Zebra Technologies Troubleshooting Zebra Printer Light Codes: Red Light Blinking and Calibration for GC420t

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Status Light Error Resolutions

Status Light Error Resolutions

The following Status Error Light Resolution numbers correspond to the Status Light Description table on the previous page. Each error number may have one or more resolution to correct that error listed.

1.The printer is not receiving power.

Have you turned on the printer power?

Check power connections from the wall outlet to the power supply, and from the power supply to the printer. See Attaching Power on page 10.

Disconnect the printer from the wall outlet for 30 seconds and then reconnect the printer to the wall outlet.

2.The printer is on and in an idle state.

No action necessary.

3.The printer has failed its power on self test (POST).

If this error occurs right after you turn on the printer, contact an authorized reseller for assistance. When the printer is operating normally, the printer status light will be amber for about 10 seconds before turning green (solid or blinking).

There is a memory error.

If this error occurs after you have been printing, turn the printer power off and on, and then resume printing.

The printhead needs to cool down.

If this error continues, turn the printer power off for five minutes or more, and then turn on. If the amber light persists, then the printer requires service.

4.The printer is receiving data.

As soon as all of the data has been received, the status LED will turn green and the printer will automatically resume operation.

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GC420t™ User Guide

P1052686-001

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Contents Zebra GC420t P1052686-001 GC420t User Guide 22/2012 Iii FCC Compliance Statement About This Document ContentsHow This Document Is Organized Who Should Use This DocumentMail Back Technical Library ContactsIcons Used Document ConventionsContents Print Operations Appendix Dimensions P1052686-001 GC420t User Guide 22/2012 Introduction GC420t Thermal Printers Unpack and Inspect the Printer What’s in the Box?Opening the printer Your PrinterPrinter Features Operator Controls Power Switch Status Light Feed ButtonClosing the printer Getting Started ContentsAttaching Power Preparing Media Loading Roll MediaPlacing the Roll in the Media Compartment Loading Roll Media Guides Loading Transfer Ribbon Loading Transfer Ribbon Loading Transfer Ribbon Loading Transfer Ribbon Printing a Test Printer Configuration Label Pre-install Windows Printer Drivers Serial Port and Windows operating systems Universal Serial Bus USB Device CommunicationsInterface Cable Requirements Connecting your Printer to a ComputerUSB Interface Requirements Autobaud Serial CommunicationsEPL Y Command Parallel Port After Your Printer is Connected Testing Communications by PrintingAfter Your Printer is Connected Print Operations Long Term Printer In-activity or Storage Determining Printer ConfigurationThermal Printing Print Media Types Modes of PrintingTypes of Media Roll and Fanfold Media Determining Thermal Media Types Replacing SuppliesAdding a New Transfer Ribbon Adjusting the Print Quality Adjusting the Print WidthReplacing a Partially Used Transfer Ribbon Media Sensing Ribbon Overview When to Use RibbonCoated Side of Ribbon Ribbon Scratch Test Ribbon Test with AdhesivePrinting on Fan-Fold Media Printing on Fan-Fold Media Externally Mounted Roll Media Considerations Printing with Externally Mounted Roll MediaLocalizing the Printer with Code Pages Fonts and Your PrinterZPL Fonts Identifying Fonts in Your PrinterStand Alone Printing Sending Files to the Printer Print Meter Printer Options XA MMP XZ Label Dispenser OptionLabel Dispenser Option Label Dispenser Option Zebra KDU Printer Accessory KDU Plus Printer Accessory ZBI 2.0 Zebra Basic Interpreter ZBI 2.0 Zebra Basic Interpreter Maintenance See Cleaning the Printhead on CleaningCleaning the Printhead Media Path Considerations Sensor Cleaning Platen Cleaning and Replacement Maintenance Other Printer Maintenance Replacing the Printhead Maintenance Unplug both bundles of printhead wires from their connectors Maintenance Troubleshooting Status Light Descriptions Status Light Error Resolutions Printhead is open Printhead is over temperatureMedia is out Ribbon is outNo print on the label Print Quality ProblemsPrinted image does not look right Print Quality Problems Is the printer in pause mode? If so, press the Feed button Manual Calibration Printing a Configuration Label Troubleshooting TestsRecalibration Communications Diagnostics Resetting the Factory Default ValuesCommunications Diagnostics Flash Sequence Action Feed Button ModesPower On Modes Feed Button Modes Appendix Interface Wiring Universal Serial Bus USB Interface Host Parallel InterfaceSerial Port Interface Connecting the Printer to a DCE DeviceAppendix Dimensions External GC420t Printer Dimensions Optional Label Dispenser External GC420t Printer Dimensions Appendix ZPL Configuration ZPL Printer Configuration Format Managing the ZPL Printer ConfigurationConfiguration Label Printout ZPL Configuration Status to Command Cross-referenceDefault 65536k.......B only displays this if installed ZPL Programming for Memory Management Printer Memory Management and Related Status Reports~WC Printer Memory Management and Related Status Reports