5 Quick Fixes for Most Zebra Thermal Printer Issues

Here are the top five methods that usually work for me when working on a variety of Zebra label printers – from the GK420 and GX420 series to the bigger 110xi and M4 printers.

Step 1: power reset

Switch the printer off using the switch at the back near the power socket. Give it two seconds, then switch it back on.

Step 2: reset to factory defaults

Hold down the single round button on the front panel. The indicator light will start a flash sequence: 1, 1-2, 1-2-3, and so on. When it flashes four times, release it. This resets the printer to factory defaults. See my other post for detailed information about factory resetting.

Step 3: Label width calibration

Hold down the button until the light flashes five times, then release it. This will make the printer enter label width calibration. It will print a series of widths, getting wider each time, on a label. When the printed width matches the label width (or your preferred setting), tap the button once to lock it in.

Step 4: All other calibrations

Hold down the button until it flashes twice, then release it. This will run an automatic set of calibrations

How to Factory Reset a Zebra GK420 Label Printer

M_GK420T_O_A2_128_F-500x500Here is how to factory reset a Zebra GK420t Label Printer by using using the form feed button and holding it in for 4 sequences of flashing numbers.

Press and hold the Form Feed until the 4th sequence of blinks has completed. Each sequence is separated by a 1 second pause.

Factory Defaults

Resets the printer to the factory default settings (equivalent to ZPL command^JUN). Some configuration settings are not returned to their initial ‘out of box’ settings. Other settings are exclusively set, viewed and controlled by programming are also reset. The performs a standard media calibration and then a memory defragmentation routine.

Once the printer has entered the Factory Default mode, the status light will turn amber for three (3) seconds. During that time you may do two things: Do nothing and the printer will reset the factory defaults automatically as described above OR press and hold the feed button to enter a factory default reset modes for printers with a network (Ethernet, Wi-Fi or Bluetooth) printer option (equivalent ZPL command ^JUF). Releasing the button after the first flash resets the network factory options only (equivalent ZPL command ^JUN). Releasing the button after the second flash sequence (two flashes) will reset the printer defaults only. Releasing the button after the third flash sequence (three flashes) will reset both printer and network settings (equivalent ZPL commands ^JUN and ^JUF)