To fix wireless printer problems in Windows 10, you have to make sure that the printer is properly connected to the wireless network. If you have a printer from along time, you may forget to check if it is connected to the wireless network. If you make the changes in the router ( SSID, Password, Mode), your printer will be no longer connected to the network.
All you need is to take a printout of Network Configuration Sheet. There is usually a menu option or button that allows you to print the current status of the network. If you see the IP address such as 169.254.x .x, your printer is not connected to the internet. So, add the printer manually and complete the configuration to connect it to the network.