MFC-7840W FAQs & Troubleshooting MFC-7840W Not your product? Sort by: Updated Date Popularity 3 Results 1. 17/01/2014 How do I clear paper jams inside the machine? 2. 14/01/2008 How do I clear paper jams inside the drum unit and toner cartridge assembly? 3. 14/01/2008 How do I clear paper jams at the back of the machine? Paper Feed / Paper Jam FAQs & Troubleshooting