User guide
Zebra GK420t User Guide  COBISS System Management 
ii  © IZUM, 18. 3. 2013, VIF-NA-20-EN, V1.0 
FIGURES 
Figure 1: Back side of the printer.................................................................................................... 1 
Figure 2: Front side of the printer ................................................................................................... 1 
Figure 3: Opening the printer .......................................................................................................... 2 
Figure 4: Closing the printer ........................................................................................................... 2 
Figure 5: Printhead .......................................................................................................................... 2 
Figure 6: Connecting to power supply ............................................................................................ 3 
Figure 7: USB connection ............................................................................................................... 3 
Figure 8: Serial connection ............................................................................................................. 4 
Figure 9: Cleaning the printhead ..................................................................................................... 5 
Figure 10 : Opening the printer and placing the media roll ............................................................ 5 
Figure 11 : Pushing the media under the media guides .................................................................. 6 
Figure 12 : Loading black ribbon cartridge .................................................................................... 6 
Figure 13 : Final loading of the black ribbon cartridge .................................................................. 7 
Figure 14 : Selecting the right model (GK420t) ............................................................................. 9 
Figure 15 : Selecting the right software package with drivers for GK420t .................................. 10 
Figure 16 : Control Panel with Devices and Printers .................................................................... 11 
Figure 17 : Printing settings .......................................................................................................... 11 
Figure 18 : Advance printing settings ........................................................................................... 12 
Figure 19 : Colour dithering......................................................................................................... 12 
Figure 20 : COBISS3 user interface ............................................................................................. 13 
Figure 21 : Local destinations editor............................................................................................. 13 
Figure 22 : Setting local destinations ............................................................................................ 14 
Figure 23 : Detailed settings ......................................................................................................... 14 
Figure 24 : Refreshing settings in the COBISS3 user interface .................................................... 15 
Figure 25 : Setting the printer ....................................................................................................... 16 
Figure 26 : Sending factory settings ............................................................................................. 16 
Figure 27 : Printer settings ............................................................................................................ 17 
Figure 28 : Media calibration ........................................................................................................ 18 
TABLES 
Table 1: Status light ........................................................................................................................ 8 










