Canon PIXMA MG4200 Series On-Screen Manual page 767

Note
If the Bonjour service name or MAC address of your scanner or printer is displayed in gray or not
displayed, or cannot be selected, check the following conditions and click OK to close the screen,
then reopen it and select your scanner or printer.
- ScanGear (scanner driver) is installed
- Network settings of your scanner or printer is completed after installing ScanGear
- Network communication between your scanner or printer and computer is enabled
If your scanner or printer is still not displayed, see "Problems with Network Communication."
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