HL-4040CDN FAQs & Troubleshooting HL-4040CDN Not your product? Sort by: Updated Date Popularity 4 Results 1. 07/11/2022 How do I replace the Belt Unit? 2. 07/11/2022 Replace the drum unit. 3. 20/07/2022 How do I replace the Waste toner box? 4. 10/02/2021 Replace the toner cartridge Video FAQs FAQs & Troubleshooting