When switching between different label types or the printer is not printing correctly on the Zebra GS420T Barcode printer you can reset the printer right at the printer to correct these issues by following these “Flash” commands.
To get into the flash command mode start with the printer power on and top cover closed, press and hold the “Feed” button for several seconds. The green status LED will flash a number of times in sequence. When you release the “Feed” after the specific number of flashes and before the next flash sequence starts, the printer will run the specified function that follows the flash count.
4 Flashes – Factory Defaults – Resets the printer to the factory default settings. This command should be used if the printed label is printing over multiple labels or shifted left or right on the label. It should be run before running the other flash commands.
2 Flashes – Standard Auto Media Calibration – The printer detects and sets the media type and media length, and it adjusts the media sensors for optimal performance with the installed media. The printer will feed one to four labels while calibrating.
7 Flashes – Manual Media Calibration – The printer runs extensive tests to detect and set media type and media length, and then it adjusts the media sensors for optimal performance with the installed media. Manual calibration is recommended whenever you are using pre-printed media, print on the liner or if the printer will not correctly auto calibrate. A graphical profile of the media sensing will print.