Reseat USB cable plugged into the printer
If issue still persists
Swap printer with register 1 printer
If printer works
Final Step Also note printer was swapped to register 1
If printer still doesn't work
Between 7am and 7 pm:
Final Step
Outside those hours
Final Step
In receipt paper box there will be a cleaning pad
Open cleaning pad
Insert cleaning pad where paper comes out of printer, exposing about half inch of cleaning pad
Close printer
Pull cleaning pad out of printer (do not open printer)
Open printer
Repeat pulling cleaning pad out of printer 4 to 5 more times
If issue still persists
Swap printer with register 1 printer
Final Step Also note printer was swapped to register 1