The Zebra GK420D/GX420D/ZD420/ZD421 is a direct thermal label printer that uses thermal labels. As such, it does not require a transfer ribbon.
If your Zebra Label Printer uses transfer ribbon, click HERE.
This printer is used with Barcode Manager in Retailer.
Installing the Printer & Driver
- Open the printer's cover and ensure a label roll is present.
- Close the cover until it clicks in place.
- Make sure the power switch on the back is turned off.
- Connect the power cable to both the printer and a power source.
- Connect the USB cable to both the printer and the computer.
- Note: There may be a sticker covering the USB port on the back of the printer. Remove this to connect the USB cable
- Turn on the power source and then turn on the printer.
- Windows should detect the printer and automatically install its driver. A message box will appear when it is complete.
If you have trouble installing the driver or getting Windows to recognise the printer, you may need to contact a computer technician or the Zebra support team.
Setting Up the Printer Driver
- Once the printer driver is installed, click on the Windows Start button.
- Without clicking anything else, start typing the words Control Panel and click on the Control Panel icon when it appears in the list of results.
- Click the Search Control Panel bar at the top right, type 'Devices and Printers,' and then click on it.
- Right-click the Zebra printer icon, then click Printing Preferences.
Configure the following options:
Speed: 5
Darkness: 27
Paper Format: cm
Width: 5.08
Height: 10.16
- Click Apply.
- Click on the Advanced Setup tab at the top.
Configure the following options:
Top: 0.40 cm

- Click Apply.
- Click on the Calibrate button. The printer will calibrate and print out some blank labels.
- Click OK.
Setting Up Label Printer Settings in Retailer
- On the main screen of Retailer, click on Stock → Barcode Manager.
- Click on the Printer Settings button.
- Under Label Printer Settings, select Print to the Label Printer. Do not use Print to the EZ-2 Label Printer.
- Next to Print to the Label Printer, select your Zebra printer from the drop-down box. If your printer isn't listed, restart Retailer.
- Click on Advanced Settings.
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Configure the options according to the list below:
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Top Margin = 0, Left Margin = 1, Right Margin = 0
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Width = 35, Height = 27
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Move RightAligned Controls = -2
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Font Name = Times New Roman
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Print or Preview = Print
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Printing Page = Print all Labels at once
Pause b/n printing = Adjusts the delay between labels printed on a Zebra label printer when using the Printing pages option: Print one at a time. We suggest setting this to 0.
- Click OK.
- Click OK.