Hi! My name is ***** ***** I'm happy to help!
I'm assuming that the connection is wireless. If you changed your WIFI password, that password ***** be updated in the printer or it won't connect. Follow the instructions on this page to setup the printer on your wireless router using the new security settings: http://support.brother.com/g/b/faqlist.aspx?c=au&lang=en&prod=mfcl2703dw_as&ftype3=2041