MFC-820CW FAQs & Troubleshooting MFC-820CW Not your product? Sort by: Updated Date Popularity 3 Results 1. 08/05/2013 The keys on the control panel do not respond. 2. 28/09/2012 How do I clear Machine Error 46? 3. 07/04/2006 My computer hangs when connect with a USB Cable. More FAQs Others FAQs & Troubleshooting