HL-4000CN FAQs & Troubleshooting HL-4000CN Not your product? Sort by: Updated Date Popularity 3 Results 1. 16/11/2015 I heard a beep sound from the UPS (Uninterruptible Power Supply) when I turned on my Brother machine. 2. 16/01/2006 The machine does not print anything. 3. 09/12/2005 The printer has power problems. More FAQs Others FAQs & Troubleshooting