Zebra G series desktop printers use flash codes to perform certain functions, such as calibrating or printing a configuration label. This is a list of the flash codes and their function.
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. The explanation shows what happens when you release the key after the start specific number of flashes and before the next flash sequence starts.
Source: Zebra G Series User GuideLearn more about this topic at scansource.com >