Print Quality Problems
86
P1032729-003 Rev. A GT800™ Thermal Transfer Printer User Guide 9/30/2014
There are long tracks of missing print (blank vertical lines) on
several labels.
• The printhead is dirty. Clean the printhead.
• The printhead elements are damaged.
The printing does not start at the top of the label or misprinting of
one to three labels.
• The media may not be threaded correctly. Follow the instructions for Loading Roll
Media on page 12 in the Getting Started section.
• The printer needs to be calibrated. Refer to the two-flash sequence of Feed Button
Modes on page 92 in this section.
• ZPL Label Formats - The correct media sensor may not be activated. Manual
calibration selects the media sensing method for the labels being used (refer to the
^MN command in the ZPL Programming Guide).
• ZPL Label Formats - Verify that the Label Top (^LT) command is correctly set for
your application (consult the ZPL Programming Guide).
• EPL Label Formats - The correct media sensor may not be activated for label
dispensing, blackline or notch sensing, or for Gap/Web sensing. Manual calibration
selects the media sensing method for the labels being used (refer to the O and Q
commands in the EPL Programmer’s Guide).
• EPL Label Formats - Verify that the Set Label Length (Q) command is correctly set
for your application (consult the EPL Programmer’s Guide).
A ZPL label format was sent to, but not recognized by, the printer.
• Is the printer in pause mode? If so, press the Feed button.
• If the status LED is on or flashing, refer to What the Status Light is Telling You
on page 82.
• Make sure the data cable is correctly installed.
• A communications problem has occurred. First, make sure that the correct
communications port on the computer is selected. Refer to Connecting your Printer to
a Computer on page 29 in the Getting Started section.
• Verify the correct Format and Control Prefix on the printer match what you are using
in your ZPL programmed label format. The default Format (COMMAND CHAR) is
Caret (^) character and the Control (CONTROL CHAR) is a Tilde (~) character.
Verify the characters with the Configuration Status label printout. Refer to the one-
flash sequence of Feed Button Modes on page 92 to print this label.
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