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Diagnostics and Troubleshooting
Troubleshooting—Printing Issues
5/22/17 ZT600 Series™ User Guide P1088680-001
Poor Print Quality
Issue Possible Cause Recommended Solution
Smudge marks on
labels
The media or ribbon is not
designed for high-speed
operation.
Replace supplies with those recommended for
high-speed operation. For more information, see
http://www.zebra.com/supplies.
Poor results with thick
labels
The print line is not at an
optimal position for your
media.
Refer to the Maintenance Manual for
instructions on how to adjust the print line for
thick media.
General print quality
issues
The printer is set at the
incorrect print speed.
For optimal print quality, set the print speed to
the lowest possible setting for your application
via control panel, the driver, or the software. You
may want to perform the Optimal Darkness and
Speed Test on page 237 to determine the optimal
settings for your printer.
See PRINT SPEED on page 106 for how to
change the print speed.
You are using an incorrect
combination of labels and
ribbon for your application.
1. Switch to a different type of media or ribbon
to try to find a compatible combination.
2. If necessary, consult your authorized Zebra
reseller or distributor for information and
advice.
The printer is set at an incorrect
darkness level.
For optimal print quality, set the darkness to the
lowest possible setting for your application. You
may want to perform the Optimal Darkness and
Speed Test on page 237 to determine the ideal
darkness setting.
See DARKNESS on page 105 for how to change
the darkness setting.
The printhead is dirty. Clean the printhead and platen roller. See Clean
the Printhead and Platen Roller on page 214.
Incorrect or uneven printhead
pressure.
Set the printhead pressure to the minimum
needed for good print quality. See Adjust the
Printhead Pressure and Toggle Position
on page 198.
The label format is scaling a
font that is not scalable.
Check the label format for font issues.
Angled Gray Lines on Blank Labels
Issue Possible Cause Recommended Solution
Fine, angular gray
lines on blank labels
Wrinkled ribbon. See wrinkled ribbon causes and solutions in
Ribbon Issues on page 252.
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