HL-4000CN FAQs & Troubleshooting HL-4000CN Not your product? Sort by: Updated Date Popularity 3 Results 1. 08/26/2011 I heard a beep sound from the UPS (Uninterruptible Power Supply) when I turned on my Brother machine. 2. 08/24/2006 The printer has power problems. What should I do? 3. 03/16/2006 The machine does not print anything. Others FAQs & Troubleshooting