DCP-8040 FAQs & Troubleshooting DCP-8040 Not your product? Sort by: Updated Date Popularity 3 Results 1. 28/01/2013 The keys on the control panel do not respond. 2. 26/08/2011 I heard a beep sound from the UPS (Uninterruptible Power Supply) when I turned on my Brother machine. 3. 26/06/2007 Why does my computer become unresponsive when using the USB interface to connect the Brother machine? Others FAQs & Troubleshooting