Zebra GC420t User's Guide download pdf (Page 83)

Maintenance

Replacing the Printhead

8/15/2011 GC420t™ User Guide P1039498-001

6. Unplug both bundles of printhead wires from their connectors.

Replacing the Printhead

The new print head comes with the clip and ground screw attached.

1. Align the printhead and bracket to plug the left and right connectors into the black and

white wire bundles.

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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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Zebra GC420t User's Guide Page 83

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