User guide

103
Troubleshooting
Print Quality Problems
1/10/06 170PAX4 User Guide 57516L-002 Rev. A
Printing too light or
too dark over the
entire label
Media or ribbon is not designed
for high-speed operation.
Replace supplies with those recommended for
high-speed operation.
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.
You are using ribbon with
direct thermal media.
Direct thermal media does not require ribbon. To
check if you are using direct thermal media,
perform the label scratch test in When to Use
Ribbon on page 29.
If you are using ribbon intentionally with direct
thermal media, increase the darkness level, but
note that high darkness levels may decrease
printhead life. You may wish to perform the
FEED Self Test on page 111 to determine the
ideal darkness setting.
Incorrect or uneven printhead
pressure.
Set the pressure to the minimum needed. See
Printhead Pressure Adjustment on page 92.
Smudge marks on
labels
Media or ribbon is not designed
for high-speed operation.
Replace supplies with those recommended for
high-speed operation.
Misregistration/skips
labels
The print engine is not
calibrated.
Recalibrate the print engine.
Improper label format. Use correct label format.
Misregistration and
misprint of one to
three labels
The platen roller is dirty. See Clean the Printhead and Platen Roller
on page 89.
Media does not meet
specifications.
Use media that meets specifications.
Vertical drift in
top-of-form position
Normal tolerances of
mechanical parts and
print engine modes.
Note • A vertical drift of
± 4 to 6 dot rows
(approximately 0.5 mm)
is within normal
tolerances.
1. Calibrate the print engine.
2. Adjust the label top position setting. See
Adjust Label Top Position on page 74.
The print engine is out of
calibration.
Recalibrate the print engine.
The platen roller is dirty. See Clean the Printhead and Platen Roller
on page 89.
Table 12 • Print Quality Problems (Continued)
Problem Possible Cause Recommended Solution