MFC-8890DW FAQs & Troubleshooting MFC-8890DW Not your product? Sort by: Updated Date Popularity 3 Results 1. 01/28/2013 The keys on the control panel do not respond. 2. 11/15/2011 Why do the lights in my room flicker when the Brother machine is warming up or printing? 3. 08/26/2011 I heard a beep sound from the UPS (Uninterruptible Power Supply) when I turned on my Brother machine. Others FAQs & Troubleshooting