly closed and latched.

The print head should be cleaned after every five rolls of media (or more often, if needed) The print elements are located in the thin gray line on the print head. Use the supplied cleaning pen or 99.7% isopropyl alcohol on a cotton swab to clean the print elements from end to end. One may need to put the printer in 'hex dump' mode to diagnose label formatting issues.

If the printer receives an invalid label format it may not print.

The battery needs to be charged Read More>.

If communications is via the serial port, the baud rate of the host device needs to match that of the printer Read More>.

The media needs to be 'direct thermal' Read More>.

For best print quality insure verify the quality of the media being used.

The battery needs to be fully charged to insure proper print quality.

The printhead should be cleaned after every five rolls of media (or more often, if needed) The print elements are located in the thin gray line on the printhead.

To ensure print quality make sure the print head is clean.

The QLn Series Printer is a native ZPL printer and may require a different setup for the darkness and print quality.

The Tone command is recommend if it is available in your printer model. The Contrast command is an older command that is still available in newer printers to make them backward compatible. Setting or changing the Print Darkness can be done using the Tone or Contrast command in CPCL.

Symptoms addressed by this solution include Adjusting the quality of the printed image.Print Quality Adjustments and ConfigurationsĬommunication with printer and ability to send files/commands to the printers Read More>īelow are some basic troubleshooting steps to help resolve print quality issues in CPCL enabled Zebra Mobile Printers

Zebra zd420 printer error lights