HL-4070CDW FAQs & Troubleshooting HL-4070CDW Not your product? Sort by: Updated Date Popularity 4 Results 1. 11/07/2022 How do I replace the Belt Unit? 2. 11/07/2022 Replace the drum unit. 3. 07/20/2022 How do I replace the Waste toner box? 4. 02/10/2021 Replace the toner cartridge Video FAQs FAQs & Troubleshooting