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Print Quality Problems
78
P1039498-001 GC420t™ User Guide 8/15/2011
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 11 in the Getting Started section.
• The printer needs to be calibrated. Refer to the two-flash sequence of Feed Button Modes
on page 84 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 74.
• 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 22 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 84 to print this label.
- User Guide 1
- GC420t™ 1
- FCC Compliance Statement 4
- Environmental Management 4
- About This Document 5
- Who Should Use This Document 6
- Contacts 7
- Document Conventions 8
- Contents 9
- Introduction 13
- GC420t™ Thermal Printers 14
- What’s in the Box? 15
- Your Printer 16
- Opening the printer 16
- Printer Features 17
- Operator Controls 18
- Power Switch 18
- Feed Button 19
- Status Light 19
- Closing the printer 20
- Getting Started 21
- Attaching Power 22
- Preparing Media 23
- Loading Roll Media 24
- Under Media 26
- Loading Transfer Ribbon 27
- Ethernet 33
- Interface Cable Requirements 34
- USB Interface Requirements 35
- Serial Communications 36
- Note • Early models of Zebra 37
- Serial Cable 37
- Parallel Port 38
- Print Operations 43
- Thermal Printing 44
- Modes of Printing 45
- Print Media Types 45
- Adding a New Transfer Ribbon 47
- Adjusting the Print Width 48
- Adjusting the Print Quality 48
- Media Sensing 49
- When to Use Ribbon 50
- Coated Side of Ribbon 50
- Ribbon Test with Adhesive 51
- Ribbon Scratch Test 51
- Printing on Fan-Fold Media 52
- 5. Close the top cover 53
- Fonts and Your Printer 55
- Stand Alone Printing 57
- Sending Files to the Printer 58
- Print Meter 58
- Printer Options 59
- Label Dispenser Option 60
- 4. Close the dispenser door 62
- Cutter Option 63
- ZebraNet 67
- ~WL command 68
- KDU — Printer Accessory 69
- < Max. Current 70
- Maintenance 73
- Cleaning 74
- Cleaning the Printhead 75
- Media Path Considerations 76
- Sensor Cleaning 77
- Platen Bearings 78
- Other Printer Maintenance 80
- Replacing the Printhead 81
- Troubleshooting 85
- Status Light Descriptions 86
- No print on the label 89
- ^MN command in 90
- O and Q commands in the EPL 90
- Print Quality Problems 91
- Manual Calibration 92
- Recalibration 93
- Communications Diagnostics 94
- Feed Button Modes 96
- Appendix: Interface Wiring 99
- Parallel Interface 101
- Ethernet Interface 102
- Serial Port Interface 103
- Appendix: Dimensions 105
- All dimensions are 106
- Optional: Label Dispenser 107
- Optional: Cutter 107
- Appendix: ZPL 109
- Configuration 109
- Command Name Description 115
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