MFC-L3770CDW FAQs & Troubleshooting MFC-L3770CDW Not your product? Sort by: Updated Date Popularity 2 Results 1. 06/13/2017 My Brother machine is dialing the wrong number or is not dialing the number I entered or I receive a busy signal or recording when trying to send faxes. 2. 09/19/2014 Why doesn't my Brother machine have a dial tone? Telephone FAQs & Troubleshooting