HL-4570CDWT FAQs & Troubleshooting HL-4570CDWT Not your product? Sort by: Updated Date Popularity 4 Results 1. 08/30/2010 Clean the drum unit 2. 08/30/2010 Clean the inside of the machine 3. 07/06/2010 Clean the paper pick-up roller 4. 07/06/2010 Clean the corona wire Cleaning FAQs & Troubleshooting