HL-2140 FAQs & Troubleshooting HL-2140 Not your product? Sort by: Updated Date Popularity 2 Results 1. 01/20/2014 My Printer starts warming up in Sleep mode. What can I do? 2. 08/26/2011 I heard a beep sound from the UPS (Uninterruptible Power Supply) when I turned on my Brother machine. Others FAQs & Troubleshooting