You can print a network connection report to check the status between the printer and the wireless router.
Load papers.
Tap 
on the printer's control panel.
Tap General Settings > Network Settings > Connection Check.
The connection check starts.
Tap Print Check Report.
Follow the instructions on the printer's screen to print the network connection report.
If an error has occurred, check the network connection report, and then follow the printed solutions.
Tap Close.