User guide
Zebra GK420t User Guide  COBISS System Management 
4/18  © IZUM, 18. 3. 2013, VIF-NA-20-EN, V1.0 
Serial connection 
Figure 8: Serial connection 
The printer comes with a serial and a USB interface. To connect the printer use the appropriate 
cable. 
During installation you can use the drivers available: 
  on CD supplied with your printer, 
  via http://www.zebra.com/id/zebra/na/en/index/products/printers/desktop/gk420t.4.tabs.html, 
  via http://www.seagullscientific.com/downloads/drivers/archive/7.2/7.2/Zebra_7.2.exe, 
To  use  the  printer  from  several  workstations,  it  is  recommended to  connect it only  to  one 
workstation enabling shared use of  the printer to  other workstations. For help,  call +386 (0)2 
2520 333 (Call center) or send an email to cobissservis@izum.si. 
2.3  Cleaning the printhead 
To clean the printhead, use the cleaning pen supplied with your printer containing the cleaning 
solution.  Use  the  cleaning  pen  tip  to  remove  debris  and  dust  that  has  built-up  on  the  heater 
element of the thermal printhead. 
The cleaning pen can be used only once and make sure that you use it only for this purpose. If 
you use it once again, the contaminants from previous uses may damage the printhead. Instead of 
a cleaning pen, you can also use a soft cloth and pure alcohol. 










