Dell C1760nw

Im having problems connecting my printer to the wifi.  It used to work fine and the printer is right next to the wireless router. Now when scanning for networks it no longer finds the router next to it. It only sees and connects to a router much further away which I use as a backup.

The router it connects to is old compared to the one it no longer connects to. 

Anyone have any thoughts on how I can resolve the matter

Thanks in advance