MFC-620CN FAQs & Troubleshooting MFC-620CN Not your product? Sort by: Updated Date Popularity 3 Results 1. 28/01/2013 The keys on the control panel do not respond. 2. 21/10/2010 How do I clear Machine Error 46? 3. 26/06/2007 Why does my computer become unresponsive when using the USB interface to connect the Brother machine? Others FAQs & Troubleshooting