MFC-660CN FAQs & Troubleshooting MFC-660CN Not your product? Sort by: Updated Date Popularity 3 Results 1. 16/09/2014 I am experiencing problems sending a fax. 2. 16/09/2014 I am using Voice Over Internet Protocol (VoIP) and I'm having problems sending faxes. 3. 16/03/2012 The rainbow cursor keeps spinning when I click on Copy/PC-FAX in ControlCenter2 (For Mac OS X 10.7). More FAQs Fax FAQs & Troubleshooting