You can print a network connection report to check the status between the printer and the wireless router.
If you want to configure settings on a printer with Lock Setting enabled, you must log in as an administrator.
If 
is displayed on the printer screen, tap this icon and log in as an administrator.
Select Settings on the home screen.
Select General Settings > Network Settings > Connection Check.
The connection check starts.
Follow the instructions as the diagnostic results are displayed on the screen.
If an error has occurred, print the network connection report, and then follow the printed solutions.