Zebra Technologies GC420d Benutzerhandbuch

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Print Quality Problems
64
P1052685-001
GC420d™ User Guide
5/23/2012
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 foLoading Roll Media
 in the Getting Started section.
• The printer needs to be calibrated.  Refer to the two-flash sequence of Feed Button Modes
 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
• 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
 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
 to print this label.