DCP-9042CDN FAQs & Troubleshooting DCP-9042CDN Not your product? Sort by: Updated Date Popularity 4 Results 1. 29/01/2014 How do I clean the drum unit? 2. 22/08/2007 How do I clean the laser scanner windows? 3. 10/07/2007 How do I clean the scanner to improve the copy quality? 4. 29/03/2007 How do I clean the corona wires? Cleaning FAQs & Troubleshooting