MFC-9120CN FAQs & Troubleshooting MFC-9120CN Not your product? Sort by: Updated Date Popularity 3 Results 1. 01/28/2013 The keys on the control panel do not respond. 2. 08/26/2011 I heard a beep sound from the UPS (Uninterruptible Power Supply) when I turned on my Brother machine. 3. 04/26/2010 The wrong power cord was included with the purchase of my Brother machine. Others FAQs & Troubleshooting