MFC-8640D FAQs & Troubleshooting MFC-8640D Not your product? Sort by: Updated Date Popularity 5 Results 1. 12/19/2022 Can I use non-Brother or third party supplies with the Brother machine? 2. 03/25/2016 What is the difference between the toner cartridge and the drum unit? 3. 03/19/2012 Replace the drum unit. 4. 03/19/2012 Replace the toner cartridge. 5. 03/10/2009 Can I buy any MICR toner? Consumables / Paper / Accessories FAQs & Troubleshooting