DCP-7040 FAQs & Troubleshooting DCP-7040 Not your product? Sort by: Updated Date Popularity 4 Results 1. 10.05.2013 How do I clean the corona wire? 2. 03.06.2009 How do I clean the drum unit? 3. 15.02.2008 How do I clean the laser scanner window? 4. 14.01.2008 How do I clean the scanner to improve the copy quality? Cleaning FAQs & Troubleshooting